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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: A tale of two amps

I came across something I found very interesting on another forum recently. Here it is:

"Some time ago, I had my Cary CAD-211AE amplifier (110W push-pull) on my engineer's bench to do some repairs. We had a very interesting conversation. It went something like this:

Him: "Look at this. The voltage rail on the push part of the circuit measures at 904V. The voltage rail on the pull part of the circuit measures 890V"

Me: "You are saying that the push voltage and the pull voltage are different? Will that affect the sound?"

Him: "Yes it will"

Me: "Why are the push and pull voltages different?"

Him: "Because of valves. Most likely the valves on the push side are of a different specification to the pull side""

He goes on to note that this is unavoidable. Even valves that start life equivalent will drift.

Things I'm wondering:

- How could ANY push-pull (or "differential") amp avoid such a problem?

- This has to have some audible effect on the signal - especially low-level signals. (Hmm, that's just where SE amps really shine, isn't it?)

Thoughts?



Edits: 05/08/21

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