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June 16, 2019, 09:45:34 pm

Author Topic: Hot swapping output tubes?  (Read 357 times)

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Offline Deke609

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Hot swapping output tubes?
« on: April 09, 2019, 06:06:20 am »
Will I hurt the amp (SII) or output tube (45's) by hot swapping (amp powered on but no signal playing).  Is hot swapping no different for the output tube/amp than powering on/off or is there some sort of soft-start/gradual build up that I'd be bypassing and consequently causing damage?.

45's seem to warm up fairly quickly, and for comparing different pairs, it would be great not to have to power down and then wait 20+ min for the output transformers to recover (I think I read a post from PJ to the effect that OT's take about that long after a off/on -- something about saturation or residual magnetization?).

Many thanks,

Derek
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and JJs)  -> Stereomour IIs (2A3 and 45 Conversion - both fully upgraded)  -> Audeze LCD4

Offline Paul Birkeland

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Re: Hot swapping output tubes?
« Reply #1 on: April 09, 2019, 06:28:26 am »
This is not a particularly safe practice.  I, for one, am not going to try and predict what will and won't break, because this is just such a bad idea that I don't want to offer anything that can be misconstrued as encouragement. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Deke609

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Re: Hot swapping output tubes?
« Reply #2 on: April 09, 2019, 06:50:48 am »
Thanks PB.

this is just such a bad idea that I don't want to offer anything that can be misconstrued as encouragement.

That made me laugh. I have no shortage of such ideas and I can interpret just about anything as encouragement (think Dumb and Dumber: "So you're telling me there's a chance").   :D
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and JJs)  -> Stereomour IIs (2A3 and 45 Conversion - both fully upgraded)  -> Audeze LCD4

Offline 2wo

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Re: Hot swapping output tubes?
« Reply #3 on: April 10, 2019, 04:43:20 am »
Terrible idea, even if it didn't kill your amp you'd probably still need to wait the 20m for the trans to recover, maybe even longer...John   
John Scanlon

Offline Deke609

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Re: Hot swapping output tubes?
« Reply #4 on: April 10, 2019, 06:11:27 am »
Thanks John. It is unanimous: a terrible, horrible idea.  But I thought I'd ask on the off chance that it would be fine.

Appreciate you and PB responding to save my amp and tubes.

Derek
______

Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and JJs)  -> Stereomour IIs (2A3 and 45 Conversion - both fully upgraded)  -> Audeze LCD4