I am planning a refurbushment job on a Collins 30S1. Does anyone have any recommendations? The amplifier is in very good condition and will only take some minor work to get it running. However, I wan
The 4CX350 also requires a different tube socket. Some quick questions for the reflector. I just purchased a Dentron Clipperton V 2meter amp (still waiting for its arrival). I have a new 4CX350 tube
It's part of the Joint Tactical Radio System (JTRS) acquisition. JTRS radios are software defined. Crypto is not hardware implemented, it's software implemented. It's the same kind of modern software
ETO Alpha 374 Bandpass Linear Amplifier. Serial number 3159. Rated at 2 kW PEP input Three new 8874s, date code 9525, less than 10 hours on the tube filaments. Gets full rated 1,300 Watts output. $13
Bud, It may be just the extra coax you are putting in the line between the exciter and amplifier. As you said, the SWR goes up as the frequency goes up. At low frequencies, the amplifier and coax rep
I too would like the service manual if it exists. Bob K8MLM 4K Ultra owner _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
Has anyone made a replacement CB-2 Bias control board for the ALPHA-77 or a conversion to passive bias? Thanks, Bob K8MLM _______________________________________________ Amps mailing list Amps@contes
I've seen the same kind if light emitted from a 4CX250, blue in this case. The blue glow turns on and off with modulation peeks or CW. Bob K8MLM _______________________________________________ Amps m
There are 3 modes of heat transfer; -radiation, -conduction and -convection ... where a moving fluid (air) carries the heat away. The convection mode of heat transfer comes into play for the heatsink
Bob, It's actually an infrared heating element. Bob In a message dated 9/5/2006 9:43:14 P.M. Eastern Daylight Time, bmaser@tampabay.rr.com writes: Does anyone have a source for a step start resistor
There is an easier way. Attach the shop vacuum to the top of the tube and work on the bottom side. That's how I did some under side work on my Alpha 77. But in this case I hooked the shop vacuum to t
Not quite true. Look at MLI-B-5087B, Military Specification - Bonding, Electrical, and Lightning Protection for Aerospace Systems and the FAA Lightning Protection Handbook, DOT/FAA/CT89/22. My copies
Yup... they sure do with big flexible double 00 flexible bonding connections... the bonding cables are inside the wing structure where you don't see them. Composites are a problem in some of the new
Concur.? 4CX250s also glow blue. Bob K8MLM Every Commander amp that I have added QSK and vacuum relays to has had the blue glow when looking through the cooling fins.. The three holer on my desk, wit
The other day I heard a poof in the Henry 4K-U and it tripped the mains circuit breaker. I opened it up and looked for something burned or smoke smell and found nothing. Then fired it up for test. Ot
Does anyone know a good source for 8877 pulls?? Thanks, Bob K8MLM Woodbridge, VA **New year...new news. Be the first to know what is making headlines. (http://www.aol.com/?ncid=emlcntaolcom00000026)
Hus, I ran three 4CX250Bs in GG, zero bias in a home brew AMP. That was before I knew it wasn't supposed to work, but it did. I was able to get about 800-900 watts out with 100 watts drive. Bob K8MLM
Ive salvaged several power tubes using 120VAC and a 200W light bulb in series as a current limiter. A bigger bulb would be better but I used what I have. Carl KM1H ___________________________________
Has anyone had success with this process with the 8877 shorts related to the 1980s heat dam problem? Thanks, Bob K8MLM _______________________________________________ Amps mailing list Amps@contestin
Isao, The normal warm up time for the Alpha 78 is 3 minutes. However, dur to the age of the caps and/or carbom comp resistors in the timer circuit the timer may not work or take a long tome to turn o