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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 6:27 pm
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Go for it! The more original the better.

I'm pretty new to this scene, but already planning my first cabinet build. Have also been reading up on lots of amp building resources. Would love to see some more....and be able to interact with builder.

Thanks!

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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 9:53 pm
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Location: Natural Bridge, Virginia
Chicago-Dave wrote:
Go for it! The more original the better.

I'm pretty new to this scene, but already planning my first cabinet build. Have also been reading up on lots of amp building resources. Would love to see some more....and be able to interact with builder.

Thanks!


Its coming. Just waiting on some back ordered parts. :wink:

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Post subject: Re: Potential New Amp Build Thread
Posted: Wed Feb 06, 2013 9:55 pm
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Location: Natural Bridge, Virginia
shimmilou wrote:
rollo wrote:
...i LEAVE the amp plugged in and OFF (only for amps with digital components) i hook one clip to chassis and the other to the HV caps first the pos side then the neg side...the reason it is a good idea to keep the amp plugged in BUT TURNED OFF in digital equipped amps...is simple..if you lift the wall plug out (meaning removing the grounding/earthing) and do ANY discharges of caps to chassis you will instantaneously raise the chassis to the level that you are discharging......


Not only rude, but ludicrous as well. One side of the caps are connected to chassis (ground) and connecting a resistor from chassis to the positive side of the caps is a short circuit across the caps. Short-circuiting the caps discharges them, not into the chassis, but dissipated as heat through the resistor. Leaving the amp plugged in while discharging caps is insane. :shock:


Please don't encourage him.

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Feb 12, 2013 5:25 pm
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Location: Coupeville, WA
http://www.electronicrepairguide.com/ca ... harge.html

I'll explain the technique as explained by jack darr, the us government, IBM corp and raytheon missiles, USAF dept of energy...simple...but i want to back it with data....me and a bunch of living old dudes have been dissipating the charge and KEEPING it dissipated like that for years...after all...and yes a chassis will instantaneously float to the value of the discharged cap's voltage (provided they are of a high enough potentials)...ONLY troublesome on mixed topology amps..ie tubes and digital, analog stuff...it's that crap that doesn't like seeing their grounds (commons)..pushed to the level of discharge.

and yes amp POWER off and using the...bleeder (temporary) tool..some actually keep theirs connected until after repairs..(the real paranoids) cap memory etc...

anyway..i have much proof...in my original attempt at answering this..but i have a bit of brain damage and do not always get out exactly what i am trying to say...with that said...please wait ... clarification will be forth coming..

crusie through this post - but i have found the goods just have to go now

The "service bleeder" (BTW last time i looked most tube amps have the HV tied to chassis..therfor a service bleeder between the + and - terminals of the HV cap (AMP OFF)...WILL dissapate the power in HEAT...good observation...excatly what you want to do...

http://www.gearslutz.com/board/geekslut ... rcuit.html

A GOOD GENERAL GUIDLINES FOR HV, capacitor memory etc right here


http://euverc.colostate.edu/safetytests ... Manual.pdf

BTW the way we did it in raytheon radar transmitters was with a 1" diameter metal hook, a 4' phenolic rod, an insulated handle with 5 guard rings and a huge wire bolted to the chassis and the hook...and it scared the crap out of my Iranian students...yep (at night no moon...you could get a good 4' arc easy! (expediency of repair is the issue...and that was the way to do it and no resistor required...not so in the jack darr bleeder tool (and every TV repair dude's tool box back in the day)

been using the bleeder tool since 1964 or so..(POWER OFF unplugged ..then bleed tube amp), power off, plugged in POWER REMAINS OFF, discharge using the bleeder..then unplug the power cord and repair (earthing is called earthing for a reason) - for mixed component amps) THEN pull out the power cable..that way..you can prevent "harming" the silicon crap..and yes i will be posting proof..just time limited and time hammered at the moment but will revisit soon....

i ain't dead yet..and i routinely play with high volts exceeding the capabilities of a tube amp...current also...LASER's like POWER and high current....

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Post subject: Re: Potential New Amp Build Thread (discharging caps)
Posted: Tue Feb 12, 2013 6:20 pm
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Pick a poison

http://ampmaker.com/discharging-capacitors-946-0.html

http://www.edaboard.com/thread127412.html

http://www.repairfaq.org/samnew/tvfaq/tvsafdis.htm

http://www.justinholton.com/hotrod/caps_p.html


Grounding primer for newbies or old...builders or repair folks

http://www.celectronics.com/seminar/sam ... 1-9-05.pdf

http://morrow.ece.wisc.edu/ECE230/lessons/grounds.pdf

http://www.ese.upenn.edu/detkin/instrum ... d/grd.html

http://www.eetimes.com/ContentEETimes/D ... f_Ch_5.pdf

for you cats with digital gear, analog gear...ESD can kill your amp, stomp boxes etc depending on, design, conditions, and a host of other stuff...or the guts of your computer if inclined to fix/build/tweak your own machines...good primer right here

http://www.teledyne-api.com/manuals/04786B_ESD.pdf

i KILLED a HIGH END stereo system in Denver merely by walking up to it in winter (high altitude, no humidity...big time static)...and it was plugged in and grounded...your mixed device amp, effect, rack mounter gear et al...can go poof...

now that you have some primer (and the original poster is waiting for amp parts) study up

next...proof that the chassis can float to instantaneous values of discharged voltage/currents..(and your cmos, TTL, analog, uup's, DSP's and "silicon" doesn't like that much!!!)..i mean..IBM and D.O.E can't be wrong??? (or one of the patriot missile system grounding engineers...

with electron microscope images...when i get home...off island for a few days

However, having taught this crap in college, winning voc ed instructor of the year state of Washington...blah blah. Univ of Texas edu award for same...with many flying designs and NONE that have ANYTHING to do with the 787 battery circuits...outsourcing...the bane of Boeing!

