Is the location of the glow important? I used to see Blue glow on the inside glass of 4-400A amps, and was once told that this is normal, and not indicative of Gas in the tubes. It was some kind of i
It may be easier to find a 11.5 volt normal size zener and use a power transistor to get the current... I think the Handbook has the circuit, to make a high current Zener from a 1 watter... Pat AA6EG
If the detent is not enough to get your attention, try a wide rubberband installed on the knob edge. The rubberband should have such a different feel that it should almost bite you, if you touch it w
Sometime back, I had a problem with an FL 2100, I dont know the series, but it really opened a can of worms (problems of design) to the FL 2100. My first symptoms were a cracked 2 watt carbon series
rlm Said: ** The problem is not with the 811A grids, it's melting holes in the 811A plates/anodes due to the increased velocity of electrons because Collins Radio used more than the rated anode V. Th
Re HV fuses: I have seen in the literature descriptions of a HV fuse made by inserting into the B+ line, a 30 guage Cu wire approx 2" long. suspended between two ceramic standoffs in the amp. Would t
Folks, This Saturday is Radiofest, in Monterey Caifornia See http://www.radiofest.org I am bringing to sell, the HF Spectrum Analyzer owned/used by Bill Orr, W6SAI (SK) for HF amp Distortion analysis
Folks, I found a source of high quality sheet aluminum. Check with your local city or county corporation yard supervisor, and ask about scrapped signs. They replace old, aged signs when they are no l
Hello Eduardo, Google "Amplifier +813" and you will get a lot of sites with 813 amplifier details. http://faculty.frostburg.edu/phys/latta/ee/wing813amp/amplifierpics1.html Here are some sites: http:
I think there might be difficulties getting to 10 meters for the output netowrk.. for a pair of 813's due to large plate capacitances. 73, DX, de Pat AA6EG aa6eg@hotmail.com; Skype: Sparky599 Moon or
Hi Roller, (Hmmm do you notice Americans REALLY smile at you when they greet you? I found some photos of the bottom chassis area of the SB 220 on the web: see: http://www.bcdxc.org/images/sb220_grd_g
Cast Aluminum Eimac Tube Socket, with pressurized air port bkiw through conneciton... Unused, Great Shape. Heavy terminal lugs Fits 4-1000A, etc. $80 +ship Pat Barthelow aa6eg@hotmail.com http://www.
Folks: I was just about to suggest that any potting or sealing of the open frame transformer would SIGNIFICANTLY decrease it's heat shedding capability. but Carl covers that in his final comment belo
I am guessing a parasitic high Q (narrow band) mechanical resonance of the chassis/cover.... Excited by the 60 Hz mains frequency through the transformer, mounted to the chassis. Refabricating the co
Well, I've got a bit of a problem and would like some opinions. Another ham tried out one of my 4-000A tubes and reports the following: Filament fine, tube lights up fine e ran it with filament only
Folks: I grew up in the early era of Mr. Wizard, Renwal Electrostatic Generators, crystal Radios, and Heathkits. I know the TWO distinct differences between an 807 and a 1625 tube. I also know an ARC
Hi Carl, and group: One, the 807, comes in a metal envelope, liquid cooled configuration...(:>) ....rumored to add DBs to signal reports, and bring in larger crowds to antenna parties. A lot of the o
I found a great series of GPO books covering the WWII era, Signal Corps, in all its aspects, particularly the trials and tribulations of spooling up, producing the huge amount of telecom technology h
I guess Radio Ops on the ground on Tinian or Guadalcanal, Wake or Midway, mustering their big wing of B-17s/B-24s doing pre mission radio checks on the ground with the aircraft fleet, were often in i