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Re: Sonic Difference between New Tung Sol 6550 vs KT120 vs KKT150 [message #97911 is a reply to message #97910] |
Wed, 24 July 2024 18:37 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) |
positron
Messages: 111 Registered: May 2020
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Viscount |
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Wayne Parham wrote on Wed, 24 July 2024 08:23
gofar99 wrote on Tue, 23 July 2024 21:52I find the JJ KT88s to last forever. The ones in my original amps (2009) are still fine. I run them in class A at 85% dissipation U/L mode.
Seems like I remember you saying this on another thread, or might have been in person at one time, probably at LSAF one year.
I thought it was likely that the differences in what I got out of my JJs and what you did was the circuits they were being used in. That Audio Note SET circuit definitely eats JJs so maybe they run more quiescent current or something.
I agree Wayne and would guess running a condition, such as plate
voltage, at maximum rating.
I have had my JJ KT88s for years now and not a single issue. But at
29 watts plate dissipation and ~450 plate volts, I am running them
pretty easy.
Right now, I am testing my JJ E88CC tubes at lower filament voltage
to see how they act, their longevity.
cheers
pos
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