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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.

Hi amp builder, I just finishing a 6 meters amp using a pair of 3-500Z on old Marconi BH-30 case. Everything is working as it should but i can't find the right parasitic supressor setup. I am using

RF parts replaced the tube. The owner had the optional warranty. Its back up and running great. C

Compare it with a known good tube, idle current and PO should be within 20% or so. Otherwise use it in a single tube amp until it dies of old age. Carl

Yep. It blew it wide open, which I verified with the Ohmmeter and 1000V Megger. The thing I do not know, is how much, if any, of the grid is left intact, inside the valve. Hence the

<Yeah, I have done that with a 3-500Z which showed a short. I stuck the <shorted element pins across the 12V battery in my car. <It certainly cleared the short and I have kept the tube but I'm too

Yeah, I have done that with a 3-500Z which showed a short. I stuck the shorted element pins across the 12V battery in my car. It certainly cleared the short and I have kept the tube but I'm too

You might be able to blow the short out with a bit of voltage. Using a variac or a seperate supply, AC or DC, instantaneously apply the voltage; I do it with the tube on the bench, a pair of clip

Swapped the right tube out and the condition is gone.? Looks like a problem in cold start with grid short. C

That is not possible on this brand of amplifier. The filament are in series. C

Thank you for the reply.? Its sad because the amp will run all night once the short is cleared.? We will swap out a spare tube one at a time to find which tube. C

http://bias.gs35b.com/ http://bias.gs35b.com/ ## scroll way down to see the current supplier of these bias boards. which is Ron Wilson, K4POZ Ron@... Jim VE7RF

<Pull the tubes and turn on from cold. If all ok, insert one tube at a <time and retest. If it is a temporary short, as you suggest, then it <will surely show itself and you can determine which tube

Pull the tubes and turn on from cold. If all ok, insert one tube at a time and retest. If it is a temporary short, as you suggest, then it will surely show itself and you can determine which tube is

A friend has a 2k4A amp with two 3-500Z tubes(RF parts).? It has an odd problem. When you turn the Amp on, the Grid meter pegs backwards and the plate current shows 200MA.? If you key the mic about