Quote:
Originally Posted by FloridaBoy
Be careful with the tubes with tungsten filaments. They are usually very microphonic. IMHO, it's probably best to get these old tubes from a solid dealer and avoid the auction site.
I did get a pair of NOS NU 71a's from Tube World Express and they are settling in nicely.
I have not tried the 12A varients.
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I don't know how he does it, but Dennis showed me Friday, he has completely eliminated the microphonics in the LP-2030 design.
Even tapping on the 01A tubes didn't cause them to ring.....