开云体育

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

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