Fender red knob "The Twin" amp - thoughts?

[laurie]

Output tube socket swap.
.
New Belton

20260702_052012(1).jpg (371.27 KiB) Viewed 593 times

.
Old with loose pin receivers

20260630_142123(1).jpg (427.91 KiB) Viewed 593 times

[fernieite]

Nice!

However, it's looking like I'll be old and grey by the time you get around to finishing this thing! Wait a minute...

[laurie]

Getting close to being complete.
.

20260703_061034(1).jpg (367.14 KiB) Viewed 572 times

[laurie]

I'm slowly working through the amp sorting out issues.

One symptom was that it would work at full volume for a while, then there would be a loud "pop" through the speaker and the volume would be much reduced and lots more distortion.

This fault (there are other issues I'm chasing, but this one had a specific cause) was a failed phase-splitter tube. As it heated up something inside it was affected by the heat.

I'm certain this is the original tube from when the amplifier was made. See if you can guess why...
.

12AT7.jpg (76.65 KiB) Viewed 554 times

[Pepe]

What good things come from Germany?!

[laurie]

What good things come from Germany?!

It was the "E" Germany... has to be from prior to October 1990

[Pepe]

Ah, I didn't see that at first look. How very strange! GDR components in an American amp?!

[laurie]

Ah, I didn't see that at first look. How very strange! GDR components in an American amp?!

Apparently it was fairly common - Google tells me this particular tube was widely used.

[laurie]

20260706_105542(1)(1).jpg (314.72 KiB) Viewed 525 times

[Pepe]

Beautiful! Very clean!