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Post subject: for blues deluxe ri owners...
Posted: Sat Aug 21, 2010 4:55 pm
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why did you buy this amp? maybe the same reasons i did ....it's clean and simple. you likely did the same tthings i did. change the tubes (several times) to get that "tone" or saturation. you likely changed the speaker too. rebiased the amp with every tube change ..set it up off the floor turned and twisted the controls and so on. you like the thing but it just needs something. am i hitting home? ok, i ended up like this...tubes gt fst pre amp tubes , sovtek 6l6wxt+ power tubes and a jensen p12n. after all that i love the sound but......hay wait a minute it lacks compression. real compression like a 57 deluxe. you CAN'T get that from a solidstate rectifier. i did the next best thing pulled an old compressor pedal from the depths of storage (when i say old we're talking DOD fx80b circa '87) and put it in the effects loop. fiddled with the knobs and damn there it is that sound i sort of was looking for. it even helped with the volume problems(always too loud)the dynamics changed and you can turn the guitar up and there's the "angry sweaty pig" and turn it down and it is clear and still punchy. i'll probably take a lot of flack for this but it works. i run it on o.d. channel and set the controls to b6, t8 ,mid9, gain 8, pres3, mast4 rev to taste. i use a strat with 57/62 pups. give it a try you will be suprised at what comes out of the amp. if only fender would be a little more intrested in THAT SOUND and not production numbers and put a tube rectifier in these amps( rectifier tubes are cheap and theres less in that type of circuit than a solidstate one. thanks for reading...good luck.


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Posted: Sun Aug 22, 2010 10:36 am
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You can read my thread here:

http://www.fender.com/community/forums/ ... hp?t=43020

I haven't changed speakers, not sure if I am going to now. I am looking at getting a compressor, though.

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Posted: Sun Aug 22, 2010 11:48 am
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hey bluesky636, i read your thread the other day. sorry if it came across a little condecending didn't know about the e.e. degree. sometimes you hear from folks that don't understand electricity. i've been an electrician for nearly 20 yrs. glad you like the j.j.'s i thought about trying them but read that they sound Marshally. is it true? when you get a compressor pedal get one that has level, eq, attack and compression. some don't. i find it makes the whole amp more responsive if you have more control. try it on the clean channel too.....it's a real nice sound(lower the bass to 3 and dime the mids and about 9 on treb. clean vol at 9).


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Posted: Sun Aug 22, 2010 12:53 pm
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No problem.

It has been a long time since I have heard a Marshall. All I can say is that the JJs sound really good in the amp.

I just won a used Boss CS-3 on E-bay ($60.00 including shipping). I'll see how that sounds.

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Posted: Sun Aug 22, 2010 2:32 pm
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GZ34 rectifier (e.g. Telefunken) exibited a "dynamic" resistor of 30 to 100 Ohms if my memory is not totally gazy (inverse of d_i_forward/d_u_forward). May be by adding a resisor on the solid state, we can recover the "sag". I never did it, but as I'm not the first to think about that, may be some of you did it and can say if the "sag" is recreated.

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Posted: Sun Aug 22, 2010 3:10 pm
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bluesky636 congrats on the score, try the level at jst under half and the attack at 10 o'clock and the comp at half or just under and eq where you like, it's a cool pedal hope it works out like i believe it will just put it in the loop. tissan how can you get the parts and can you get a schematic for it's location or some info. on placement? i would be willing to try it in my bdri after i see more info. they have kits we can install for the 40 watt type amps to convert to tube rectifier and they only cost around 60 bucks. just don't know if we have the room for it. you know it looks like fender would use something like that to keep the sound and feel. blues players need that. i think this loss of real compression is the cure to the hot rod deluxe as well.


