5c1 Choke Question

[plumcrazyfx]

So I've been playing with my build a bit more and would like just a bit more firm bass response do I'm thinking of adding a choke and upgrading the tube to an EL34 (while moving to a Hammond 125GSE).  I also have a ton of old RCA 6GB6Gs that I want to be able to use with an adaptor.  I'm thinking if I add the choke between the first 2 caps (in place of the 500ohm resistor) I will be running the whole supply through the choke.  What rating will I need for the choke? The EL34 datasheet I have says max signal current of 221ma.  Am I reading that right?

[sluckey]

I's use a 4H to 10H choke rated for 100mA.

[PRR]

> EL34 datasheet I have says max signal current of 221ma.  Am I reading that right?

That sounds like a TWO tube MAX output condition.

The Fender 5C1 is one little 6V6 running ~~37mA, prolly 40-45mA counting G2 and small bottles.

If you have not changed from 5C1 OT and PT, any other power tube (6GB6, EL34) should be biased pretty-near where Fender set the 6V6. Say 40-43mA cathode, 50mA whole amplifier. (But do think about the higher heater consumption of the bigger bottles.) 

The 100mA suggested is fine, *even* if you have up-sized OT/PT to "6L6 Champ" levels, (4K 10W OT, 100mA PT). If you really want to run the big bottles near 6V6 power level, you could use less.

[plumcrazyfx]

Yah, that was under the Class AB1 push pull when I looked at it again.

[drgonzonm]

I suspect you may want to increase the size of your OT.   I have a rickenbacker M8e that won't allow me to play bass through it.  (Yes, I know its not designed for bass, its designed for a Hawaiian  guitar ).   The OT is tiny, and an SE amp, but by design, it related to 5C1, (like humans and ringtailed monkeys, primates).

I hope you're not throwing good money after bad results.  If you're experimenting to learn, then bad results are a reasonable choice of spending time and money. 

[kagliostro]

First of all, have you tried to increase the filter capacitors value ?


Franco

[plumcrazyfx]

I'm planning on moving to a larger power transformer, a 25w Hammond 125GSE output transformer, and a choke.  I plan on moving the first cap to a 30uf, and the other 2 to a 20uf while also adding one to the preamp supply.  Right now after some testing I'm leaning toward a KT66 and a 5AR4.  My plan is to be able to use a wide variety of tubes with it.