More Fun With Magnavox: The 9300 Series

[wparks]

Thank You @nate96z28 - it was an adventure- a couple of hidden short circuits, a janky metal vapor corrupted 5AR4 that kept arcing, and a minor volume control issue. Great work in hanging in there and not getting too frustrated working through these problems. Really nice build!
The schematic for the hybrid build (Z-565 version front end with buffer, tuning and back end for the stock Magnavox OPT's) is posted below. Let me know if you see anything I biffed.

How did the tubes from Ukraine work out? Do they seem fairly matched channel to channel?

 

[nate96z28]

Schematic looks great! I put a 100k audio taper pot in place of the two 470k resistors off the inputs but otherwise my circuit is identical.

I haven't gotten my matched quad set of Telam EL84s yet so I'm using an unbalanced set that is biased to .44/.58v, but the amp still sounds great! Should have the new tubes in a few days.

 

[slater529]

Thanks everyone, for all of your help, particularly @wparks for helping me troubleshoot! My amp is now working and sounds fantastic. Very quiet and produces a nice clean, musical sound. I'm actually really enjoying listening to it. Anyway, here is a shot of the build:

Love the witch hat knob!