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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

http://bias.gs35b.com/

Do you have the radio power all the way up… 100 watts, then set the external knob to 98 or lower? Otherwise you are still dancing with the rig’s internal ALC.

What bias board are you using? Mike

What bias board are you using? Mike

Well done Clark and Jim. Thanks for the follow up and good information. 73, Alek. VK6APK

That works well with the Kenwood hybrids also. I believe I use a 25K pot on my 4 TS-830's (3 drive VHF to microwave transverters and the other is at the amp service bench) but would have to look as it