Audio Aero Capitole - 6021W subminiature tube ??

OK. Perhaps the very low numbers looking into the Capitole's outputs indicate that its outputs are transformer coupled. If that is the case, dc resistance measurements probably don't tell us very much.

Based on the additional measurements, I agree with you that the Clayton's xlr inputs appear to be unbalanced. It looks like pins 1 and 2 are both grounded, and the only input used for signal is pin 3, perhaps through a capacitor.

Since the xlr interface therefore appears to be essentially an unbalanced interface, it might be worthwhile temporarily isolating the amp's ac safety ground, via a cheater plug. Perhaps a ground loop, to which unbalanced interfaces are susceptible, is causing the noise (although a ground-loop problem would usually involve low frequency hum, as well as high frequency buzz, and I'm not sure why the rca output would be quiet if a ground loop were the problem).

Also, I'm wondering if the Capitole's output circuit may be having problems due to having the signal it outputs onto pin 2 shorted to ground, by the Clayton. If possible, it might be worthwhile trying a specially prepared xlr cable that leaves pin 2 unconnected.

Just some thoughts.

Best regards,
-- Al

So I went in quest for XLR to RCA adapter.
I have found one gold plated which I liked.
But it got PIN3 disconnected and PIN2 connected to center pin of RCA plug.

But looking at my measurement I need one with PIN 2 disconnected and PIN3 connected to center pin of RCA plug.

So appear that XLR wiring is not universal or my Clayton’s quasi-balanced XLR inputs are wired wrong way ?

Or they are two schools of wiring quasi balanced input in power apms?

Usually USA-made equipment uses xlr pin 2 for the positive polarity signal, and pin 3 for the inverted polarity signal. The opposite is done in equipment made in some European and other countries.

Therefore rca-to-xlr adapters that are available in the USA usually connect the rca center pin to pin 2 of the xlr connector.

If the Clayton is indeed designed to use only one of the two differential signals, perhaps it uses pin 3 instead of pin 2 to compensate for a polarity inversion in its internal signal path. Or perhaps its input circuit is somehow defective, or miswired. All I can suggest is trying to contact someone at Clayton, or one of their reps or dealers.

Regards,
-- Al

I have just sent inquiry to Clayton. Thanks for advice.

After all hassle appeared that Clayton's have been OK. And AA Cap finally died on me. There is no sound anymore, only quiet hum is coming out of both speakers. So I'm going to take advantage of my misfortune and upgrade it. I'm planning to replace Hovland Musicap with VCap CuTF caps, and Philips Jan 6021W with Sylvania . I have heard that Sylvania's are the best 6021W ? Is it much difference between plain Sylvania's and cryoed Sylvania ? Where can I buy cryoed Sylvania's, I'm having not luck finding them.