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I'm guessing it doesn't matter if the 300a's preamp hasn't worked in ages.

The preamp relay could still cause this issue?

I couldn't do the repairs myself even if it's the one that could be repaired.

I'm going to take the amp out of line. If the issue ceases It's obviously the amp causeing the recive drop problem.

Would you mind helping me to know for sure which one of two 300a's this is?

I can take and post photos.

Do you need photos of the tops tube side or under side?

Both? Let me know. I'll take them and I'll take it from there.

I might retire it. To bad. I do enjoy it. It makes an excellent match for the 2340.

Let me know if you'll need to see top and bottom side of the amp. I'll take plenty detailed photos. Thanks again nomad. 73