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Looking for Mikael's KT88 Schematic
Looking for Mikael's KT88 Schematic
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Old 3rd January 2008, 10:24 PM   #131
porkchop61 is offline porkchop61  United States
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Location: Mansfield, Connecticut
Originally posted by Depanatoru
You have to use the voltage between plate and cathode . It's the plate voltage to ground minus cathode resistor voltage.
In fact it's simply the Ohm's law , tube power dissipation (W) = voltage across the tube ( plate to cathode ) (V) x plate current (A) .
That's what I thought, I was measuring from plate to cathode.
Looks like I'm just within the limits for the EL34. Probably won't last too long at that bias point. It does sound good though!
Thank you

"Imagination is more important than knowledge"
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Old 1st June 2012, 08:01 PM   #132
jmillerdoc is offline jmillerdoc  United States
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Anyone have a copy or link to the schematic of this amo that uses the feedback from plate to plate with the 33k resistor?
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Old 3rd June 2012, 01:06 AM   #133
scott17 is offline scott17
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Originally Posted by jmillerdoc View Post
Anyone have a copy or link to the schematic of this amo that uses the feedback from plate to plate with the 33k resistor?
Post #5 on this thread:
KT88 SE Abdellah (modified by Alex Gendrano) + AK.. - AudioKarma.org Home Audio Stereo Discussion Forums
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Old 3rd June 2012, 08:30 AM   #134
revintage is offline revintage
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The silliest thing to do would be to add plate-to-plate feedback to this driver. It will heavily increase distorton due to the lowZ load on the driver. If you for some reason still want to try, LEDs in the cathode circuit is also totally useless. Must be an unbypassed resistor to help things up. Unfortunately triodes and plate-to-plate does not go together very well. Best done with a potent pentode driver.

If you want lower Zout instead of the very high 4ohms of the UL version you should use cathode feedback over the outputwinding as George suggests.
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Old 29th July 2014, 02:47 AM   #135
arold19 is offline arold19
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When I look to my James 6123 transformer, I understand that if I use the 5K primary winding, it not have 43% screen but 35%... Is that important?
The 43% screen is available only when using the 3.5K winding.

Thank you.
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