On Mar 10, 2023, at 11:21 AM, Jim Shorney <jimNU0C@...> wrote:

?
I suspect the difference is largely cosmetic. Drake started using boards with solder mask in later years. These will have a green coloring while earlier boards are bare tinned copper. A surf of eBay offerings confirms this. Other than the solder mask and packaging of some components they look pretty much the same.





73

-Jim
NU0C

On Fri, 10 Mar 2023 06:34:46 -0800
"Dave Cutts via groups.io" <g4faw@...> wrote:

Thanks Rob,any idea where I can get details of it? my manual only shows one version, Its very similar...

Thanks Dave G4FAW

Just finished the AC4 Harbach power supply update and wanted to pass on my comments.

The kit arrived in a small box and included two assembled boards and a small bag of parts and hardware. The assembly went great with instructions available at the Harbach site. The instructions are basically Heathkit style and if you can follow directions, can solder, and have the rudimentary tools needed then you are good to go. I did most of the assembly in one night, but had to wait for the power cord gland I had ordered. The gland method of power cord restraint works very well. The only problem was the cover lip at that location was too long because the new gland was larger than the original wire strain relief. I just broke off the lip, which meant that the screw position could not be used. The bottom cover has many screws, and one missing is no big deal. I have not updated any other Drake supplies or used other products so I can only speak for this design and if I had it to do over again, I would not hesitate using this one.

es4ac-4ac $74.95




Photos show original supply and updated supply shots, as well as parts removed.

Doug, WA3DSP

Jim,

Is the?attached better than?yours?

Ken

WA2LBI

On Thu, Mar 9, 2023 at 2:51?PM Jim Harris <radiove1rb@...> wrote:

Does anybody have a good clean clear copy of the schematic for the TR5? Or maybe a place I can download one. I have one but when you blow it up the resolution is terrible as lines are missing etc. I am trying to get the tranmsitter putting out power. I have already installed a new pair of matched finals as one was bad and now I have found that the RX/TX, TX mixed for the transmitter was bad and the 2N4427 had a base to collector short and that took out the base resistor. I have a couple new transistors but would like to make sure there are no other problem around the TX mixer. Thank you.

Jim VE1RB

Gregg,

? Look through these messages and you will see the Mouser part, but also check out the other cheaper part mentioned further down. I ordered the Mouser part before I saw the later message. The Mouser part works with standard computer style 3 wire cables, but not the extra heavy ones. They are a dime a dozen. I just cut off the end that goes to the device and use the pug and cable.

/g/DRAKE-RADIO/topic/ac_4_three_wire_power_cord/97321404

Doug, WA3DSP

On Mar 9, 2023, at 10:10 AM, Dave Cutts via groups.io <g4faw@...> wrote:

? Hi All,

Are there 2 versions of the TX Exciter board in the TR7? My one doesn't seem to be quite the same as the picture in the service manual.

Thanks for your help...

-- 
From Dave Cutts G4FAW 73s

I would say it is different, say less than 700 hours a year vs. greater than 8000! Why would you need to leave a TR7 on 24/7/365? It doesn't drift. Kind of a waste

Doug, WA3DSP

Perhaps the waterproof lights you selected were poor quality to begin with.? Here is a guide on the different products and IP ratings.



Doug, WA3DSP