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Will do this afternoon. I will report my findings. Thank you

I checked the zener and the other two diodes here with my fluke appear to be ok. That's disheartening...

What ma choke is most commonused and what is the best place to source them out thx

Will do! I hope to tackle it this weekend. If I can locate a zener in time thabks

It is grid driven

Those failing would cause it to blow a fuse when Keyed only? As I said in my first post, I know little aboutaAC amplifiers but I would think that if that diode bank was defective it would blow the fuse even in idle

I have this Tennessee Walker amplifier with 2 4cx250b tubes. It was accidentally driven too hard and got one of thettubes. I replaced them with brand new tubes. Now, on key down it instantly blows the ac fuse. It has to have a short somewhere. Any ideas on this would be great. I know little...

I read all nine pages of this threadSoSoundslike a ccouple of you guys are experts on these. Mine will pep at 350w when first fired up but as you talk the wattage immediately starts to fall back and eventually loses close to 100w.the top of the transistors gets cooking hot. Help please

Im looking for a couple 4cx250B tubes. Prefer Eimac. New or 90-100 percent will work. Thank you. Brian KI4TGA

Been working with Shawn at Stryker. Here is the fix. Worked great of course the final touch up would include heat shrink

Love these new radios but the talkback will not shut off completely it will only turn down and that causes problems with squeal when using a power Mic

Hmmm I will have to look into this then.

O.K. guys, im tired of my inconsistent freq, counter. Please reccomend me a economical counter for basic alignments. Must be sensitive enough. Will be using it for 10-11 meter rig alignments. Thanks

It was a dipped mica. 500v

Crusher, It was the 150pf final cap at the relay. I wonder what would cause this to fail. I have a suspicion that the owner keyed a radio or amp into it backwards. Would this had caused it? Thanks

Crusher, I bypassed the driver pill and output fell to just under 100w pep from the 2 2879 pills. That tells me it is after the driver circuit. I lifted the ground leg of the cap right after the transformer on the 2879. I didn't have a replacement but I figured that if that cap was defective...

Well, I value your opinion physco, but I have to object. I've replaced several individual pills in X Force amps where output was down but not totally dead. Maybe I have misunderstood you. Please explain if I have.

Will do when I get back in town. Thank you

Which one is that

It does have a variable. But that's the first thing I tried. Then I noticed the final transistors were hot.