Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Mars-Hall on March 21, 2020, 08:54:29 pm

Title: 6G3 Deluxe cap job
Post by: Mars-Hall on March 21, 2020, 08:54:29 pm

Do most replace the pan caps with original values on these?  Amp still has original orange Mallory caps 1 x 8uf and 3 x 16uf.  Was wondering if people were substituting any values, especially the 8uf?  Of these I've played, I really like the gain structure, not looking for more clean headroom.

Title: Re: 6G3 Deluxe cap job
Post by: sluckey on March 21, 2020, 09:55:49 pm

8 and 16 are still available. I would have no problem with using 10 and 22.

Title: Re: 6G3 Deluxe cap job
Post by: Mars-Hall on March 21, 2020, 10:03:02 pm

Quote from: sluckey on March 21, 2020, 09:55:49 pm

8 and 16 are still available. I would have no problem with using 10 and 22.

What would be the effect of 10uf and 16uf or is the larger step change preferred?

Title: Re: 6G3 Deluxe cap job
Post by: PRR on March 22, 2020, 01:19:58 am

Ask rather what "8uFd" was. On older amps it could be -50%/+100%, or 4uFd to 16uFd. While that may be a CYA spec, certainly 6ufd or 12uFd would all be good.

Modern caps run closer to marked size. (Unlike modern shoes...) A 6.8uFd 20% cap may be fine to control B+ buzz. I'm sure 10 or even 12uFd could be no "stiffer" than some old "8uFd" caps. (I'm not sure "stiff" has real meaning in preamps, but somebody will say he hears it.)