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Does anyone know what brand of power tranny is used in a fuchs lucky 7?

ZiggY!!

Member
Messages
163
Apparently they have a primary tap for 120 & 240volt operation. I am wanting to rewire mine to run off 240volts.

The output tranny is clearly marked as a hammond but the power tranny only has FATP-L7BJ21 & 9960519 markings.

Does anyone know anything about these? Or perhaps have the wiring diagram for them that they received from Fuchs?

I know its a long shot...

I've tried emailing Andy, but my guess is he is a very very busy guy.
 

Fuchsaudio

Member
Messages
7,767
Here's the setup:

Connect black/blue and black/white wires together and tape them up, the remaining wires (2) are the AC input wires. Currently the amp is wired for a parallel primary, and you'll be switching it to series wired windings. Rebias as long as you're in there.

Sorry for the delay, I was afk for a couple of days.
 

ZiggY!!

Member
Messages
163
Done done and done...

very straight forward and worked like a charm. It also gave me a chance to use my new bias rite... gee its a great gadget! I reset it to 40ma as mentioned in the manual... It is running an EH 6CA7. It has a huge bottom end, perhaps a little too much for my old 1970's greenback to handle... I think i'll change it to an EL34.

thanks again Andy!
 

Fuchsaudio

Member
Messages
7,767
You can push that bias up a lil to like 50 or 60 if you wish. It will increase clean headroom and makes the grind a little sweeter. 6V6's run nice at 40 ma in that particular amp (since the B+ is like 350), the EL-34's seem to really shine when running a little warmer. (in best Aussie accent) Enjoy mate.
 

ZiggY!!

Member
Messages
163
Originally posted by Fuchsaudio
You can push that bias up a lil to like 50 or 60 if you wish. It will increase clean headroom and makes the grind a little sweeter. 6V6's run nice at 40 ma in that up, the LE-34's seem to really shine when running a little warmer. Enjoy mate.

Excellent! I'll give it a try...

Thanks! :dude
 




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