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Many years ago when I owned an early TR-4 after reading the manual it became clear to me that anytime I needed to tune up on a band or another band segment I would ALWAYS go to the "X" position for

As a follow-up, this must've been operator error. I just checked and I can get output on all three 10M bands. It's only about 60W but I think that's not all that abnormal. Barry - N4BUQ

Thanks, Peter. I’ll have a look. Paul, W9AC Sent: Wednesday, April 2, 2025 2:01 PM To: [email protected] Subject: Re: [DRAKE-RADIO] TR-4Cw-RIT Paul: Check under the sub-directory of "VERSIONS".

Yes, I checked those. They all were probably quite close and I tweaked them to make sure. All three 10M bands are quite close in negative voltages and the frequencies are extremely close to what they

Mark Yes, good solutions for the fans and keeping the mains out and a simple switch to override the soft start resistor. Nigel [email protected]> wrote:

Paul: Check under the sub-directory of "VERSIONS". That's where there are three files that refer to the TR-4CW/rit in my very early K4OAH "CD". 73 Peter VE7PS [email protected]> wrote:

Tnx PS! Tonight when I come home from work I will try to look at the +10, ground, injection signal and the RIT hook up wires to see if everything is correct. It’s gotta be something simple. Mark

As I recall, there’s no TR-4Cw/RIT manual as such. I’ve been relying on the non-RIT manual with a two-page RIT addendum. But if I’m wrong…I would sure like a copy. I do have K4OAH’s TR-4C

Gary, frequently the problem with the upper 10m bands could be that the xtals aren’t there. If you have all three 10m xtals, look in the alignment section on aligning the three band oscillators (L1,

*versions of the 4-line PTO's I had not heard this before. That's a staggering amount of engineering changes on a relatively small (important) circuit element. John K5MO On Wed, Apr 2, 2025 at

I’d seen this before. Accessing it from a phone is fiddly and if I’d remembered it, I’d have gone to a real computer to grab it. Thanks for finding it! Steve Wedge, W1ES Time flies like an

Good point Jim.....the zener is there (D6) in the late TR-4C's, and probably the TR-4CW's, but it's not in the TR-4CWrit. My bad. I recall Garey telling me he'd documented over 40 different

Thank you for that attachment. I'll give it a closer read later but the last five pictures are quite helpful. I think what I mostly confused myself was that I didn't have a key inserted so switching

Craig, The "sagging" plate current or RF output effects you saw are evidence of a soft tube somewhere in the transmitter chain. If you have a tube tester, you can try lowering the filament voltage a

Sorry, I was thinking T-4X and the TUNE mode.. Attached? is a WA8SAJ article that really explains the TR-4.. 73, Gary WB6OGD

Chances are that it’s only one tube. I have a TR-4Cw RIT that’s doing the same thing and I’m going to need to swap one tube at a time until the problem stops. Keep in mind that it could also be

Not dumb at all.? I did the same thing when I first dug into one of these Drake transceivers.? Your sideband filters may be OK.? These are very broad filters and thus sound great on the air if they

How do you determine that your final tubes are near EOL? Currently when I tune up my T-4XC, particularly when I peak the "Load" control I have to perform this really quickly to get a peak, because iP

Thanks, Jim. It isn't critical for me. I'm just wondering with the end goal of making a similar receiving-only tuner for non-ham bands. Barry - N4BUQ

I reckon that if the sideband selection was fully in-line with the reality of our conventions that they wouldn’t have needed the lamps and we would be simply selecting manually — like with the