P-P 8236s

[rsumperl]

Good morning everyone,
Can someone please verify my math, my intention is to "play" with P-P 8236s with 500 on the plate and 150 on the screen in AB1. I calculated the P-P load should be 1900.. Am I correct?

Thanks
Ray

 

[smoking-amp]

Looks like the 150V knee is at 770 mA and 70V. 1900/4 Ohms would take that down to 0 mA at 366V+70V = 436V. Then maybe 70 mA of idle current and 1900/2 Ohms for the class A region would roughly cover the 436V to 500V region.

Peak Watts around 240V and 440 mA for 100 Watts peak. Average would be less than 1/2 that, so under 50 Watt. Idle power .07 x 500V = 35 Watts, a bit hot. All roughly calculated, no straight edges.

Max signal between 70 mA and 770 mA for 1/2 of time. Or 440 mA avg for 1/2 time, 220 mA. That pushes the 200 mA max DC rating of the cathode.

This tube has a high 50 Watt rating, but only a 200 mA max DC rating. Might want to cool this off a little, for longer life, like maybe 2200 Ohm to 2500 Ohm P to P OT, 140V Vg2, and 50 to 60 mA idle. Just estimating. Suggest re-plot the details.

 

[rsumperl]

Thank you smoking-amp for your input. I have yet to master the P-P calculation! Given what you mentioned, I will put my order with Edcor on hold and try the 3.3K transformers I have.... somewhere. Moving is always so much fun.