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I don't know the dates of these but here are a couple of old ads.

I don't have a radio to look at but if you use an ohm meter you can find which solder pad is grounded. You will have to get a ground point from the main board as the chassis is not grounded directly to the boards in that radio. The ground pad will be on the larger circuit area of the power...

That is the main filter cap for the power supply. If you are running off AC power it needs to be there otherwise you will have quite a bit of hum in the radio. It is possible that someone installed one under the board. I have seen this done before when someone wanted to add more capacitance for...

I know this is a bit old but 357 was wondering about channel skips. I have a CPI 300 that has a switch on the front like that Digicom 100 does and it is for 5k skips. Some one added it to it. Mine also has a different chip that allows it to go to channel 79. I read an explanation a while back...

Here's some info on the 300. Also if the radio has a green dot on the TA sticker on the back it was modified at the factory for improvements for the noise blanker, ambient noise level and modulation warble on SSB.

Here's a schematic for the 60.

Years ago on the Yahoo CPI group there was a lot of discussion about this and no one was ever able to come up with a programmer that was able to read or write to any of those proms or eproms that were used in the Digicoms or CPIs.

Here's a schematic for it. I believe there is a CPI group on FaceBook that used to be on the old Yahoo group. Might find some info there.

Ebay sent out notices to sellers to set up an account with your bank or other financial institutions last year as they stated they were no longer allowing people to pay with PayPal. I kept receiving them in my email and in my Ebay messages until I finally did it. With PayPal it was an instant...

Looking at the schematics C79 should be a .1uf and C108 .022uf. The parts list shows C79 as a .1uf mylar and C108 as a .022uf mylar. The parts list also shows C79 again as a 15pf ceramic. It seems that there are mistakes in the parts list. I would say to go by the schematics.

I once sold the same radio 3 times on Ebay before someone would keep their hands out of it. I got it for partial payment for some work I did. It was a RCI 2980 and was in beautiful condition but didn't work. I replaced a regulator, aligned it and ran it for a bout a month. It worked great and...

Yes. I've seen that in two General Lees before.

I've seen radios do something similar to that when the crystal is bad. They will show the correct frequency and be on that frequency but then at some point the display just starts "rolling" and the radio is not on that frequency anymore until it's shut off and then turned back on again. Then it...

Check out Barketts. He states they are original ones that he sells. RF parts may be a place to check also.

They are a problem in the Trams. I've changed many myself over the years and have worked on many that have had them changed. I always run an old radio for at least a week before I'm satisfied with it and like you said it's always days after you think it's all set to go, more problems pop up...

The difference is that the SAM manual uses TP6 instead of TP8 to take the measurements from.

In the 50 years that I have worked on electronics, 45 of those for major corporations as an electronic tech only a few times did I ever have to change out a tantalum. The last company I worked for built equipment that has been running in their customers' facilities 24/7 since the mid 80's...

You can find the info in the parts section of the manual in case they may not be the original caps. There is no reason to use caps of extreme voltage value in circuits that are never going to see that kind of voltage. Most circuits in a radio do not run at the B+ voltage otherwise they would all...

Here is another copy of the same that may be easier to read.