Tube nomenclature

butchbass · 1249

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Offline butchbass

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on: October 11, 2013, 05:40:55 AM
What would the difference in a 12AT7 and a 12AT7WA be? 

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

Offline Paul Birkeland

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Reply #1 on: October 11, 2013, 05:48:45 AM
The "W" traditionally indicates some additional testing in accordance with military specifications.

The "A" indicates a controlled heater warmup characteristic.

Neither of these are appreciable differences. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Grainger49

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Reply #2 on: October 11, 2013, 09:50:04 AM
They are drop in replacements, the "WA" is possibly better sounding for Paul's reasons.


Offline butchbass

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Reply #3 on: October 11, 2013, 03:53:27 PM
Thanks for the info. Music enjoyment is the best part of this hobby but the eduction also brings fulfillment.

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

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