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Post subject: Re: VIBRO KING QUESTION
Posted: Tue Jun 10, 2014 1:45 pm
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example of the rotary function (not the orange one it's between guitar and first pre - rollo no like that

i like to drive it a bit after a pre

http://www.ceriatone.com/images/layoutP ... Brulee.jpg

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Post subject: Re: VIBRO KING QUESTION
Posted: Tue Jun 10, 2014 8:10 pm
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quickie...holy crap i created a beast i just did a quick test and heard my wife screaming (nothing new when i test) but i didn't realize she was flopping around on the ceiling fan....19' away and it is.

i made some minor changes and many tests (bypass caps verses ohmic changes at R68 tomorrow i put up numbers after i test one more thing with the complainer on the mainland...

she married me cuz i could play but didn't know geek/nerd came with the package

i am very happy because the VK sound is there..but sweetened and it can sneak up and get ya..now (and can be dialed in for arena or bedroom easy -choose one but not the other

i like that

tomorrow - i have to crash now

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Post subject: Re: VIBRO KING QUESTION
Posted: Wed Jun 11, 2014 11:06 am
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OK new findings

the 888 (aged 1K 2W CC) in place of 100K (Tim C calls for 840 ohm) of course the headroom suffers and it becomes a killer at 5ish with a tele...

in deference to the old timer retired admiral (89 and special) who is on island with family (closest neighbor) so i am not cranking it for a long test i can annoy him by flipping him USAF crap

BUT over 7 or so i get a slow motorboating so i will track down where i induced that

but i am using tung sol ri biased at 44.7ma or so after an hour of warm up -no signal - i will try various bias setting when i calm it back down -i read 475.6 (orange B+) Plate to Cathodes on the 6l6's were 474.1 basically both read the same (matched from tube store)

but i tell ya the character of the the amp is king all the way -last change i made was to a 390pf at the treble spot

but i wasn't motorboating cuz my 40 watt inductive 4.7 ohm load was starting to smell :shock: i like that

BUT here is a finding to ponder and consider and the school is out on that if i change and add more resistance between stages like 20K or so....i'll slam a sub box in it in a few minutes.

suffice it to say at 5 it with a tele is hopping and full of FAT tones with a TELE

albeit a good one

if i plug the LP in it's going to blow at 3

BUT what happened was and i now this from too many years of op amp s in avionics...

i had caps around the 100K (r68) because and i have a great pic of it there is quite a phase shift through the resistor...various caps started pulling it in phase from

+26 degrees out of phase and less amplitude than when i got them in phase across the resistor

i got it down to less than a degree pos and neg. (100K + 680Pf)

so from 26 deg to less than one

and the signal amplitude showed it and the fidelity was great at the levels it should be

so if you are cranking at 3 with a byrdland doing sweet chordal things

clear and sweet crank it....wowser


so i am going to hunt down the oscillation, compensate the the r68 am not sure about the 888 i have in there

it DID without caps bring the phase in less than a degree (so tim C's 840 ohms is putting the phase $@!& in the dirt) from non compensated (100k original resistor) at the 100mv coming in and pots at 12 i was seeing 750mv or so but when i compensated or added the 888 ohm non compensated i picked up about 60 more MV

i have it all written down and am organizing and recapping

but you are slamming the power section...there is where you can dial in the slam (can you tell i tuned many webers before)

and i tested at 1k and 12Khz for checking on effects nebulous cuz if you breathe on a tone pot your baseline is lost

the network after V4 does intrigue me pair r/c tee connections almost...but there was significant phase distortion but flat all the way past 15K

but the .1 is giving me righteous tone in place of it...current a mallory is living there until more caps swim over MAY compensate the vol pot with a 120pf or 47 or or or

so i am going to add a 250k pot where R68 is find a good bedroom (840 ohm) amp sound...damn put a switch in it and do the bedroom resistor and out on the stage the the other (with compensation for either)...(same with PI feed cap .022, .01. 001 are all possible with ...their various +-

but tonality wise when at 7 just before i lose the amp

the tone is awesome best can be described as fat, full and a back note of power that is implied in each note

with a tele blessed with abby's this would be a great gigging sound for blues and country once i get the damn thing calmed back down

i need to toss the LP but i'll spy on the admiral or go tell him i am testing for an hour...

