Antique Radios Forum

This is the temporary home of the Antique Radio Forums while a new server to host it is being found. You will have to register here to post. Please Note: None of these topics will be preserved when the original forums are back.
 
HomeCalendarFAQSearchMemberlistUsergroupsRegisterLog in

Share | 
 

 71a, grid to plate shorts common ?

View previous topic View next topic Go down 
AuthorMessage
gadget73



Posts : 10
Join date : 2010-10-13

PostSubject: 71a, grid to plate shorts common ?    Fri Oct 22, 2010 3:31 pm

I have a Fada 20 that has had some work done previously. The original phase splitting interstage transformer has half an open secondary. At some point, a small Stancor transformer was installed to replace the defunt original, and it too has half of the secondary open. The half that is burned out on each goes to the same 71a tube socket. That particular socket is the only one that was missing a tube when I got the set. I'm thinking someone realized the tube was a dud after replacing the transformer.

The odd part about this is that the output stage works normally with a pair of good 71a tubes installed. I get infinte resistance from grid to ground on the one tube, but the scope shows signal levels comparable to the other side that reads normally. It definitely amplifies on both tubes too because I have sound running either tube individually. Am I OK running it like this, or am I just asking for problems ?
Back to top Go down
View user profile
 
71a, grid to plate shorts common ?
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Common names
» What must I do to get a Rathian Plate?
» Is Low Rank Lagi worth the plate?
» On the Grid, there is only War.
» Rathalos's Plate

Permissions in this forum:You cannot reply to topics in this forum
Antique Radios Forum :: Antique Radio Forums :: Electrical/Mechanical Restoration-
Jump to: