10-02-2023, 04:38 PM
Hi Ron.
The 12A8 and the 12SK7 both have pin 1 connected to chassis ground. The 12SQ7 DID have pin 1 connected to the chassis also. Just like yours. But the sound was garbled. I disconnected pin 1 of the 12SQ7 from chassis ground and instead connected it to B-. Now it works fine. I did use a PM speaker. Actually, the same one you used. I'm in the process of converting another 54C right now. We'll see if it acts the same.
The 12A8 and the 12SK7 both have pin 1 connected to chassis ground. The 12SQ7 DID have pin 1 connected to the chassis also. Just like yours. But the sound was garbled. I disconnected pin 1 of the 12SQ7 from chassis ground and instead connected it to B-. Now it works fine. I did use a PM speaker. Actually, the same one you used. I'm in the process of converting another 54C right now. We'll see if it acts the same.