i gotta bet that the LP will destroy the amp at 4-3

and i don't need that i need about 5.5. 6

but it is invitingly sweet and fat with the tele - really like the sound but STILL MUST test LP and i am using ZERO pedals

So for all of you

using the 250K post i will go though the range and report on the freq response effects and or gain (current) to the PI

i gotta think that around 30K ohm or so that will be bingo (for my needs) and it's PTP al can be put back to ....before Rollo

so off to it - later

stay tuned i gotta tame it down

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Post subject: Re: VIBRO KING QUESTION
Posted: Wed Jun 11, 2014 7:05 pm
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OK spent time with it....

the value of r68 varies current if you vary it and i dialed it up nice and pretty on the scope nice symmetry etc final setting TBD but as i increased current to the PI the gain changed little but the waveform became deadly accurate (it would have if i measured it but i was scoping the .047's i'll mess with that later but noticed an oscillation and shouldn't be on that one leg (.1 in the pi) which was caused by a solder joint again (so much for soldering quickies)

the issue i HAD is solder joint have another to chase down...quickie tap and tag wires are the worst way to do it ...do a solid connection or chase demons when tweaking

but you know that

motorboating due to the hammering and lack of bias so i will fix that and report and do more testing and sound checks because i was sounding freaking fata and sweet

anyway but when scoping all sorts of things because an i gotta reiterate

i live in RF hell

i have retired swabbies with hams that emit lighting, long, short wires...if i could see though a few feet of forest i'm looking at a submarine and electronics warfare simulator site and growlers that tag it from time to time or equipped choppers. boat and boeing RF etc

so all sorts of crap can happen but settles down at night

so i have a 3.07hz oscillation extremely low on "X" shows up good. slammed another 47uf on X and things are cool

getting rid of the chicago caps and doing F&T/sprague should have done that first kicking up the wattage of the 6v6 supply resistors R401/r70 and i'll kick up R66 also 1w going to 2+W after rechecking it

measured the other day a plate to cath on the 6V6 451.9 and 12.19+vdc on the top of the cathode resistor 329 ohms i am running 16W on the 6v6 WTH? a @35ma idle ????

anyone else running them the hot? my 6g15 runs much cooler

anyway, so tonight back at if for awhile and then i sit on it

now a grid resistor a 840K - 1M and grid stop on v4B


i want to definitively determine a cap values for the area after V4

the .1 spews warmth and it hits at 4 on the knob with good fresh pres -JUST starts to fold at 4 with the .1 replacing the network

soundwise i like it best....but i need to do further testing and deal with the 3 hz thing when i order next

checked for currents in the metal....VERY clean unlike some i have looked at stable no "things" popping on the plane.

OK

so i am getting real close to saying good because as i said i am keeping the VK sound but opening it up a bit without big cap changes and so forth for ME, my Ears...and VK

i am goung to do an ODS HRM in it but scamming the vibrato space...can be put back stock so why not.

so

few more test to do settle on a configuration then record some sound clips

but i can tell you if you want a cleaner amp at 4+ don't use the .1 (but i is a single coil bedroom amp right now...before further calming of the beast the .1 but unstable above 6..and that will be fixed in a few minutes (friend is coming over with some resistors to add to the fray (or should i say browwow from his collection...yes he collects resistors like i do tubes and chips



more on that when i have measurements

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Post subject: Re: VIBRO KING QUESTION
Posted: Thu Jun 12, 2014 10:25 am
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Tone is incredible but regrouping to let things sink in

the network that was there bothers me

even though it had phase delays through it it was flat...as a coupling circuit (after V4a) i looked at other zinky stuff and they have that thing in one form or another

BUT calculators and all sorts of stuff say i am on the right path

(right now i speak of the r68 and V4a changes)

the sound tests made a teles sweet but i could get ice pick if needed, and the other types of pickups sound great but the LP kills it too soon

I have some biz stuff to do so i'll get back to it in a few days and tabulate graph my findings and

here is where i am at (just the network and v4a) is that - tone is killing it and balls are there it is starting to roll over at 4 (great for a house amp) and the sound i can best describe as a deluxe reverb (old one) at about 5-7 but with more implied the sound (6L6) BUT....

