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Thomas, I wrote an article last year called "Programmable Crystals to the Rescue", which was published in the March/April 2024 edition of ER Magazine.? That article describes in great detail how a

This package looks great and less expensive than ordering a crystal not to mention the reduced lead time. I opened the QRP Labs manual for this devise and had trouble with programming it for a

Justin -- I keep a good stock of those ProgRock2's, if you decide to go that route I can pop one into the mail to you cheaper than you ordering one from Turkey (and certainly much faster). 73 -

Richard - I tried that on a heathkit SB-301 and baking woke up 2 crystals.? I just got back in from the shop re-testing the TRC-47 and that crystal is still working! :-)? The Comstat 25 originally

What I run into more than anything else are drifted crystals, which can play havoc in circuits such as band-switched heterodyne oscillators and seriously affect dial accuracy.? I haven't tried the

If I understand this the crystals are physically present but have not been working. Yes, it is possible that hitting them with drive from a signal generator may have awakened them. I would suggest

My sickness concerning old vintage radios had morphed into revisiting the CB radios I messed with when I was a young 'un.? I have noticed that several have had one or more crystals out, which in a

Got the manual today, very nice work.? This is the first I had ordered from you and most likely won't be the last. :-) 73, -- Justin B. KI5GKD

The only component not replaced is a large-ish mica cap buried under the LO coil assembly. I will get to that in a day or two after gently lifting the coil assembly. Tom

TomThe two original paper caps in the LO compartment are the ones that you say are still there and need to be replaced? What C# are they?Jim Logic: Method used to arrive at the wrong conclusion, with

I got on the air for CX Phone this evening and received a couple interesting questions.? One was wondering why I was CQing on such an odd frequency such as 7205.525 kHz and another asking if it was

Jim & Tom The Hexode signal grid has a max? or min? voltage of -3 presumably to the cathode [depends who you read] , but my conclusion from a Sylvania blurb is that it can go as positive as -3

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

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