开云体育

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

You get the overshoot because the rig has to develop the ALC after keyup. 100k pot, 9 volt battery, plus to ground, neg from pot to ALC jack. Set power out with pot. No overshoot, since “ALC”

I got the Bias board working correctly. Thanks for Jim for the support on the phone.? The instructions should be updated for the board. It suggests adding a 10K pot in series with the factory board

That is the Plan. Its a major pain to get to the board as the Deck has to come off the Cabinet.? Maybe later today I can take a look inside. The tube has full output power and is the same as the

Get inside the single 3-1000Z amp....and measure the actual voltage being applied. It may well be a simple thing, where you have it hooked up incorrectly, and have diverted a huge chunk of that 39

That is a great question.? Its a variable supply and I just started off 0 and turned up until I had it set. I would need to measure it.? I read the Datasheet. I would think -15 to -20 range would do