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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

I have a BTI LK2000(single 3-1000Z) that I have rebuilt a few years ago. The Power supply had previously been changed to a traditional Choke input from the factory doubler supply. The transformer was

oops.. that should have read... with full bore current flowing, choke inductance DECREASES a tiny bit...and resonant freq INCREASES a bit. Jim VE7RF

I found a couple of identical .85 uf oil caps... pulled from microwave ovens. I measured each one, and #1 is .880 uf. #2 is .892 uf In series, they total .442979684 uf . When placed across the 127 lb

Just wondering if anyone has a WD7S Triode Control Kit that they would be willing to sell.? I am 80 years old and building my last 8877 QRO amplifier and would like to incorporate it into my build.

Hello jim.thom@..., Thanks Jim, very helpful, work has sidetracked me for a while but I will post back as to what i find but I don't think my Hi-Pot tester goes over 8kV Best regards, Chris