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Mark1960 · 3rd Jul 2022, 10:34 pm

Looks like the board was wave soldered as it shows some crinkling of the solder mask. It was probably then cleaned with ultrasonic cleaner before the modulator and regulator were hand soldered. I think this is why only a small amount of flux residue left on the pcb.

From what looks like grounding for shields on the pcb I’m going to guess this is from early to mid 1980s.

As SiloPhd is in Poland I might have guessed Sord M5, but they don’t have a regulator on the main board.

3rd Jul 2022, 10:34 pm	#6
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,294	Re: Rust on the PCB? Looks like the board was wave soldered as it shows some crinkling of the solder mask. It was probably then cleaned with ultrasonic cleaner before the modulator and regulator were hand soldered. I think this is why only a small amount of flux residue left on the pcb. From what looks like grounding for shields on the pcb I’m going to guess this is from early to mid 1980s. As SiloPhd is in Poland I might have guessed Sord M5, but they don’t have a regulator on the main board.