AES member - 87096

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Feb 12, 2013 6:45 pm
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Joined: Mon Apr 05, 2010 2:37 pm
Posts: 8708
Location: Natural Bridge, Virginia
Hey Rollo.

Do you not understand how f'ing rude it is to hi-jack another persons thread? What is your problem?

You say that you are close to 60 years old, yet you act and post like some 16 year old poser who just likes to hear himself talk. This forum has a number of professionals who know how to speak and write and who respect each other and other's threads. You might want to pay attention to how things work around here and learn something from the people here.

Well, this thread is dead as far as I am concerned and Rollo has the honor of being the latest addition to my ignore list. Congratulations. :roll:

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Feb 12, 2013 7:38 pm
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bluesky636 wrote:
Hey Rollo.

Do you not understand how f'ing rude it is to hi-jack another persons thread? What is your problem?

You say that you are close to 60 years old, yet you act and post like some 16 year old poser who just likes to hear himself talk. This forum has a number of professionals who know how to speak and write and who respect each other and other's threads. You might want to pay attention to how things work around here and learn something from the people here.

Well, this thread is dead as far as I am concerned and Rollo has the honor of being the latest addition to my ignore list. Congratulations. :roll:


I'm sure you are right..not sure about hijacking not hip to that...but i thought i saw a blurb within this thread on cap discharging..perhaps i am wrong...

Oh an i AM WELL aware of who some of the folk listening in..and posting...as they are of me :mrgreen: ...please do ignore...but i'll hit the rules and look at the hijack crap and figure that out..like my avatar.. :roll: :roll:

those pros may not have had my operation (yet)..and had their brains blown...healing, just have the equiv of shell shock (PPCS) and PTSD all news to me..

so i jumble things at times letters words etc (i try to check for errors but have a PA handle my pro correspondence)

Don't ignore this.... :D
(just make sure to have your neck arteries listened to from age 50 on..or if you have plaque issues) carotid endarectomy (87% blocked and i have eaten like a rabbit since 1/1980...just saying...and you could have one growing too..... :shock: :lol:

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Post subject: Re: Potential New Amp Build Thread
Posted: Tue Feb 12, 2013 9:17 pm
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Geez, where is Vanna White when you need her? Someone needs to buy a clue or two. That would be you Rollo. Based on your reply, you do seemed to be clueless. Doesn't make it any less obnoxious though.

Arterial plaque could lead to poor oxygenation of the brain resulting in pathology or brain damage. My money is on Bill's brain getting plenty of oxygen.

Following ones own advice is recommended.

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Post subject: Re: Potential New Amp Build Thread
Posted: Fri Feb 15, 2013 10:08 am
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modwiz wrote:
Geez, where is Vanna White when you need her? Someone needs to buy a clue or two. That would be you Rollo. Based on your reply, you do seemed to be clueless. Doesn't make it any less obnoxious though.

Arterial plaque could lead to poor oxygenation of the brain resulting in pathology or brain damage. My money is on Bill's brain getting plenty of oxygen.

Following ones own advice is recommended.


"Arterial plaque could lead to poor oxygenation of the brain resulting in pathology or brain damage. My money is on Bill's brain getting plenty of oxygen".

Astute observation and correct i now have a patent applied out for an implant... to prevent. serendipity. Based on the photo..heed my advise next time you are visiting the doc...have the doc listen to those neck arteries!

OK

Trainwreck, attention to detail, parts, loop, minimal components in signal path,Vox AC30 PA....or a Marshall 2x el84 PA...both sound wonderful

and very touch sensitive..the express A01..good start point

boogie had most up to the mark V, fender..all the BF's over the years few silvers...and other amps..none sounded as pure and touch sensitive as the trainwrecks i have played with those PA combo (clones of course)

BTW amp heads out there...find an old Mesa Boogie 22cal or studio 22 and start from there..... or a Rivera 55/12 (90's ver)



i'll be interesting to see what this build becomes...looking forward to it :mrgreen:

gotta go air up my left hemisphere -later

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Post subject: Re: Potential New Amp Build Thread
Posted: Fri Feb 15, 2013 9:05 pm
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Hey Rollo, the OP has left this thread. He was experiencing knucklehead problems in here. A few of us were. The word is knucklehead and not knuckleheads. We aren't talking Harley Davidson's either.

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Post subject: Re: Potential New Amp Build Thread
Posted: Sat Feb 16, 2013 8:07 am
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Prefer Ducati's myself...no HD enemies up here...just ride with them, ..(sometimes i scout ahead)..come and ride the cascade trail or the peninsula...great ride.

stop by the lab... hear some fine amps...

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Post subject: Re: Potential New Amp Build Thread
Posted: Sat Feb 16, 2013 9:38 am
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bluesky636 wrote:
Well, this thread is dead as far as I am concerned and Rollo has the honor of being the latest addition to my ignore list. Congratulations. :roll:

+1.. I've been here 5 minutes and have read enough idiocy for one day.


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