Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 12AX7 on November 15, 2011, 03:15:11 pm

Title: Judge roy bean tone stack?
Post by: 12AX7 on November 15, 2011, 03:15:11 pm

Read a thread about this tone stack at the AX84 forum from 2009 and it sounded like the ultimate TMB replacement. everyone all excited about it, but i have not read anything about it other than that. Was this just a passing phase that turned out not to be as great as first thought or what? Has anyone tried this or read anything else about it?

Title: Re: Judge roy bean tone stack?
Post by: sluckey on November 15, 2011, 03:27:49 pm

I don't have any info about a jrb tonestack, but just hearing the mention of the Judge brings back fond memories of a favorite hangout across the bay. Judge Roy Bean's had a lot of famous players and was a great place to hang out. Too sad it burned down.

http://www.buffettnews.com/2005/02/15/7103/ (http://www.buffettnews.com/2005/02/15/7103/)

Title: Re: Judge roy bean tone stack?
Post by: thelonious on February 16, 2012, 11:09:29 pm

Figured it was worth it to resurrect this thread since there seems to be comparatively little info out there about the JRB stack. I recently tried it in a homebrew amp because I wasn't happy with the results I was getting from either a TMB stack or a single tone control.

I think the original ax84 thread 12AX7 referred to is http://www.ax84.com/index.php/bbs/dm.php?thread=394074 (http://www.ax84.com/index.php/bbs/dm.php?thread=394074). The schematic is at http://www.freewebs.com/balijukka/roybeanstack.htm (http://www.freewebs.com/balijukka/roybeanstack.htm). Also, the first post in this thread does a much better job explaining the stack than I could do: http://www.ax84.com/bbs/dm.php?thread=401590 (http://www.ax84.com/bbs/dm.php?thread=401590). I "ditto" everything Danhei says there---the JRB stack is very flexible, the controls are intentionally interactive, it's utterly different from a TMB stack and requires experimentation, and one of its strengths is that it can provide either a sweepable mid notch or a slight mid hump depending on settings.

What I can say is that for me, in this amp, it was the answer to my tone stack woes. I love it. YMMV, of course, and you will certainly need to do some research and experimentation to figure out which resistors to include (or not) in your application. Some of the info is confusing in that regard.

Title: Re: Judge roy bean tone stack?
Post by: bruno on February 17, 2012, 04:47:52 am

That sort of reminds me of the wide panel 5D6 bassman tonestack... could be wrong though!