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Forum: Thermionic Emissions
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Topic: New Production Tung Sol 6550, Penta KT88s
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| Re: New Production Tung Sol 6550, Penta KT88s [message #98818 is a reply to message #98817] |
Thu, 28 August 2025 06:31 |
positron
Messages: 143
Registered: May 2020
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Master |
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Wayne Parham wrote on Wed, 27 August 2025 20:28
positron wrote on Tue, 02 July 2024 23:41I am wondering what the idle plate dissipation is with the Audio Note kit 2?
Sorry for the super-late reply on this thread. Too much keeping me busy these days. But I did make a note to remove the bottom panel and check this when I could. Finally got around to doing that today:
Right channel
Cathode resistor: 281Ω
Voltage across it: 19.50v
Current: 69.4mA
Left channel
Cathode resistor: 278Ω
Voltage across it: 18.95v
Current: 68.2mA
I didn't measure the plate voltage, which would have been needed to calculate plate dissipation. To be honest, I was more interested in plate current.
It's almost exactly at the midpoint of what I consider to be maximum in this amplifier; I think the maximum safe current flow is 125mA, and that's the value of fuse I installed in series with the cathode.
My apology for stressing your schedule Wayne. I appreciate you taking the
time as you are quite busy.
We are running essentially the same idle current so similar harmonic
structure.
Cheers and thanks again Wayne.
pos
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| Re: New Production Tung Sol 6550, Penta KT88s [message #98819 is a reply to message #98818] |
Thu, 28 August 2025 08:30 |
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Wayne Parham
Messages: 18961
Registered: January 2001
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Illuminati (33rd Degree) |
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Oh heavens, you didn't stress me! I really felt badly for not doing that sooner!
Honestly, my being busy is a happy thing. I have lots of fun projects on my plate. It's just that I'm more used to doing one at a time and doing it obsessively. Now days, I have several and I can only give a few minutes a day to each one. But that's OK.
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