Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: phsyconoodler on December 07, 2012, 02:29:30 pm

Title: bill m coupling cap choices
Post by: phsyconoodler on December 07, 2012, 02:29:30 pm

I lost my sheet with all the Bill m mods on it,and I can't remember what he used for mid and bass caps?
I think it was .015uf and .1uf but my memory needs jogging.
 and did he change the slope resistor?

 Wow! I used to remember everything! :dontknow:

Title: Re: bill m coupling cap choices
Post by: phsyconoodler on December 07, 2012, 08:06:54 pm

I ended up using a .015uf mid cap and a .1uf bass cap and the tone stack mod.It really helped the tone.
I dropped the bias back on the power tubes from -10.5v to -13.5v and it sounds pretty good.More clean headroom and more articulate note separation.More bass and less fart.I also doubled the first filter cap.
  A new speaker and a larger OT would be the ticket to bring the lowly blues jr to life the rest of the way.