Swapping power tubes on Crack has whine in right channel

computerman · 1266

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Offline computerman

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I have built a Bottlehead Crack with Speedball.

When I use the GE 6080 that shipped with it, it works flawlessly.

I bought an RCA 6AS7G from tubedepot.com and it looked clean; the box certainly wasn't. This is supposedly a "known to work" from the tube-rolling forum.https://forum.bottlehead.com/index.php?topic=663.0.

I get a whine only in the right-channel when I use this tube. I've reseated it a few times to no avail. I roll back to the GE and the whine goes away.

This whine is not affected by volume levels.

Is this a bad tube, or is it "just so much better" than the GE that it is showing a bad solder joint, and therefore I should reflow all my connections?

  • Passed all resistance/voltage checks
  • Tube has been baking in for likely 48 hours of on-time
« Last Edit: April 05, 2023, 09:42:43 AM by computerman »



Offline Thermioniclife

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Reply #1 on: April 05, 2023, 10:42:10 AM
Sounds lika a bad tube. but it shouldn't hurt to leave it on for a few more days.If still no good try to get your money back.

Lee R.


Offline Doc B.

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Reply #2 on: April 05, 2023, 07:01:32 PM
Try cleaning the pins.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.