it's not flat....like the zinkey circuit was but it choked the amp -so the trick for me now is to

look deep into the anals(yes) of my early 70's tube training and remember blocking and motorboating etc...

so i'll get all that settled


but i am of the opinion i need to spice up a flat network like that is OPEN and not so choked

wuith the .1 with a 470K/1M resistor tied to ground ....get good full bandwidth sound but i would like to try to attain that with a flat response -

SO

that .47 on V4B might go calc's show 22uf would open it up....so

i will do a bunch of testing over the next few days and weekend and settle on some stuff to spew...

but right now it is killing it but rolls over at 4 i am shooting for 5-6 on the vol pot

but the network bothers me - i remember techniques like that from the ancient memory cells and i need beer to wake them up- later

PS i do wanna hip you experimenter's up (i have been in datacenter last too many years o i am getting back to tube stuff again) since the later 70's early 80's only changed tubes until about 5 years ago...so it's all back to square one for me...

so i have been studying up on stuff for my audiophile solid sate stuff

google

ac mains dc blocking and go read up...interesting because when i was teaching comp sci in prison the computer i had and the institution's were swamping the trannys with backfeed...years ago so ...many things had to be done but one of the things was a level of DC being on the mains (not good for trannys)...(i have had one power tranny blow the one on the telephone pole) because of DC so i am going to look into this ....

the other is the ole inductor remover (virtual inductor)....but i have seen them used in front of them..

so look at this (forgetting the caps on the right side)

Gyrator-based active smoothing filter

http://tinkeringken.blogspot.com/2011_0 ... chive.html

not for me now i wanna get the king....sounding like it does...a few more clicks up the dial i need more that 4...but DAMN it sounds good

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Post subject: Re: VIBRO KING QUESTION
Posted: Thu Jun 12, 2014 8:55 pm
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Bwahahahah :mrgreen:

i knew i wasn't too brain dead yet....inspite of neurologists and my wife....

remember i started this thread because i have been worrying the net after the V4a and i wasn't inclined to do all Tim C mods or do them because it's a VK and i want to keep the character and open it up though (you charater-open it up) yeah it's a tight butted thang that needs a few beers to really rock

and that is great for arena and places you can pedal up and go low or guitar, cord, and solid mains....power and clarity ..immediacy

all the hi fi terms yeah we heard it all and i can tell you because i am where i can crank it the hell up.....it's a fine cranking amp...sucks at bedrooms levels yet we want to have a full spectrum...but at lower volumes BUT be able to hire a trucking company to move it to a stage and ....bedroom doesn't cut it...

and many things have been tried and i have some to add to the fray once i compile and ..make my case...

Cr filter the OLD CR filter (rc filter you say...sort of) zinky has a brick wall here albeit flat normally a great thing....but to me it scoops mids (but i'm brain dead) and takes life from the signal unless it's move fat electrons at higher settings of volume

i sAid phase delays or he was leading lagging the phase.....like we did old school in radar for quickie delays or make up time (seymour Cray was notorious for this and other techniques to tune his busses and control lines

It came to me pouring a honey do dictated pad of concrete this afternoon and ...boom it hit me

two pole Cr filter...it can be used to lead or lag...commonly a high pass element ( i have been doing these for years in op amps and it never hit me talk about brain death)

i will publish the calc'd values ...his originals and attempts to fatten it up but be a brick wall at the low end (below 82Hz) low E ot adding in harmonics above and below fC

when looking at damping factors, the bode plots and other considerations i think...some of us like the ugly fi that our fave supers and DR and other things throw down

i have calc'd out similar curves damping a Q quality but at different Fc's and i evaluated where i was but lamenting the lack of equal amplitude across the spectrum (best as can be with the configuration as is) i am a single coil guy mostly but must have LP/Byrd and other humbucking capability

tomorrow unfortunately the war beast is working from home and not be vacating the island

so ...i will do a few inductive load test on scope and things....

come up with a couple and test as i can this weekend but next week i can crank the piss out of it....

