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Hi Richard, I remember talking to you about this some time ago and some of your suggestions were very useful. I am still at a loss to understand how you get full power out of yours with a dynamic mic?

I think of the shields as more about heat removal. It's a bit different seeing Drake install unique tube sockets that accept heat shields and not expect a shield to be put on. I'll leave all 3 of mine

Mike Bryce writes: Yeah, I have a couple dozen of those projects on the shelf, slowly turning to dust :-( I had a general idea of how the RCS-4 worked internally, I've just been missing the control

This "low tx audio" takes me back to when I acquired my first C-line. When I got it home and fired it up it was full power on CW, but I could never get more than about 60 or 70 Watts out of it on SSB.

Re: TR-7 Plastic end caps for front panels... Looks like Mike March's website is no more but you can e-mail him at; mikek4qu@... At one time Mike had all 3 sizes needed for the 4-line gear

Chuck: V-11, V-12, and V-15 should have tube shields on them. V-6 and maybe V-7 have tube shield sockets but do not require shields as Steve stated. Check the picture of the chassis top in the manual.

Just following up to the group. I think both my transmitters are doing fine. I had two issues (operator error). I didn't realize that the T-4XC reduced power in tune mode and I wasn't using the best

Those shields aren't needed except for one of the 6BZ6's, IIRC. The reason is that the shield mount has sufficient shielding without adding a shield. Check the manual to see which tube needs a shield,

Hi…. the switching voltage is AC and runs about 27ish volts. The remote part is nothing but a small AC induction motor that spins a shaft a coax switch is mounted to. IT’s really simple. several

All I can say is my T4XB modulates just fine with a variety of dynamic mics as well as a couple of non-amplified D-104s.? My usual mic is an Electro-Voice 664.? How are you folks determining "full"

I’ve never noticed a difference, Peter. 73, Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from Proton Mail for iOS

Jim, thanks, that's exactly what I was looking for. Just like the RCS-4, the doc is silent on the switching voltages. And they don't give a part number for the transformer to look it up. The solution

I have a very late TR4-CW rit and on TUNE, can get around 205 watts out according to an Array Solutions, Power Master II and I can bury the meter in the 200W scale on my W-4. I also have a "C-Line"

Well, I have a pair of nice (not perfect) end caps. However, even though people seem to covet them, they only want to pay me $5 for them. Not worth my time… Gary W0DVN

Is there a basic difference between 4B and 4C line front plates as to colour and gloss? The front plate in my 4B line has a slightly greenish, glossy touch, whereas my 4C line is in different shades

Mike March. Google March keys. He makes excellent replicas. 73 Peter VE7PS

I need a pair too. Ya know.. we need to find someone with a good pair, and get someone to duplicate them on a 3D printer!! THAT’S THE TICKET!! Ron W5SUM Sent from Mail for Windows Sent: Monday, May

Jerry, I used paint from a can poured into a roller tray. To Gary’s point below, I used Rustoleum because that was what was available at my local hardware store. Agree there was nothing special

I am looking for a pair of front panel end covers in like new, or better, condition for the Drake WH7 wattmeter. Thank you. 73, Michael, N4KZO

Hi Bill, I have experienced pretty much the same with my T-4XB. After spending hours going through the Mic amp stages, replacing the 12AX7 amp etc, the only microphone I have that will modulate this