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Posted: Sun Aug 22, 2010 3:45 pm
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blackstrat71 wrote:
bluesky636 congrats on the score, try the level at jst under half and the attack at 10 o'clock and the comp at half or just under and eq where you like, it's a cool pedal hope it works out like i believe it will just put it in the loop. tissan how can you get the parts and can you get a schematic for it's location or some info. on placement? i would be willing to try it in my bdri after i see more info. they have kits we can install for the 40 watt type amps to convert to tube rectifier and they only cost around 60 bucks. just don't know if we have the room for it. you know it looks like fender would use something like that to keep the sound and feel. blues players need that. i think this loss of real compression is the cure to the hot rod deluxe as well.


Thanks. I will keep those settings in mind. After I use it stock for a while, I will probably install one of Monte Allums' mod kits. I installed his H2O Plus mod in my Boss Blues Driver and love it.

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Posted: Mon Aug 23, 2010 5:19 am
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blackstrat71,

I've never experienced such modification.

I will investigate on the mod you are talking about to put a valve rectifier on BDRI.

However, it is difficult to use directly a rectifier valve on BDRI, the difficulty will be with DC voltage, generally with rectifier valve it's half AC wave (equivalent of 2 diodes with common kathodes and a transformer middle point connected to the ground and earth) since with solid state it's full wave using a "greatz bridge" (no need of middle point). For the same AC, Greatz bridge gives double voltage. The filement heating has also to be taken into account due to the fact that it is on kathode.


About other ideas

First we have to measure the current in order to calculate the power of the resistor. A BDRI is consuming 400W max, neglegting filement and opamp supplies, it's rougly 450V - 0.9A . With rougly a RMS 1A and 10V for sag --> the resisor should be 10 Ohms 10W!!!!! (for permanent reliability) and able to withstand suddent current pick.


Some example of 7ender amp W and W/O valve rectifer.

http://support.fender.com/schematics/gu ... 20JUN%2007).pdf
http://support.fender.com/schematics/gu ... ematic.pdf


Don't make wild modification until you are sure it can work. On top of that such amplifier has "high" DC voltage that can be dangerous.
Take care.

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Posted: Mon Aug 23, 2010 6:46 am
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There's quite a bit of difference between your two schematics. Not just SS versus tube rectification. Like the power tubes, type of biasing, type of phase inverter. One amp has SS parts in signal path, the other doesn't, etc. It would be quite a bit of work to use the 5Y3GT rectifier in the Blues Deluxe. Prolly would arc...

Anyhow, I find that the 5U4GB works really nice in two-6L6GC amps. Better than some GZ34 rectified amps. You get a bit more sag & the cost of good NOS 5U4GB's are quite a bit less than Mullard or GE/Sylvania made GZ34/5AR4. If I were to swap out a tube rectifier for the SS one, I'd tried to pattern the modification after an amp which used a 5U4GB stock. Like some Bandmasters.


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Post subject: I did none of that stuff
Posted: Mon Aug 23, 2010 4:10 pm
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I hated my bdri for about a year it was just to loud! I fond here on the forum some had a little volume box (e bay for $20) that you put in to the effects loop. WOW! I have the amp vol. at 7 or 8 and with this vol box I can now turn the volume down and still get a killer tone. I play in bars a lot .Not a night goes by some one doesn't come up and look at my amp or tells what great sound I get out of, not my playing just my sound, sigh! One thing is I do play thru a lot of stomp boxs, compressor equaliser giga 20 Vox wha Keely Blues driver,Chorus.. Tuff amp,never had a problem with it. The killer sound is just that it will kill you trying to get it....Tanks and aloha!!Mark


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Post subject:
Posted: Tue Aug 24, 2010 1:59 pm
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Sorry, put valve rectifier is not an easy mod on BDRI since the power transformer is not foreseen for that. :?

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Post subject:
Posted: Tue Aug 24, 2010 2:23 pm
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yeh, i saw the mod and don't think i'll be changing anything. i don't believe there's enough room for the tube for starters. i'm now in the process of building my own "57 deluxe" clone. there's enough schematics on line. i'm going to start totaly from scratch. the parts are cheap and i have the skills so........


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Post subject:
Posted: Sun Aug 29, 2010 9:47 am
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Make it with eyelets and Jensen speaker. What kind of wood you wanna take?

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