but if ya want bedroom vol.....01, slam a 250K or so and or series resistance to quash a little current into V-4b

and you are FAT at 4 with a tele


but we don't want that....

stay tuned i am an uber nerd/geek responsible for a piece of audio gear many of you and your kids for sure enjoy


would'a made it better BUT

beancounters ya know
in an X sort of way

no bean counter messing with the VK like a spider monkey flicking your ears......they (beancounters) are annoying little spider moneys


coyote food (only if it flicks my damn ears) they love garlic

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Post subject: Re: VIBRO KING QUESTION
Posted: Sat Jun 14, 2014 12:40 pm
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:shock:
Well thing have been tried mathematically and by ear...

the ear stuff is just starting but my birthday is today so they are yanking me to Port townsend for killer mex....and the ferry ride can be a blast....little do the thousands of tourist that take that ferry that PT is next to the largest weapons depository on the west cost...boomerville (poseidon's etc) (i asked for Jaco....fat chance)

VK STUFF
Ok its a CR filter so i went here http://sim.okawa-denshi.jp/en/CRCRtool.php

and used the cr high pass filter and plugged in both of Zinky's values and a third i have to find he uses that circuit in a couple of ways

you can see using the calc that he has a (put the freq sweep to 82hz to 15K (pushing 15K but 82 is the low E before harmonics 15K is usually not needed for guitar (harmonics though is another thing)

so he does
R1 470K C1 .22u
r2 470K C2 .0068 ( the early king used .0022)

hit calculate after turning of the sweep and you see the nyquist ..

Center freq is 8.75Hz (low low)
Q .165
Damping 3.019
Tr -.023S you can see the transient in the waveform display for it

so i spent some hours loading common value of what i have on the island so i have tried a few curves and am now experimenting with 5 to test the idea is to kill 60hz but to also open up the filter without a FET....but i am thinking inductor additions...i have some tunables from my A&M days

all have a similar curve but one looks promising in opening up the amp more...and it moves the Cf around a bit he's trying to kill 60hz and low crap coming in the loop and from the reverb etc...noble idea but the amp is choked as many feel...(depends it can open up fine cranked and the interactive as hell tone knobs are dialed in )

i watched the output going to the PI coupling cap as i swung the treble pot through it's range and the volume rises as i sweep but then drops off (WTH?)....and the mid pot and treb pot are the hard workers

now i have not changed the 150Pf tone cap and i am injecting the signal on the loop in...i suspect a 250/390 will open up the top end and let in more low end i AM for no reason going to try a 47P bypass the volume pot once i fart with the tone (fatten it up)

i did from the front end also but for electrical testing of the network i am injecting 100mv. zero offset and 1Khz 10K and others as needed like when i swept his original by the thousand hz his circuit to get the curve of it....wrote it all out will put up...

this looks good it is sharper cut off and has more gain...but we'll see tonight or tomorrow if i survive my 61st.

i will say that with the good tubes and so forth the king has a very good signal all the way to the loop and after V4B...nice fidelity with little distortion until...and the PI rolls over interestingly more on that

we'll get that thing opened up -

suggestions?
next

470K .1
250k .22

is looking good but i need to open it up more but i am trying this first today and then the others


Fc 3.13HZ
Q .247
DR 2.01 .076S Overshoot (more than above) but it's a different set of values i have tried a few but one has a perfect phase response and looks good to try after i try the combination above

Stay tuned and if you come up with a good curve lay it on me and i'll test it

i am thinking one cap and a resistor but i think he is using two poles to get the curve tighter and severe below 80hz

i have done a few things and kept a list

one is a 100 ohms off the tone stack to ground in place of the ground connection, .1 around all 25uf's (may or may not stay...will test later) i used 10K RN65 1%MF for the input resistors the 1meg is a 1W MF all resistors that are 1/4w will be one watt CF all 100K's MF 2W and all 1M MF (typically the higher the resistance the more thermal noise so using metal films helps quell thermal induced noise, in the 1W/ 1/4 i am dispersion h current through a larger entity and therefore the thermal noise will lesson provided i use good resistors. 716's everywhere still have two to buy, F&T + sprague power...and sprague oil filled on the 25Uf's

the .47 bypass on the V4b i have left and i have lifted ...and i am going to try a 4.7uf i have

i'll study that more

I put a 10K MF on the input at the loop in series after the 1M (hi Z is gone but the 10K is working fine) i will test more with effects in place quiescent with and without resistor and post results

