Good Day All,
So I'm listening to music and I hear a quick pop. I didn't immediately hear any change in the sound coming out of the speakers - I was listening at a low level.
I powered off my CD player and preamp to check my bias on the ST120. The left rear bias was high - about 23 VDC I think. The other three bias points were OK at about 0.550 VDC.
Then I saw a quick light show in the SOVTEK GZ34 rectifier tube. I powered off the amp to investigate further.
I found that the 10 ohm resistor on pin 1 of the rear left KT88 tube was physically chipped and the resistance was open so that obviously needs replaced.
What might have caused this and might it have damaged my left rear KT88???
I'm going to test the GZ34 and have a spare if needed. I'll have to look around to find a tube tester to test the KT88.
Assuming I have all good tubes - should I just replace the resistor, plug everything back in and fire it up and see if all is well???
Any suggested methodolgy I might consider so I don't damage anything further?