Bad Voltage readings on V2 and V1 - Mojotone Champ 5F1 build

dan40

Friend of Leo's
Joined
Aug 19, 2015
Posts
2,721
Location
Richmond Va
Glad that the jumpers fixed the problem for you! Plugging your numbers into Rob's bias calculator shows your 6v6 idling at 110%. It's a bit warm but many vintage 5f1 have been running this hot or hotter for years and some of them are still using their original power tubes. I wouldn't worry about the slightly higher B+ if the amp sounds good to you. Getting the line voltage down to 120v will drop that B+ a bit and also cool your bias down a touch if it's really bothering you.
 

guytrongt100

TDPRI Member
Joined
Apr 2, 2022
Posts
10
Location
Chesapeake City, MD
Glad that the jumpers fixed the problem for you! Plugging your numbers into Rob's bias calculator shows your 6v6 idling at 110%. It's a bit warm but many vintage 5f1 have been running this hot or hotter for years and some of them are still using their original power tubes. I wouldn't worry about the slightly higher B+ if the amp sounds good to you. Getting the line voltage down to 120v will drop that B+ a bit and also cool your bias down a touch if it's really bothering you.
Thanks Dan40 for the Calcs!
The amps sounds good for what it is, a practice amp for at home when the family is present. It seems like it is a lower mids type amp and sounds better with a Strat and Les Paul w/ p90's. Could be the Weber CVA8 speaker, see how it is in 20-40hrs of playing.
 




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