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Can't connect to database, trying again.... What are you putting them in? - Kevin Deal - Tubes Asylum

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What are you putting them in?

I'm guessing you're putting a 5751 into an ECC83 hole.

The one thing about comparing tubes that people don't talk about enough how well the tube tests before they made the comparison. If the two tubes measure quite different it's gonna skew the test.

Tube Lore is fun, but it's got some real problems. My biggest pet peeve is the Amperex Pinched Waist 6922. It states that it had a pinched waist to reduce microphonics. Well if that's true, it didn't work, and they stopped doing it pretty quick. PW Amperex are the MOST microphonic 6922's they ever made. Horrible.

They didn't stop making it that way to make it worse, they stopped making it that way to make it better. These were military contracts, and a lot of money was on the line. The thought common in tube rolling that earlier or rarer is better flys in the face of logic.

There are cases where that's true like earlier 5751's having a triple mica. But double mica 5751's aren't very susceptible to microphony anyway.

The very first Siemens 6922's were a disaster. I have a bunch of them in Air Force boxes from 1962. Trash. Bad triode balance that gets worse quickly. Noisy. But the thing we have to remember is they were just learning how to make them.

Sorry to ramble. Didn't mean to hijack your topic. Tell us how they sound.


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