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How early T-4X? Mine is S/N 10499. My T-4X is on the needs to be fixed list, but I can take a look tomorrow with an open key in the key jack. 73 Stan KM4HQE

Back in the day, I built a linear with 4 6LQ6 tubes ( in an ARC-5 cabinet ). I used Radio Shack "lifetime warranty" tubes, and carefully put the receipt in an envelope taped to the bottom of the

If it's a soup can filter failure is not at all rare.? Just because you have a TR-4 doesn't mean you don't have a soup can either.? You have to check.? Early TR-4s used the soup can.? I have two

Barry, this is awesome. Thanks so much! I have the equipment to do the sweep. I’ll do as you suggested. This TR-3 was not treated well. I’ve cleaned it up and recapped it. I think I will sell it

Probably because sweeps are pulse tubes and are not built to take high levels of average power. The 6146 and such were more robustly built and would typically be used in FM or AM service. "Steve

Have you guys/gals seen this ? https://forums.qrz.com/index.php?threads/drake-r8.950149/ Thought someone here might have an interest. de Jim W4QE

A better soft start solution: /g/DRAKE-RADIO/files/TR-7/PS7-Inrush.pdf "nigel patterson G3YDT via groups.io" <wnigelpatterson@...> wrote: -- 73 -Jim NU0C

Actually, sweep tubes used in TV service, back in the day, were beat upon fairly hard. What you don't want to do, with ANY tube transmitter, is run heavy plate current OFF-RESONANCE. When that is

Working on a T-4 that I sold and has come back for repairs after UPS played Mad Max with it. I can't remember if the functionality of TUNE and SSB are dependent on there NOT being an open key in the

12BA6 RF amp and 6EA8's can affect signal strengths. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/mail/home) secure email.

I have the original manual for mine and it's just a TR-4C with a few added pages and a sticker added to the front cover. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent

Its important not to confuse carrier _balance_ with carrier centering. Both could be affected if the carrier frequency is off. Balance has to do with the amount of residual carrier. Too much carrier

I would echo what Richard said; you can tell if your carrier balance is off if (for example) LSB sounds muffled and USB sounds tinny. Repeat your monitor test on different bands/different sidebands.

You should always tune up FAST for the Drake gear, these are sweep tubes. One way to check the quality of the tube is to set the bias to the proper point and transmit for about 3 minutes or more using

More info needed: is this one sideband or both? Have you another microphone to test? One way of telling if the set is mis-aligned is just to try it on both sidebands. Muffled sounds like the highs are

I have a TR-4 (early model with no noise blanker) that I’ve recapped and aligned to the best of my abilities. ?It receives great and I get good TX output but every report I get back says they can

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