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If he's not in the US he most likely has the "export" version with the PC-999 board (or a variant of it) that has 3 bands, FM, and a roger beep.

I got mine in 2006 or 2007. It's a black face with green numbers (inverse of yours) and I have the newer microphone. So that would make it sometime between the mid 90's and then. I'm not sure exactly when they started the DX change over, but I have an earlier black faced one.

It doesn't look like anything special, just a 2 wire A/C power cord.

Quick... Is this the old one or the DX? (for clarity)

I know the circuit boards are marked 1988. 89 seems to be when I first started seeing them in my area.

That's what the schematic shows.

According to the schematic they are 1N4148 diodes. This looks like a prepackaged piece for easier installation.

Here is a paper from Texas Instruments on the diodes. https://www.ti.com/lit/an/sboa277a/sboa277a.pdf

R131 is the AM modulation limiter. Q24 also is part of that, but also controls the ALC for SSB. Changing the other two resistors is also about trying to boost modulation. Personally I wouldn't do this mod, and if it had already been done, I would reverse it.

D89 is the diode across the driver D88 and D112 are the diodes across the finals.

Here is a Galaxy Saturn service manual. It shows the 2166 driver and 2312 finals. I'd lay odd that someone swapped in the 1969s in place of the 2312s.

I think the MD-100 is compatible with it.

The movie Frequency. The Ham radio that was used as a transceiver was only a receiver, a Heathkit SB301. They routed the mic cord to the back of the radio to hide that it wasn't a transceiver. The fact that there wasn't a PA section inside the radio when it was damaged was a MASSIVE clue if you...

Minuteman II mic? If so they take a TR175 7.5V battery, not a 9V...

It's not that tricky because by 1989 they had moved production from Taiwan to The Philippines, so it's easy to figure out the year of manufacture.

I miss the old days when the radio came with the schematic.

Yes. The AMC is wide open at that point.

3.5" cd? Any CD ROM will read it.

You should use the radio to vary the output, not the amp. The variable in the amp will fail over time. Conversely you can measure the resistance where you have the 100 watt deadkey and replace the variable in the amp with a fixed 5 watt resistor and that will be much sturdier. As far as the...

I have never been that much of a fan of driving 2879's with a 2879. The 2290 takes a bit less to drive it, but is a slightly lower output device. For me I'd want the 2290. Others will disagree with me.