01-22-2018, 03:06 PM
Ron;
I think you are right. I have some Octal sockets of the saddle mount type on hand but no Loctal sockets. Radio Daze has some but they are $2.25 apiece. I also noted that the tube that seems to exhibit the problem pegs the gain meter on the tube tester. The other 7H7 seems to show normal gain rise. That 1st IF 7H7 does not even show slow rise in emission - immediately pegs the gain meter in the tester. I think the tube has an internal short even though it does not show up on the tester. I need to check to see what type of gain characteristics the 7H7 has compared to common Octal IF tubes. Probably a 6SK7 would work fine. It is designed to work with AGC regulation.
Joe
I think you are right. I have some Octal sockets of the saddle mount type on hand but no Loctal sockets. Radio Daze has some but they are $2.25 apiece. I also noted that the tube that seems to exhibit the problem pegs the gain meter on the tube tester. The other 7H7 seems to show normal gain rise. That 1st IF 7H7 does not even show slow rise in emission - immediately pegs the gain meter in the tester. I think the tube has an internal short even though it does not show up on the tester. I need to check to see what type of gain characteristics the 7H7 has compared to common Octal IF tubes. Probably a 6SK7 would work fine. It is designed to work with AGC regulation.
Joe
