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Questions about tubes and gear that glows. FAQ

The Mullards were in very snuggly, but . . .

It's possible one or more of the pins were dirty. They were quite hard to remove. Had to hold the sockets down because it seemed like they would pull out of the PCB otherwise. Actually, the JJs slid in a bit easier though they're snug too..

I'm going to get some Deoxit for the tube pins though. The preamp is brand new so the sockets should be clean I'd think.

Now that I believe the problem was clearly with tubes (since I've had no issues with the JJs), my next step after the Deoxit will be to put the Mullards back in, but swap the gain stage pair for the driver pair (front pair with rear pair) and see if the static returns or if everything is OK as it is with the JJs. In that case I'll replace the bad pair (hopefully covered by warranty, but the timing is tight).

The JJs don't sound bad at all actually. The major difference is that the Mullards have better bass (both seemingly deeper and definitely tighter more defined). The midrange and highs sound about the same to me actually.
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  • The Mullards were in very snuggly, but . . . - JoshT 12:47:46 07/02/17 (0)

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