06-21-2021, 12:16 PM
Working on another 610 and I need to get my mind straight.
The chassis is wired similar to the later model, but with a few exceptions. Thought I'd touch base on 3 items first.
First, there is no phono switch. So can I assume the top of the volume pot connects between 31 (51K resistor) and 32 (the lower 110 mmf cap)?
Second, the existing chassis has the cathode of the 78 tied to ground (looks like factory wiring).Where should it really go?
And last, on the existing chassis, the cathode of the 6A7 goes through a 20Ω resistor to ground. Neither schematic shows that.
Got more, but Ithought I'd try these out first.
Pat
[Image: https://i.imgur.com/xnCAN3q.jpg]
[Image: https://i.imgur.com/NdRdTAS.jpg]
The chassis is wired similar to the later model, but with a few exceptions. Thought I'd touch base on 3 items first.
First, there is no phono switch. So can I assume the top of the volume pot connects between 31 (51K resistor) and 32 (the lower 110 mmf cap)?
Second, the existing chassis has the cathode of the 78 tied to ground (looks like factory wiring).Where should it really go?
And last, on the existing chassis, the cathode of the 6A7 goes through a 20Ω resistor to ground. Neither schematic shows that.
Got more, but Ithought I'd try these out first.
Pat
[Image: https://i.imgur.com/xnCAN3q.jpg]
[Image: https://i.imgur.com/NdRdTAS.jpg]
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
