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Its not the input tube...

Changed them, and oscillation remains in one channel.

Its really low frequency, around 8-10Hz where the resonant peak of the coupling cap and grid choke is. Only one channel however.

Sigh...

As suggested, maybe a bad coupling cap? Although I find that hard to believe (VCAP CuTF).

I could replace the new Silk grid choke again with the 'Old' one (mange quest I believe). The old one has lower inductance.

If its still oscillating, I have to suspect the coupling cap I guess...

NC


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