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EQUIPMENT FORUMS >> SE34I.5 >> PSVANE Type II EL34 problems
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Message started by hifitubes on 01/05/14 at 06:31:06

Title: PSVANE Type II EL34 problems
Post by hifitubes on 01/05/14 at 06:31:06

I'm on my 2nd replacement tube and now seeing bias meters out of balance, and then saw the first arc on this amp using a GZ32.

I think possibly the tubes are unreliable and going into runaway state?

Recommended Operating Conditions(reference value)
class A1, singel tube, fixed bias
Ua(b) …………………… 265 265 V
Ua……………………………250 250 V
Ug2……………………… Rg2=2k Rg2=0
Ug3……………………………0 0 V
-Ug1……………………… 14.5 13.5 V
Ia(0) ………………………70 100 mA
Ig2(0) …………………… 10 14.9 mA
Gm…………………………… 9 11 mA/V
ri……………………………18 15 kΩ
RL…………………………… 3 2 kΩ
Pout………………………… 8 11 W
Dtot…………………………10 10 %

http://www.partsconnexion.com/TUBPT2-76715.html

Title: Re: PSVANE Type II EL34 problems
Post by Rivieraranch on 01/05/14 at 12:31:21

That's why I call them "Pissvane."

Title: Re: PSVANE Type II EL34 problems
Post by Lon on 01/05/14 at 16:24:46