390pf for the mix cap (i have that in my 6g15 works nice)

,1 across the bass pot outer terminals (bridged to wiper)

http://www.ampbooks.com/home/amplifier- ... capacitor/

set up as V4b W/.47uf
29.88dB at 82Hz
59.21 @ 10Khz

same with 4.7uf Kb
53.29 @ 82
59.26 @ 10K gonna hear 60hz more on this fer sure...but i'll try anyway

so it will pump things up a bit

Heck when ya plug in 22uf holy moly but i just flipped a few numbers in the calc

and try 150K at the plate 2.2 on kath and 25uf

22 is flatter...quite a boost (keeping that in the back of my mind)

right now r68 is set to 100K its now a pot wired as a rheostat

PI in perfect balance with the 10k pot
Bias balanced right at 44.7 each after one hour warm up

SO cool is i can put it ll back to stock if i wish...but NO NO

ODS next for that empty space over the vibrato circuit (why stick a pedal in frnt (buffer maybe)...

geetar, cord front end..loop but built in ODS might be nice and i am doing mine with an HRM and on the HRM instead of 33k, 56k 82, 92K or 100K OR 125K

a pot instead so i can dial in exactly what i want for a spanning resistor and since it is a marshall stack i typically like 56K thereabouts...

we'll see like i said before i will switch it in at the foot switch for vibrato

just google Dumble ODS or dumble HRM and you can see what i am talking about

mine is coming into play using the 24V fender relays like the supersonics have (gold contacts inside and an audio not a power relay i have my layout nice and tight and will shoot pics when it's laid out small and square easy to put in.

should be a nice effect when i dal in the ODS

many opinions out there on settings and or values through the gain stage

time will tell

but first the damn network needs to fatten up and still quell 60/50hz


you can see his curves intersting

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Post subject: Re: VIBRO KING QUESTION
Posted: Sat Jun 14, 2014 1:02 pm
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Could all this loquaciousness have been caused by exposure to Agent Orange?

Hmm......

:wink:

Arjay

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Post subject: Re: VIBRO KING QUESTION
Posted: Sat Jun 14, 2014 10:33 pm
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Don't know about that, maybe that sea air. But, being one to lust after a VK for years, I give these threads a read. I've tried to get close with the 2X10 Bassman combo(864) & ext 1X10 cab, with the Weber 5G15 reverb . Just a working man's set-up. I'm no stranger to personal component adjustments. But IMHO the totem is still: Speakers, Tubes, Bias, Caps, Resistors, Wire.... Oh Yeah, the cab!! Art

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Post subject: Re: VIBRO KING QUESTION
Posted: Sun Jun 15, 2014 10:01 am
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oh yeah the cab ...let me tell you about the best cab i have ever heard and millions...have been heard (exaggerating) that has one 12

think this

1" hand rubbed walnut cab and the idiotic thing is it's best piece is on the bottom an incredible piece 12" worn in Celestion Gold and now the zinger....not a birch baffle but one that is tight grain cedar and finished as good as any high end furniture i have seen sanded counter sunk holes for the speaker/baffle to amp attachment bolts for god's sake. so the baffle projects and adds a ton to the tone a nice adjunct to the anico spkr. eye shaped open back

the baffle is about 3/4" thick maybe a tad thinner

http://www.redjonesamplification.com/

no dudes the amp is great but is choked he has a brick wall there as you can see, so looking at other zinky's i see the power supply is also capable of generating the relay voltage i need since this board s shared with the tonemaster so i am all over the tone master as i hear Lindsey plead to bomb iraq on CNN...fender gens up 29volts for relay switching of the channels etc in the tonemaster

i am going to investigate the tranny's...y(no need for the brick wall or less of one needed

jensen or the swedish trannies might work i have a set of incredible audio trannys 60k/10k - 600 teted -.5dB 1-20K...just kluge them in and listen....for grins


