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Hi Lyndon, Mine is a later S/N, 1120.? Here's a no so up close pic of the board in mine. 73 Stan KM4HQE

Great sources. TNX. mgilger_at_charter.net_lastradioman@...> wrote:

Same here. Garry said it was gassy tubes, I didn't believe him but tried new tubes anyway. Fixed it. The amount of gas is so slight it doesn't show up on most tube tester gas tests. My TV-7

YES, even my 13 tube R-4A had fast AVC with a gassey tube! (only until Garey told me I had a gassey tube!). But, the best tubes in an R-4B will still give the too fast AVC. You can tell if an R-4B is

You have my sympathy with your move. My least favorite thing is moving. Done it too often in the past. Right up there with surgery but at least with surgery someone else does it for you. I found the

Richard, I think the Product Detector mod is quite worthwhile. If you've ever used an R-4 or R-4A(13 tube) you will notice its? VERY nice and slow AVC on ssb. You can see the s-meter virtually hang

Good on you, Craig. Glad you got your honey back singing! David Assaf III W5XU, VP8RXU [email protected]> wrote:

Victory! I now have keyed CW output on all bands. * The main culprit was the switched +5V bias regulator U2301 on the final amp board. No + output from this 7805 and switched +13.6V going into it.

That is the cover I took off with the hole itn it near the back of the chassis. Sorry I will take the bottom cover off again and try to do better hi hi Jim Ve1RB [email protected]> wrote:

Found your file and downloaded it to my Drake file. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

No, I never got a board. I am familiar with Rob's upgrades for the R4C but didn't know about the B. The B is really a very good receiver and doesn't seem to need much help but I am always interested

You are probably right but I was puzzled. Both Lionel and ARH keys are good keys, easy to clean. J-38 keys were made by several manufacturers but these two, and Radio Specialties, which is evidently

Richard, Look in the Files section for my file: "Product Detector board instructions.doc" (I should have put a better title on it!) This was for my version of Rob's board and how I installed it in my

Low resistance when the contacts are open, is what I’m assuming what is being described. I have a T-4 that went stuck in transmit but I lucked out — it wasn’t putting out full power. I’m going

Thank you,that would certainly cause problems. I discovered that the key contact resistance could affect the frequency of my Bud code practice oscillator. I began to get chirp from a bug and found

I think he meant that the key was closed, or at least at a very low resistance, when it was supposed to be fully open. Barry - N4BUQ

I don't understand this. Low resistance, ideally NO resistance, of the key contacts is their normal condition. What am I missing here? -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

Where can I find details of Sherwood's product detector fix for the 4B? I have one, which I need to work on for other reasons. If its not an extensive mod, and it really makes a difference, I would

Check out the last page of the following document on WB4HFN's web site. Back To Basics ( https://www.wb4hfn.com/DRAKE/DRAKE%20TECH%20EXCHANGE-2023.pdf ) 73's, Mark, WB0IQK

Jim, you're looking at the wrong board. The picture you sent is of the pre-mixer board. The board you want is accessed through the bottom of the chassis. Open the radio on its back, with the rear