Ac 30 modification question

[barnoyle]

CAN an AC30 be modified to USE THE TB CHANNEL AS AN EXTRA GAIN STAGE?...IOW CAN THE AMP CURCUIT BE altered to just have 1 (ONE) CHANNEL?...I Understand that the CUT CONTROL can be parralelled with a cap (RESISTOR)?... to make IT a MASTER VOLUME CONTROL...ANY IDEAS?

[Bruce / Mission Amps]

CAN an AC30 be modified to USE THE TB CHANNEL AS AN EXTRA GAIN STAGE?...IOW CAN THE AMP CURCUIT BE altered to just have 1 (ONE) CHANNEL?...I Understand that the CUT CONTROL can be parralelled with a cap (RESISTOR)?... to make IT a MASTER VOLUME CONTROL...ANY IDEAS?

Yeah, three.
1. Think about getting a different amp
2. Use a clean boost pedal
3. See #1

[Tubenit]

Interesting idea. IF I were to attempt it, I'd try something like this.

I built a Double C amp a while back that sounded good to me. Maybe you could adapt the OD to the Vox AC30 idea.

Double C amp - Hoffman Ampifiers Guitar Tube amp forum

I presume this is NOT a vintage amp? IF it is, leave it original.

With respect, Tubenit

[Bruce / Mission Amps]

Wow! Those poor cathode biased EL84s must get the crap beat out of them with all that gain!

[barnoyle]

OH no...this is one of the 1st amps I built back when Doug Hoffman started his web site long ago (geez aging sucks don't it/)...anyway ...no trem.../ reverb...I got nice new "bundle" IRON from TRIODE / CHAD...GREAT TONE!...SO...skies the limit I guess...frank.

[barnoyle]

it sounds really killer with my modified DOD FX86B ...AND A "MK4.23 in front of that thru the normal channel where I'm loving the 4.7 uf bypass cap...frank.

[Tubenit]

Wow! Those poor cathode biased EL84s must get the crap beat out of them with all that gain!

Well you have the "normal" clean AC30 channel going into essentially a single stage of gain (given the CF doesn't add much) that is controlled by both a trim and level pot. You could easily use a 5751, or a 12AY7 or a 12AV7 there without a problem.

And one could simply add a PPIMV after the LTPI (if needed) and before the power amp and get reasonable and controllable gain, IMO. So then you'd have a trim, level and PPIMV to protect the poor EL84 tubes.



With respect, Tubenit

[barnoyle]

I do prefer pre phaseinverter MV over POST...COOL

[barnoyle]

HOLY CRACK...just to change the subject really quik...I just added the NEW "COBALT" ERNIe BALL STRINGS TO MY PAUL...WOW!...they are sweet!...10 guage.