no man the amp IS GREAT as is (new tubes tho) and it BURNS cranked and i can play chet on ita low vol, takes pedals great before the pa or loop as you well know the sho bud pro II sounds good (wallace pup) BUT

i have heard one that has been opened up but the dude used the timC stuff and think that changes the character of the amp too much but it was a nice amp. (buy a super reverb)

naw i am going to mess around in that area, add the relay power to supply the ODS

and make more measurements as i said putting effects in the loop, no input signal look at noise with without 10K loop return...grid stop

but laugh all ya want but if you were sitting where am you might be just chilling like me....i have a 360 degree of ...incredible nature, mountains the sea..and the freaking stink covered faces of the dogs...many interesting smelly things on the beach...and i like to &^%$ it up with the VK ..

naw yep as is if you just recap it with rolled or ps6/716's

run some current through it a week and enjoy a nice sonically clear amp with a nice unaltered sine -to a point...the first sign even with the balanced PI (with pot)...is the PI wether i put in a NOS or a nice ge 5751, 12au7

I can see what he is doing but i think that set of numbers i put up i am going to try should be interesting...and i notice a few things on the tone master that might be a ggas to try

so why the hell not (it can go to stock in an hour and a half)...

i'm ancient, have no real tasks to do until summer is over and ....lots of time

and dudes after working t MSft for 18 years...it's nice to play in the analog world again.

BTW one of my jobs for years was perfomance tuning servers and putting out white papers on findings etc so i am dialed into zoning in front of something and ...spending stupid time on it

but i think when done i will have a king that is opened up but still sounds like a king...

because i have not changed the original values except in the mix cap until tried the first combination of values.

if i can get it close to the .1 but balanced i'll be happy

plus i have to change out the supply caps the 3hz oscillation is coming from the power supply.

BTW, the sea air is nice...the waves were crashing hard at 3am as i stepped out with a stupid schnauzer and listed in the background to porsche/audi battle at le man until the ferrari to a big dump...stopped the race

no guys i have permanet shell shock (3 racing incidents)....

not supposed to track the car anymore but...i ain't dead yet

i could put up the symptoms and disorginazation and jumbled wors is one of them...sucks sometimes

anyway staty tuned and ..lets see if i can do something or not o this

or i'll just put back the stock settings good caps in there for that section. :mrgreen:

i set the bias right on 70% but once i dial in the guts i'll mess with the bias a bit...then record it so you can hear the thing on various pickups

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Post subject: Re: VIBRO KING QUESTION
Posted: Sun Jun 15, 2014 11:22 am
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:mrgreen:
Well now....

yank the network (C5/6 R21-15)

put in a .047/400 and 1watt 1meg from it to ground on the vol pot side of the cap

i can only do limited testing because of weekenders and the admiral is in with the whole can so i don't wanna blast today but tomorrow is a different story

but tomorrow

so initial comment is i stuck in a 1W 1m CF and an old mil spec rolled sprague 400v .047 i will try a mallory and 716 too because it is opened up no 60Hz in the face (loop not tested with effects)

so basically with stock values (except the mix cap)...

and the .047/1m it is opened up a bunch with the tle and abbies (alder / rosewood fingerboard)

now i am trying .0047 and a 470K in place of the 1m

nice and opened up even the slight hum i have is hidden (but has to go..and i just may try a active ripple filter why not) could get stoopid and use a supertex lr8 eh (regulate the rails and bias keeping the ratio for the 12ax7's (not trying it now or on this amp but....i am putting 18W trainwreck back together....might have to test them

tomorrow i will test with the menagerie ...

HOWEVER and do not laugh because i am not....

the damn reverb cable is funk...so i went to my damn strange place the wife's hated space and found a nice new hi-end cable TV box so i stripped off the audio wires and used them in place of the skank on the reverb now...

it opened right up - seriously...not kidding

it was a quick change no controls were touched and we ll agreed it was better

i also ordered up some vibration isolation material to cut and use on my tank to see if i can calm down the springs a bit i also am using a 7025 rca in V1-2, 4 and PI (right now)

damn the amp opened up it can play blues or country

motorboating starts at 8ish and is low level now so i need to track that stage down..

