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It lists different transistors and the wraps on the different transformers that go with them.
I think this more lines up with the DX600, but there...
Here is an old schematic I have that might help clear some things up.[ATTACH]
The MRF454 would cross to the 2SC2879. They are not a drop in replacement for the SRF2072 so to install those you will need to rework the circuit.
The MC250 shouldn't have Toshiba transistors in it if it's original and the schematic above would be wrong for it. If it does have Toshiba...
I would start with the capacitors on the transformers to ensure that they are all within spec....cold AND hot. If they aren't, or are and drift...
$600 IS the friend price.
I'd put that thing on Ebay for no less than $800 and see what happens.
If he lets it go for any less than $600, he's nuts.
The only difference that I ever cared about was the early ones went to 29.999.9 where the second gens stop at 29.699.9.
I was never pulled over for a drug search, but I have had a couple situations where I was harassed.
The one that stands out is I was pulled over...
I have no direct connection to this, but good grief this shouldn't happen.
That is where they tested it. No radio or amplifier that uses 2sc anything runs those devices at 12V. Minimum will be 13.8V under normal...
I had some hams messed up because my call is KB9, but I'm in 6 land.
I've been using a cantenna 1000 watt oil filled dummy load for years I even tested my sweet sixteen into it for a short burst and it's still...
Try running a 12 foot jumper and see of that cures it.