bright cap on the master pot ?

General discussion area for tube amps.

Moderators: pompeiisneaks, Colossal

Post Reply
jamme61
Posts: 212
Joined: Wed Jan 18, 2012 2:20 pm

bright cap on the master pot ?

Post by jamme61 »

I know amps have bright caps on the gain pot, is it a bad idea to use a bright cap on a master pot? I have a CAA pt100, putting a 50pf cap, on the master volume, instead of the gain pot, sounds good to my ears. Is it OK to do this? thanks
User avatar
Reeltarded
Posts: 10189
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: bright cap on the master pot ?

Post by Reeltarded »

Yeah. Fine and dandy and all that junk and stuff.
User avatar
xtian
Posts: 7263
Joined: Mon Apr 19, 2010 8:15 pm
Location: Chico, CA
Contact:

Re: bright cap on the master pot ?

Post by xtian »

I just built a 5c1 with a bright cap across the volume pot, wiper to output. This arrangement works until you max the volume control, then it no longer affects the tone. How can you get a consistent "bright" effect, regardless of volume setting?
I build and repair tube amps. http://amps.monkeymatic.com
surfsup
Posts: 1513
Joined: Mon Nov 29, 2010 12:21 am
Location: Chicagoland

Re: bright cap on the master pot ?

Post by surfsup »

Voice the amp for more highs... ;-)
User avatar
xtian
Posts: 7263
Joined: Mon Apr 19, 2010 8:15 pm
Location: Chico, CA
Contact:

Re: bright cap on the master pot ?

Post by xtian »

surfsup wrote:Voice the amp for more highs... ;-)
I got something for you: ;P
I build and repair tube amps. http://amps.monkeymatic.com
User avatar
Reeltarded
Posts: 10189
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: bright cap on the master pot ?

Post by Reeltarded »

lol!

Fly a 270k off the output of the pot and bypass it with somthing bright.
Gaz
Posts: 1146
Joined: Tue Aug 25, 2009 6:27 am

Re: bright cap on the master pot ?

Post by Gaz »

Sure, Dumbles have a small cap over the master volume sometimes. That sure is a nice amp you have there. You know, John Suhr actually pops up around here sometimes, so maybe he can give his blessing on your mod :)
jamme61
Posts: 212
Joined: Wed Jan 18, 2012 2:20 pm

Re: bright cap on the master pot ?

Post by jamme61 »

Gaz wrote:Sure, Dumbles have a small cap over the master volume sometimes. That sure is a nice amp you have there. You know, John Suhr actually pops up around here sometimes, so maybe he can give his blessing on your mod :)
after playing it, with and without, I kept it stock (john Suhr did it right) I did contact John Suhr about this stuff and he has been great! He helped me out in making a footswitch for the amp and bias stuff, he's a nice guy. I really like this amp. I had to sell an amp and guitar, to buy it used. thanks for the input
User avatar
Reeltarded
Posts: 10189
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: bright cap on the master pot ?

Post by Reeltarded »

He is not only a legend, he's a nice guy and a true genius badass when it comes to all stuff noisy. A real hero in a jungle of zeros. You can tell he loves his work.

+100
jamme61
Posts: 212
Joined: Wed Jan 18, 2012 2:20 pm

Re: bright cap on the master pot ?

Post by jamme61 »

Reeltarded wrote:He is not only a legend, he's a nice guy and a true genius badass when it comes to all stuff noisy. A real hero in a jungle of zeros. You can tell he loves his work.

+100
how did he get so much gain in the pt100 and so little noise? The amp is almost dead quite, even on the high gain channel.. When I opened up the pt100 I was very impressed with everything except, the pots. There's these little tiny ( I think 16mm) alpha pots. They work fine but, I was hoping for better (not a biggie). Love to own a suhr guitar someday.
User avatar
Reeltarded
Posts: 10189
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: bright cap on the master pot ?

Post by Reeltarded »

jamme61 wrote:
how did he get so much gain in the pt100 and so little noise? The amp is almost dead quite, even on the high gain channel.. When I opened up the pt100 I was very impressed with everything except, the pots. There's these little tiny ( I think 16mm) alpha pots. They work fine but, I was hoping for better (not a biggie). Love to own a suhr guitar someday.

I have never seen inside one. Look at the interstage attenuation and the PI.

I love cheap assed Alphas. Only modern pot that actually meets spec, and sturdy too! I ran a couple on plates without any failures. Scary.
Gaz
Posts: 1146
Joined: Tue Aug 25, 2009 6:27 am

Re: bright cap on the master pot ?

Post by Gaz »

jamme61 wrote:how did he get so much gain in the pt100 and so little noise? The amp is almost dead quite, even on the high gain channel..
You tell us :wink:
User avatar
Reeltarded
Posts: 10189
Joined: Sat Feb 14, 2009 4:38 am
Location: GA USA

Re: bright cap on the master pot ?

Post by Reeltarded »

lol!
jamme61
Posts: 212
Joined: Wed Jan 18, 2012 2:20 pm

Re: bright cap on the master pot ?

Post by jamme61 »

Oh, I forgot, you guys don't own one, duh.
Bet you could build one. I can't, I'm a hack with this stuff. Thanks for the time.
jamme61
Posts: 212
Joined: Wed Jan 18, 2012 2:20 pm

Re: bright cap on the master pot ?

Post by jamme61 »

Regulated DC heater for the 6 12AX7 preamp tubes provide low-noise and increased tube life. This is really a great amp and the service from John Suhr and his staff, is the best.
Post Reply