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We have an EMI amplifier (IFI406) with 24 4cx250s in a TWA. one of them has a short between G1 and cathode. It comes and goes with heat and when it happens the plate supply shuts down. Anybody have an

ORIGINAL MESSAGE: wrote: ------------ REPLY FOLLOWS ------------ It really depends on one's manner of speaking and one's individual voice. Some people put relatively large pauses between words and

80-160 meter tankcoil on a large toroid? Rated output is approx. 6 kW Hi Dick, One idea is to use two or three number 10 or 12 gauge enamel side by side wound as a ribbon, connected in parallel. They

Am 27.09.2006 um 03:25 schrieb craxd: Nothing really lost. Using the "history" tab on the page shows who did what with it. You could paste your version again in there... Your text is still available.

What kind of (stranded) wire (or strap) can be used best to wind a 40-80-160 meter tankcoil on a large toroid? Rated output is approx. 6 kW Cheers, Dick PA3DUV

I have done some modifications to the shematic, so i have uploaded an revided shematic. I can't see the reason for floating the B-, to mesure the current i would just add an 0.1 ohm resistor between

The best way to measure a transformer gut temp is measure the winding resistance cold then hot and determine the real temperature rise by the copper constant. I think it is about .4%/degreeC. wa1gfz R

All, I hate to say that some dumb a$$ deleted almost everything I had written except some corrections about the windings. I'd about bet they were the one who wrote the screwed up stuff I had to

During an ahhhhhhhh, I see about 1/3 of A0 anode current. If one transmits half the time, that's a duty-cycle of 1/6.

All, I finally did finish all I was going to do on Wikipedia about power transformers. I found I also had to edit a few stubs and others. The definition of Oersted was completely screwed and they had

Jim, I forgot to add, the calculations about voltage arcing I'm thinking of are for only up to say 3 kVA in size. When you get on up in size, the volts per turn, and per layer can raise due to the

No, the one in mention was Hal Mandel W4HBM. He had Dahl design a transformer for him, and I can't remember if it was a anode or a heater, but in two tries, Dahl got it wrong, both transformers went

different than RTTY. ### Dream On.... unless you chopped all the audio off below 350 hz..... or the plate current meter ballistics are out to lunch. ### see above. [and inte

Hello Thomas, A couple of suggestions for your amplifier... First, I would float the B- to make metering of plate and grid current readily available to you. It takes no more than two resistors and a

A Dahl 4500va-rated transformer

Yeah, that's correct. If you compare them then you would see that I have copyed part's of it. I think that the Ameritron amp. is running the tubes a bit to hard. An other thing i have done is that i

SSB has a duty cycle of less than 20%, so it's quite different than RTTY.

You dont need matched tubes -- just put some resistance in the cathodes and they self match -- rich knows more about how to get the right values of resistance -- im still learning Steven Grant W4IIV

Very good English Anyway I had a Ameratron (sp) AL 811H This was a 4 tube 811 amp. Try researching it for CKT diagrams and ideas. I think the schematic is on the Ameratron web page. la3pna wrote:

Hi group. I'm Thomas, La3PNA and I'm in the progress of starting to build an HF amplifier with 4 811A tubes. I'm gone to use 4 of them because, I got the tubes, sockets and Plate caps for 4. I have