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Great. All 4 Line receivers should have hiss that can be peaked with the preselector. All of them. RF gain should be fully CW. AF gain should be midrange. Sometimes, the bandswitch is dirty. Try

Ya, I unplugged that thing early on. Mostly because I didn’t want to whack it and break it. I only had it in the picture to show y’all what it looked like.

Two comments here. Rule #1 of vintage radios: Never leave them running unattended, ever for "just a minute". That's all it takes to smoke an unobtanium part if something goes sideways. I'm not

Ryan, upon reviewing the schematic, I'm going to recommend that you unplug the 4-LF from the accessory socket. Whilst the socket seems to provide mostly power and ground to the accessory, it also has

Be sure to keep track of which tubes go where. It can make a difference with the alignment. Your transmitter seems to already be working fine. Steve Wedge, W1ES/4 Time flies like an arrow.? Fruit

You are correct, Steve, I have already put power to it. I’ve ran it a few days, mostly letting it just sit there under power. I had to box it up today because I had two welding jobs holding, waiting

Which brings up best practices. Always check the amplifier keying voltages/currents against the ratings of your exciter. As shown here, even within a brand with two models that are still in production

I believe that Ryan has already fired everything up, so no variacs are needed at this point. A view of the top and bottom of the chassis will be helpful. There are few mods done to the earlier Twins.

It is surprising to me (shouldn't be) how much confusion there is about AM. For one thing the term "distortion" means different things to different people. In almost prehistoric times, like the 1930s,

Rob, don't put too much effort measuring the sensitivity of your TR-4C and R-4C . If you hear an obvious increase in the noise level when connecting the antenna to the TR-4C in the AM position, while

Thanks folks, Indeed, the TR-4C doesn't seem to be the ideal rig for AM. Luckily I also have the 4C twins, and the R-4C does AM very well. ?I could accept the 'distortion' caused by squeezing AM

There's one thing that maybe should be kept in mind about what people may be using to drive their L-7 or L-4 /L-4B when it comes to ICOM transceivers. I'm not sure that everyone who uses ICOM radios

*BUT PLEASE start a new email* with the proper subject Bob. Thanks Jim W7RY -- Thanks and 73, Jim W7RY

Ryan NV5E writes: Ryan, if you can, pop the covers off the tx and rx and get some (high resolution and well lit) pictures of the top and bottom chassis of both, then post those to the list. Just by

Bob, you're in the right place! Question away! John

Well hi y’all I see the discussion is about Drake HF radios I was directed here to look for assistance with a Drake UV3 So once again I will ask can anyone refer me to the correct group? Thank you

I would toss the silly 1/2 wave rectifier and at least use a FWB? or a FWD, depending on the application.? ?That 22 ohm resistor is not going to do much to speed up the RLS time, it's value is too

Yes, I measured my keying line carefully before hooking up my first solid-state transceiver to my L4B.? The keying line had a measured 60V spike caused by the relay coil. I chose to add an

When I first hooked up my IC-7610, I measured the voltage on the L7 before connecting and have been using the pair since I bought the 7610 last year. I also checked the rating of the 7610. Use the FET

Jim that's good to know. Thank you for that information. Joe ki5o