How to recognize if a tube is going bad

butchbass · 1490

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Offline butchbass

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on: September 27, 2013, 03:24:56 PM
I do not have any issues with my gear but was wondering how do you recognize that a tube is going bad? I had some low level sporadic squealing in one channel of my Foreplay last year and replaced the 12AU7s and the squealing stopped. Are there other indicators of impending tube failure?

Butch Gross
Stereomour II/  Blumenstein Orcas, Dungenes/Schiit Bifrost Multibit/Amarra

Offline Grainger49

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Reply #1 on: September 27, 2013, 03:36:48 PM
When I wore out my Sovtek output tubes in my Paramours the sound got flat, flabby and kind of muddy.  Sometimes the 12AU7s lose all definition and get bad treble.


Offline Doc B.

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Reply #2 on: September 28, 2013, 06:04:55 AM
Squealing is often simply from dirty tube pins.

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

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