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Hi, Ed, Yes, I will replace those capacitors. This is a little different than the usual recap in that those old capacitors are part of the visual appeal of the underside of the unit (does that

Maynard there is a bit of stuff here Rr the R26 and others https://armyradio.com/command_sets_list_of_differences.html I am visitor no See also

Could not speak to who influenced the design of the Command receivers but a word of caution. If you have followed their history, be aware of the likely failure of those neat looking can bypass

The ProgRock2's are $18 each (same as the QRP Labs site), and shipping is $5 (total). I ship stuff in little boxes, rather than padded envelopes, which raises the cost a little but nothing arrives

Hi Guys, In the instructions it says to connect a .1mfd capacitor to pin 1 of the 7F8, do I leave the tube in circuit, or put the lead directly in the socket? Should I remove the chassis side cover,

Steve, that sounds great. I’m not sure how the Beckman will respond to a square wave but it’s certainly worth a try. I would like to buy 3 of them. What is your preferred payment method and what

I bought my first piece of radio equipment in 1957 at age 14, an R-26/ARC-5 command set receiver. I still have it but haven't used it for years. I'm pondering working up a power supply for it to get

Justin - you did the right thing in that SB-303. The number of frequencies that can be readily switched with the ProgRock2 is a maximum of eight. Technically it can output 24 pre-programmed

Oh, I received and SB-303 last year that had a lot of dead crystals so replaced them all with an Arduino andsi5351 module... /g/heathkit/message/7651 -- Justin B. KI5GKD

Steve - I don't subscribe to ER so would it be possible to e-mail me a copy of your article or post it here? 73, -- Justin B. KI5GKD

Tom, I keep a fairly large stock of the ProgRock2's -- if you need some and don't want to wait for delivery from Turkey, just let me know -- you can buy them from me at the same price listed on the

Hi Steve, Thanks for the quick reply and the offer to help. I have a complete collection of the ER magazines (have had a subscription since ER#8) and enjoy it more than any magazine I receive. I will

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