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Hi guys I am about ready to pull my hair out over this modulator, last week it hot plated a tube popped a fuse so I went ahead and replaced the HV capacitors and the 100 uf 200vdc capacitor for the bias. When it first screwed up I put a voltmeter on pin 5 on the 8417 tube and watched the...

Hi guys I am a little confused on this old carbon resistor here, what exactly is the rule of thumb here, which is the first band ? The red ? If calculated like that this would be a 2.23 ohm resistor however it is reading 23.75 K ohms. If calculated the other direction it should be a 24K ohm...

Hi all, I have a Siltronix LA-650 here in need of a plate tune air variable capacitor part # 074-064 and am having issues finding one, anyone know the specs on it or one that would work fine in it's place ? Thanks

Hi, I recently got ahold of a Maco 750 that is in need of great help as it has several issues I am aware of, one of them is, there is a white wire coming from the large capacitors that is carrying 450 VDC that had come off from wherever it is supposed to go ? anyone know off hand? It goes...

Hello, I was wondering if you guys could help me identify these components and or inform me on what type they are ? Resistor, diode, and capacitor perhaps ? But not sure of their types, values or what to call them to order or find them. Thanks

Hi everyone, I recently got a used RCI 69ffb4 and I was wondering what the output on just the radio itself should be without the 4 pill on, anyone happen to know ? Thanks

Hi all, I have a JB12 that has started red plating the 6bq5 tube and I can't seem to figure out why, I have tried replacing the coupling capacitor and have checked the values on the resistors and all seems good ‍♂️ does anybody have any other ideas? Thanks

Hi I am working on a kenwood ts-430s and the radio is not keying up with the desk mic but is with the send switch, anyone know what pins to jump on the mic plug to force this radio to key so I can check and verify it is the MC 60 microphone that is causing the issue, Thanks

Hi, when I key this transmitter up I am getting a 4 watt dead key but no modulation in AM but am getting modulation on SSB, I have seen it recently modulate on am as I was wiggling the 12ax7 tube but has stopped all together, I figured it was a loose and or dirty tube socket so I cleaned it and...

Hi I am trying to wire up a mic for a Browning Mark III and am having issues finding a diagram since cb tricks seems to be down, lets just assume it is a cobra style mic, what wire would go where on the 2 pin jack ? I know they use the chassis ground to short a pin on the jack and it is keying...

Hi guys I am working on this Golden Eagle 1k and I am trying to get it straightened out these seem to be rather troublesome units sometimes as not having 27lf6 tubes available anyways I seem to be having issues with the 27k ohm resistor on the power supply board, originally it had one of those...

Hi, I am doing a tube socket swap on a Hy-gain 644 footwarmer which is going from 8908 tubes to EL509 tubes and am a little confused on where the pins are supposed to go from the EL509 sockets, for example there are 2 G2 on the EL509 " pins 6 and 3" so do they both have to be connected or can...

Well, I got the tubes all converted, installed and everything went very well there now on to the next issue I discovered, apparently the PO of the amplifier ran to many watts into the amp and or somthing else had happened as it looked like a lead on that little metal canister " what ever it is"...

Hi guys I am new to this forum and recently acquired a really clean Robyn T-240D this unit has very good recieve but very poor transmit as it is putting out under a watt, I am in the middle of replacing tubes to start with, does anyone know which tubes in this radio are for the transmit final...