KE1GF Piss-Weaker

[K1JJ]

HA!!!
The Cakepan PW guys will love that shot, Joe!  

T

[WA1GFZ]

Glen,
Very cool. I was talking about FET bias temperature compensation.
I wondered if you plan to fold the bias back if the stage gets too hot.
I see the Fairchild FETs QIX found as a big brother to the 840s.
Imagine a big linear amplifier using them.  fc

[Glenn K2KL]

That's my next project as soon as I finish the PW exciter, a mosfet linear for 160-80-40... I imagine I'll go with just some sort of temp indicator or maybe a shut down circuit. You couldn't fold back the bias and still continue to operate, well, you could but you would no longer be linear, right?

Glen,
Very cool. I was talking about FET bias temperature compensation.
I wondered if you plan to fold the bias back if the stage gets too hot.
I see the Fairchild FETs QIX found as a big brother to the 840s.
Imagine a big linear amplifier using them.  fc

[WA1GFZ]

Yes Glen but push pull may allow you to get closer to class B. Distortion would go up. I think motorola used a little in their Fet linears.
iIhave a bag full of MRF150s waiting for me to build them into a big ss linear when I have nothing to do. Still it would be interesting to see how well switching FETs work in the linear mode. I read the TO220 package had less series L so were better devices.  I'm not sure if that is still true
but sounded good at the time. I never grew the BAs to apply positive bias to my 14 PPP IRF840 rig. Same is true with my 22 fet 75 m rig but it would only take lifting 1 jumper. .......keep us posted

[Paul, K2ORC]

As a cakepan chassis fan, I LOVE it!  Many thanks for posting that, Joe.  Too cool.