I have an 210 HD Onethirty from 1976.
I have a Question to a weird tube.
The sticker inside tells me, that I need a 12AX7A or 7025 tube. So I checked the assembled tube , but its a Sylvania made in USA ADB 936, respectively ADB 639 (depending on how you read the number, top down or bottom up).
Is it a 12AX7 clone or just the wrong tube?
Thanks a lot from Germany
210 HD Onethirty with weird Tube Sylvania ADB 936