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There are adjustments on the board to calibrate the multipliers. I have compared a 50 watt multiplied and a 500 watt next to each other and they are spot on with each other. You just need to make sure the calibration is correct.
Also there is the possibility of one of the slugs being out of...
Any scans I can find of the schematic for the radio look like they were scanned with a potato. That makes it very difficult to figure out the wiring. Also I don't know if the D104 is compatible with this radio.
I don't know that I would want that on the factory heat sink. It really wasn't designed to dissipate that much heat.
It's an interesting concept to deal with a discontinued part, but I just don't know.
OK, that switch in the underside is for relay/electronic switching. It the mic was previously wired for an older relay switched radio, that will need to be flipped.
This is the wiring for a cobra from an old Turner mic wiring sheet. Look at the 3rd column and you'll see the 25 or the next one...
Since it's missing, you KNOW it's been messed with. I'd say it needs a complete alignment. L45, L46, L47, L48, and L38 are together in the transmitter alignment section. My guess is they all need to be looked at.
Here is the service manual...
The Galaxy Plus is almost the same radio as the saturn and the schematic should steer you in the right direction.
https://www.worldwidedx.com/ims/galaxy-dx-radios-galaxy-plus.224/
If you're talking about the "key test" he did, that's fine. They were tested with a 20:1 swr at Cobra for something like 20 minutes. I can't remember exactly, but I was pretty shocked. It was in the 148 GTL manual somewhere.
It uses the PC-385 main board.
Alignment locations:
https://www.radiomods.co.nz/alignments/pc385align.html
Here is the block diagram from the Uniden Washington with the same board.
It looks like your car radio is a double DIN sized radio. That would allow you to install an aftermarket single DIN on top with the AnyTone on the bottom into the dashboard.
As for your situation... from what I can tell it looks like your stereo tapers down towards the bottom, so I don't know...
This is the mosfet that board is designed around.
https://www.st.com/resource/en/datasheet/sd4933.pdf
It's a 50v device with a minimum of 40v. That's where they got the 1200 watt rating from in the add.
At 40v it's rated at 300 watts per device, and at 50v it's rated at 400 watts per device.
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