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Like I said something is filtering posts. I can post a test message only. Doug Canada; the ship of fools where corruption and politics are synonymous

Let's try this post for the 3rd time and see if it comes through. I have a GU-78B that has developed a grid short. I have determined the grid short initiates about 2 minutes after power on and ends

Other than one of my test e-mails getting through, other posts have not. Something is screwed up! And nothing is coming through on the Amps reflector either. Doug "The difference between stupidity and

YAWN At least Rich and I were friends since about 1996 and I miss him I cant say the same about you. Go back under your GU-74B rock and behave Carl

Indeed Joe, the forum has been quite slow since the sad demise of central protagonist Rich Measures and the Rich / Carl sideshow jousts... There's more interesting activity on the Amps group nowadays.

No, not dead, been a bit slow, but not slow enough to worry. Joe - W7RKN

Beep...beep...beep...beep...beep...

I have a GU-78B that has developed a grid short. I have determined the grid short initiates about 2 minutes after power on and ends after about 5 minutes. I have tried unsuccessfully to 'burn' the

OK the reflector is working now. Before, my message disappeared. I have a GU-78B that has developed a grid short. I have determined the grid short initiates about 2 minutes after power on and ends

Canada; the ship of fools where corruption and politics are synonymous Ham Amplifiers reflector dead?

Did you try tuning the choke about 30 Hz higher? Carl

I made a serious error when plugging numbers into the PSUD-2 power supply software. Like an idiot, I used the wrong plate xfmr DC primary resistance. I was plugging in ".1 ohm"..... when it shoulda

Ok, here is why a.... C1 - resonant choke - C2 cap is 1 step forward and 6 steps backwards. Ditto with a classic ( henry radio style) .. resonant choke - Cap config. When you resonate the choke, at

Hi Jim, Sorry about the late answer. I ending 1300W with 70W amp and grid current on the limit. I will keep it like this for now. Several coil have been tested and the last one was the best

Excellent!? That is exactly what I have used for decades when trying to move extremely angry electrical pixies from one place to another.? Sometimes, I have run the 440 through Teflon? tubing

If you use GM3SEK's pi spreadsheet, you will have some wiggle room. The trick is to insert a tiny bit of uh... between plate block cap and C1 main tune cap. The combined tube C from both tubes ( anode

I'm using neon sign HV wire on a 10,000 volt 30KW FM transmitter ( Inside a run of metallic conduit ) Packard 440 ignition cable is tinned / stranded from Auto Parts stores... you could run it inside

Does anybody know how much max V is on RG-213 ? Like what are the results if a hi-pot tester used..and say cranked up to the point where just a few microamps occurs . I have an application where I

Hello Jim, Thank for your feedback. Yep resting current is on higher side Eimac recommand 58 mA per tube so your dead on. I finally finding a good combinaison of resistor-L. The commercial unit was

## with 150ma + 3500 vdc, idle power = 525 watts. ## I would reduce the idle current down to 100 ma.