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It certainly is and is exactly what I'm seeing. Thank you for pointing that out! I plan to go through the entire alignment soon. Thanks, Barry - N4BUQ

Isn’t this behavior discussed under neutralization in the manual? Rob, NC0B

Mark: I think the best approach would be to wait until me, or perhaps someone else, can open their TR-4CW/rit and check those two connections, take a pic, etc. I am not able to do that until early

Barry, I’ve found with the TR-3/4 that they don’t 100% neutralise on all bands — especially 40m but sometimes 20m as well. It is unavoidable and the modeling of it is way above my pay grade. I

Hi Barry I usually just tune for the dip, and ignore the possibility that there are incremental power gains that might be had with further tuning. The small additional power didn't seem worth the

I don't think I've ever owned a power meter and now I have one in my MN-2000. Tuning up my TR-4, I notice that maximizing the output power doesn't necessarily coincide with the "dip" in plate current

*Sold:* After I purchased my R7 receiver I began the search for the connecting cable from the TR-7 to the R7 which would allow transceiver operations.? I had no success and had just about given up

I stand corrected. The difference between a tech (me) and a trained engineer. Having said that, the sweep tubes will stand up to a lot of use, as long as they aren’t abused. Having also worked on a

Here’s how I “Identify” soft tubes: /g/HeathKit-HFAmps/files/PA0FRI%20Tube%20Reconditioning%20Circuit 73, Ron AF5IV

Stan, I’ll have to check the serial of my newer one. I don’t know when Drake changed over but it was definitely late-late serial. I now remember that they behave the way this T-4 (and all

I have changed the CO portion of alignments of both the TR-3/4 and T-4 (any) to “sniffing” the CO with a nearby wire connected to my IC-7610. I used to use my Elecraft K3/P3’similarly. I set the

Nigel, Have you tried splitting the high and low current power rails as described by GW4ALG? The PS7 is actually very well regulated. https://www.4alg.uk/radio/tr7/mods.htm "nigel patterson G3YDT via

Sorry Peter you did tell me where the RIT wire goes. I forgot. Sorry! On the PTO output signal, where does that go on the rig! Mark

I didn’t get a chance to check yet. I am just so tired from working all day. But soon I will check! Question: I am having trouble looking at the PTO schematic for the TR-4CW/RIT and trying to figure

Jim Thank you for bringing that info on the huge in-rush and the solution to my attention. Brilliant fand from Stefan, so it must be good. I did not know that this type of thermistor existed. With

Hello all, ‘Somewhere’, years ago, I read ‘something’ about the typical sweep tubes, stating they were being used WAY beyond their ratings. It was because of SSB duty cycle of ~18% that they

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