Power transformer: B+ 650v unload (590v loaded), 40v-50v bias, 6.3v filaments.
Output transformer: It seems like there's 3-4 secondary windings plus the feedback winding. I was able to get 4.3k @ 8 ohm, 4.3k @16 ohm, and 8.8k @ 4 ohm mix different secondary windings. Not sure one of the windings, since it has about 60-150 ohm form primary legs (something to do with primary winding? Or bad secondary winding?), so I used heat shrink tubes to isolate it. I don't have a schematic, so I don't know how the secondary winding is usually setup.
Checked the filter caps with a Sprague Capacitor Analyzer, and brought up the voltage slowly. Put in some old tube, and played it using the phono input. Please check out the YouTube video.
The amp comes with the old tubes in the video, some might be microphonic or noisy. Tesla 806S, 2 x JJ 7027a, 3 x 6SN7 (Sylvania, RCA, GE...), OC3w (I couldn't find a OD3). It put out about 70 watts before it clips using those tubes.
The amp still needs to be worked on, such as changing out the electrolytic caps, noisy resistors, new tubes, XLR jacks, 3-prong power cord, etc. Sold as is for parts, restoration, guitar amp conversion. Thank you for looking.
1965 Wester TP-85 Tube Amp
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