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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

I have four tubes and also several 4-1000 tubes.? Two of the 3-1000Z are brand new out of the box. All make the same current and power.? I know the B plus is correct, I used my Fluke and it reads

It is hard to argue with the Eimac spec sheet and curves so I dont know what Clark has there. I wouldnt expect a damaged tube to exihibit such results but........ Is there any sign of internal gas

Thank you Dave. I will look into that board. C

It's worth looking at this site:http://www.ifwtech.co.uk/g3sek/boards/triode/triode-1.htm What Ian doesn't know about such topics isn't worth knowing. Dom F1FRV could also give good

<clark@... Apr 7 6:41 PM <I understand the differences in class and imd. However. 13 volts won't cut the tube off to 100 ma. I have <the amp here with the triode board all the way up

Yes, I can see your confusion. I would have thought that Carl's estimate of 13V would have been pretty close to the mark, as the circuit I have for a 3-1000Z running at 3kV, has 0V bias and idles at

Carl was talking 100mA ZSAC, not -100V bias voltage. Cheers, Alek. VK6APK

Class C bias means zero Ip in standby, my comment was right out of the Eimac tube manual for Class B modulators and 100 ma PER tube idle current. Class B is class B no matter what your using it

Thanks for the reply Carl. I am confused as to your suggestion to use -13 volts. I am using -39 now and its still 225 MA at 4000 volts.? The Sheet lists -100 to be Class C bias. C

My experience with the Alpha and a few later EBS circuits is that the switching transient spike goes out over the air. Several have commented the same about the AL-80B circuit and they have removed