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My SN 27844 has a 250VDC can cap, too. Guess that was OEM off the assembly line for TR-4’s. Never noticed the modest 250 VDC rating on the cap nor pondered its significance. My purchased new in

TNX for the info. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/) secure email.

Thanks Rob! 73 Stan KM4HQE

The TR4 in my possession, sn 27xxx, has a Mallory can and it says 250 volts.

Finding authoritative information on electrolytic caps is difficult. At least one respected handbook I have says that because the dielectric is formed by the voltage across the cap that electrolytics

The first paragraph, I left off that the other sets I have purchased already had had their can caps replaced with Hayseed parts. This latest TR-4C didn't get to catastrophic failure but it was about a

For some reason, I was noticing that I have either replaced bad can caps in all versions of the TR-4C (including Cw, with and without RIT). I have a pretty good idea now why this has been happening

I don’t know about the balanced TR-3 filters, but the unbalanced TR-4 filters are 120 ohms. R-4C plug-in filters are 50 ohms. I believe T-4XC filters are 500 ohms. Rob, NC0B

Hi All, I was wondering if anyone knows the impedance of the IF filters used in the 4 line transmitters and receivers??? A search of this group seems to indicate the TR-4 has 2,000 ohm impedance

*** Spray it - sparingly - with DeOxit and exercise it. - Jerry, KF6VB

A pair of 8122 should be easily capable of a kilowatt+ on VHF. Probably grid-driven which means low drive. 8122s are not hard to find. With careful shopping you can pick up good used tubes or NOS on

Beautiful looking homebrew amp on qth and made to match the 4-line. ad# 1682503 He is changing the ad to show correct tube numbers to 8122's KL7AM

OK Gang, I think I got it I think it's the PBT switch. when I operate the switch sometimes the controls will start acting normal. I am going to work on the controls some more. This TR-7 was a flea

Gary, I think you have hit on it. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

OR try turning OFF PBT. If the radio PBT is on, the mode selector switch will have no impact on received signal. Gary W0DVN

Don, On receive, turn on PBT and verify that the front panel PBT control is working. Tom, AG9X

I think so nobody has told me i am transmitting DSB

I don’t have a fix but just to clarify it must be transmitting in the mode you have selected? Dan K9DTC Sent: Thursday, April 11, 2024 9:56 AM To: [email protected] Subject: Re: [DRAKE-RADIO]

That sounds reasonable to me, thanks? so how do i fix it. The TR-7 manual says (I think) that the filter trims off the unwanted sideband. This is what the trim pots are for . To set the pass band?

If you are on 40 meters listening to lsb and you flip mode switch to usb the sig does not change flip to cw no effect. The only position that makes a difference is AM.