That is why you should keep the shield on it. We use RG 59 for up to 5KV DC. 73 Bill wa4lav I have used RG-8 inner conductor in many many HV applications .. just the insides.... worky worky, never a
A Silent Key's estate contains a 2K-5 converted to a 3K-5 per the SK's notes. It now has a 8877 ( from a MRI) in it. Are details on such a conversion available so that I can check over his work befor
The amplifier with 4 807s was a Gonset 500-W. Grid driven amplifier with 750 volts on the plate and 375 volts on the screen and tuned grid. It had 275 watts PEP output. Not very much by today's stand
No one is picking on you. Us old guys were always looking for a way to build cheap stuff. This was an unusual approach. If you did not want to modify the 1625's you could use 837 tubes instead (chang
My EIMAC data sheets even thought it does not specify a heating time, "--" where a value would be listed, for the 4CX250B or F (listed in same data sheet) said that it recommends that heater voltage
The problem with a grounded grid or any RF amplifier that has a non-linear input impedance ie non-resistive is that the exciter is not loaded with the same impedance during the entire RF cycle. This
There are resonant pi networks and low pass filter pi networks...... These are resonant. If you perform a frequency plot of the output vs the input you will get a small signal up to the point of reso
Well, lets see.... If you have a filter with a center frequency of 1 MHz and a Q of .5 then the cut off frequency would be 2 MHz and lowest frequency would be Zero by the definition of Q= Center Freq
Are any of the group going to Dayton? If so are you bringing anything interesting? I'll be at 2904 and 2905 if you want to stop by and visit. 73 Bill wa4lav
The previous email about building a 4-1000A amplifier reminded me that I still have insulators. I have some 6" long and 1 " diameter Ceramic insulators that I will sell in multiples of 5 for $30 whic
But it will bring a great deal more on the market than any Half KW modern day amplifier. Also, it will operate any band from 80 to 10 meters using passive input including WARC bands and any new band
I have been put in charge of selling a bunch of stuff for our ham radio club (Bluegrass Amateur Radio Society) that was taken from a TV Broadcast Transmitter donated by WLEX TV here in Lexington. I h
The phase relationship between voltage across and the current thru a true inductor is always 90 degrees. It may be less due to series resistance in the inductor but in an High Q inductor it should be
One near by lignting strike and all 16 transistors are gone. Besides they don't glow. 73 Bill wa4lav NB: What I know about solid state power amps can be written down on less than one sheet of paper.
Maybe he ment to use them in an amplifer for switching AC such as filaments or B+ but was concerned about the effects RF may have on them.. 73 Bill wa4lav These are usually designed to switch 60 Hz l
I would expect the shot noise from the random arrival of the electrons (shot noise) on the anode would create so much noise that you could not hear any stations at all. That is one problem with elect