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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 - Steve,

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 volts,