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Old 3rd January 2008, 09:24 PM   #131
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Quote:
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

Glenn
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Old 1st June 2012, 07:01 PM   #132
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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, 12:06 AM   #133
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Quote:
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, 07:30 AM   #134
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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, 01:47 AM   #135
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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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