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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

6SN7 Equivelents
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Old 8th November 2019, 08:52 PM   #41
6A3sUMMER is offline 6A3sUMMER  United States
diyAudio Member
Join Date: Jun 2016

The most often cause of a different sound is the two problems as you stated.
Bad operating conditions or topology
Worn out tube

Or, a bad new tube (seen it too).
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Old 8th November 2019, 09:04 PM   #42
kodabmx is offline kodabmx  Canada
Spreading triode love.
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Join Date: Oct 2011
Location: Toronto
6SN7 Equivelents
True... I've had some NOS tubes arc over on power up or ring like a bell. Never had low emission though, although I didn't test the tubes that arced over lol
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