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Pete - That was me!? I just noticed that I accidentally ordered two copies but only need one... 73 Justin B. - KI5GKD

TomThat is interesting.? The tube manual indicates that -3 volts should be there.? Have you replaced C5 and C8?? Minor leakage in either could cancel the expected negative bias on G3 of the 6K8.?

Don, here's a photo of the underside in its as-found state. Not too bad but not something a sane person would plug in and turn on without at least replacing the electrolytics. Obviously it had seen

Thank you, Jim. The 6K8 control grid (grid cap) measures 0.00 vdc, pretty much as expected. Tom

No need for a deposit.? Here is my email address where I can send you my addesss: dwight_talley@... Sorry for the late reply. Dwight

Tom, did you mention what state it was in when you got it.. as to the components around the 6K8 . original looking? … or otherwise? Any mucking by somebody could have moved a connection….

Jim, interesting stuff but I wonder, after your bold part You seem to have forgotten to emphasize “but in most designs the frequency shift caused by one is offset by the other so that good stability

Thank you, Jim. I will measure it and report. In the meantime, I just got back from a big swap meet and need to dig out from all my new treasures. ? Tom

TomThe following is excerpted from QST, February, 1941 "The high oscillator transconductances of the 6K8 and 6SA7 make them particularly suited for all-around usage. They oscillate strongly at high

Justin: I didn't recognize your name in my initial response. I indicated I just finished a manual for a HE-43C. When I was putting the mailing label on the envelope, I realized it was for you. So it's

For what its worth - the Lafayette mechnical filter Part Number in the HB-600 is 1253-24. Pete, wa2cwa On Sat, 8 Mar 2025 17:35:22 GMT "k2orsfan via groups.io" <k4pf@...> writes: Hi,

Lafayette HE-43C is not rare. It is identical to the HE-20C (which we sold 1000's of these sets - HE-20, 20A, 20B, 20C(relay and electronic switching versions), 43C) except the 43C works on 110V AC

Bob, Thanks for the tip, but no such marking on mine. Ray, W4BYG

Hi, re: your Lafayette HB-600 CB The Kokusai mechanical filter might be repairable. A common failure mode is that the foam plastic originally used within the filter case to dampen mechanical shock has

Justin – The likelihood of DC going through it is even greater if it is solid state. You just have to verify that DC still goes to where it is supposed to when you install the ceramic filter. 73 –

For what it’s worth I converted an Eico CB transceiver to 10 meters (29.6) many years ago. It was crystal transmit and VFO receive. Not sure, but if I remember correctly, it was a model 761. Mike/

This may help if your bad filter was made by Kokusai:https://kwradios.ngunn.net/IF%20FILTERS/Kokusai_Filter_Datasheet.pdfIt seems that the insertion loss is pretty much the same as the Collins

Mike - It's solid state so no tubes or HV to worry about.? I've tested low-pass filters with my Nano VNA a long time ago and seem to remember that one channel is hooked to input and the other hooked

To rough test whether the mechanical filter is working, jury rig a .01 Mfd cap disc capacitor from filter input to filter output. If volume and noise perk up, filter is probably bad. Since I worked at

Hi Justin – First, I suggest you verify that the mechanical filter is bad. Easy enough to do with a signal generator and a scope. Try to match required in and out impedances with resistors. You