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Interesting discussion......! While I don't recommend shipping an AC-4 inside an MS-4, it can be done with reduced risk successfully. I proved that 25 years ago with one shipped that way to a ham in

Jerry: Correct......the load control is always adjusting the LOAD cap as it is rotated, regardless of whether it's pushed in or not. Pushing it in just disconnects the meter as a Plate Current Meter

Listmates, The precautions mentioned about shipping an AC-4 and an MS-4? should be heeded.?? About 20 yrs ago a ham on the west coast shipped to me in Virginia an AC-4 mounted inside of an

Hi Peter, Thanks for these great tips.? Can you help me understand how the Load slide function knob works?? Am I correct that is doesn't matter if pushed in or not, the Load knob remains

Jerry: Yes - the slide switch just switches between Plate Current and Relative Output Power. Rotating the LOAD control changes the loading cap and will result in a change in output....likely lower, if

Hi Peter, I will clean the slide switch and report back.? I have to look at the schematic but does the slide switch only affect meter circuit?? Shouldn't I be able to increase the output on the

Gentlemen, Be sure to heed the warning to remove the power supply and ship separately. Handling during shipping WILL cause the rear corners to collapse and fold. If that hasn't happened over the

Thanks for the info Richard! wrote:

Jerry: Common issue....clean the slide switch behind the front panel on the LOADING control shaft. If dirty, it can affect both Plate Current and Output readings. Spray some De-Oxit D5 into the switch

Your analysis makes sense. I assume you have an external power meter of some sort. Can you take the cover off the unit and inspect what is happening with the Load/Relative Power knob? With power off

I am a Drake newbie and have a TR-4C that was gone over by an expert and working well prior to shipping. Here's what I am seeing when tuning up at 3.6 MHz: * I begin with Load and Xmtr gain knobs at

Keep in mind that the side tone comes up the anti-VOX line from the transmitter. The Anti-VOX gain is also the side tone gain. Its usual for it to require a different setting for CW than for SSB. I

IMPORTANT: If you sell this take the AC-4 out of the speaker box and pack it separately. If you ship it assembled it can break loose and destroy the whole thing. Two separate boxes, one for the supply

Thanks sir!

I have an MS-4 w/AC4 power supply that I bought at a hamfest last year with the intent of getting a Drake radio for it but since then my situation has changed and I'd be willing to part with it. It's

George I’m looking for an AC4 I’m ok with something that needs a capacitor rebuild?RegardsTim KD2SC

Ron, I think I have what you want. A few months ago I? moved to a new QTH and am still in the process of unboxing "shelf" gear.??? I'll dig into my MS-4/AC-4 boxes and will let you know.?? I'll

Anyone have a MS4 they will part with reasonably? Does not have to be pretty but has to be complete and work. Thanks Ron W5sum

I don't have the schematic here, but sometimes when I've had audio bleeding onto circuits where it did not belong, I found that the power line into the audio source stage had a bypass capacitor fail

He is more selective and I can fully understand that. I'm still working on these rigs but I'll be on hiatus until August. I'm clearing out what I have now so that I can take June and July off. When