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Post subject: Re: VIBRO KING QUESTION
Posted: Sun Jun 15, 2014 12:05 pm
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Location: Coupeville, WA
:shock:

OK
tried this
Sprague rolled .047 from the line in output at V4A in series with 470K with 470K to ground at the vol pot side that was a damn good setting DAMN DAMN good

so .047uf > 470K+470K to ground then to v4B ( i tried a 100K to ground too much attenuation but i could crank it at full vol and it had it's character BUT

the 470K to ground shunts less...and i will try a 250K in there or a darn pot to dial it in because with the 470K the king indicates it wants to be hurt tomorrow...i like this one i am going to explore around in there now and for sure test the heck out of it tomorrow

then when done with that i go to V4B and possible a 250/390Pf treble with 47P vol bypass or same value as super reverb 120Pf :mrgreen:

summ'n else i noticed as i kicked chassis outta the way

the supersonic 22 tranny's are much larger than the deluxe reverb (power tranny) a good swap perhaps because you can good source of +-12-18Vdc Plus i think more current availibility

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Post subject: Re: VIBRO KING QUESTION
Posted: Sun Jun 15, 2014 5:38 pm
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Is this a blog?


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Post subject: Re: VIBRO KING QUESTION
Posted: Mon Jun 16, 2014 10:23 pm
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nope just a dude with a vk tons of tubes and parts and a crazy friend on another island who builds incredibly toneful amps and i am damn close on the opened up sound with no more than yanking the 2 pole filter and opening it up there and minor additions and i am documenting and testing on an incredible lab environment - cuz i can

because i used the .047 and on the pot side i slapped the old sub box and at 100K the motor boat went away at full dimed knobs ...no crap at all and the amp was BRUTAL but only a few seconds (beach communities hate marshalls and VK's at 10pm) and i hate town marshals too...especially wearing my tee shirt...the party ain't over until you are smiling for the mug shot- our podunk jail SUCKS...

and i had to be real quick lots of vacationers so tomorrow in the day i can fire it up and run a few guitars through it

but with the .047 and a 100K as of tonight that SOB is full of tone, balanced and growls with a tele but i have a few other things to try

because incredible amp...some folk wanted it opened up and i know where it was choked (brick wall)...but i do have a 2 pole curve i want to try similar to bruces but a shaper cut off closer to the target leaving the area around 82hz more pumped up while quelling the freqs below a tighter kne point and moved down a tad...pumping up the low end a tad while knocking out some of the hum

tomorrow i throw it all at them
then i add a little tweak a cat in LA uses

so all i am after is just opening up the amp minimal parts



tomorrow i test and satisfy a feeling i have

once satisfied i will put up the pics, prints and comments but basically stock VK opened up

might have popped a blue frame....so i am in the 2 x V30 mode...until tomorrow when i can check...buzz...not looking good i can drop a 10L in there for some solid back to the note TBD

i reccomend the 716's signal caps .1's around the 22uf/cathode caps (2) .1 across the bass pot (but not all done testing yet), at the moment the .47uf at V4B is disconnected i tried a 4.7u and 22K fat boost there and it worked but i want to spend some time on that area after i get V4a finished.. 100 ohms from the tone stack to ground (replacing the direct to ground connection) and the bias resistors with diodes

that's it so far and it still sounded (the brief ti i could fire it off...like a VK not a super R or twin or anything - but a VK....but not constipated but until i put it on the bench after listening tests i am not killing off the 2 pole (the idea is great but.....

and the other reason i am doing this is for all who don't have killer labs or live where they can crank a stack...but at the correct hours...understandable

i am pleased with the quick test...

still need to order the 1W resistors and new filter caps (i am a experienced believer the sprague or F&T's will improve the P/S (bypass them and the response will improve but man you have to have an educated ear to "hear (feel) it

later - R

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Post subject: Re: VIBRO KING QUESTION
Posted: Tue Jun 17, 2014 9:06 am
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Rollo,

Have you tried replacing the main rectifier diodes with ultra-fast types? Like UF4007 for stock 1N4007? My experience is when done, no bypass caps are need to reduce diode hash.

Cheap to try, anyhow.

http://ampgarage.com/forum/viewtopic.php?t=4088

http://www.mouser.com/ProductDetail/Fai ... BydTRZE%3d


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