19-09-2022, 11:50 PM
Thanks Chas. Perhaps not the Louvre, but I'll take the compliment, anyway.
The neutralising capacitors were actually easy to adjust, I found, although fiddly. There's a technique for adjusting them that involves applying drive without PA plate+screen volts applied while measuring the PA output.
As for the 0.01 uF bypass capacitors, I used what was on-hand. I don't think 10 nF caps were made until the mid-late 1970s.![[Image: wink.png]](https://www.ahrdf.net/forum/images/smilies/wink.png)
The neutralising capacitors were actually easy to adjust, I found, although fiddly. There's a technique for adjusting them that involves applying drive without PA plate+screen volts applied while measuring the PA output.
As for the 0.01 uF bypass capacitors, I used what was on-hand. I don't think 10 nF caps were made until the mid-late 1970s.