Here is a trick that took way too long to try.
The Potter and Brumfield "R50-E2-Y2" relay found in many 1970s-era Palomar amplifiers has a bad habit of going bad.
It got discontinued and expensive. American Zettler also made one called the "AZ531", but it got hard to find around 20 years ago.
This adapter board has pins under it that will fit the holes in the original circuit board. The chip socket on top accepts a variety of DIP-type relays. The Omron G5V-2 used in the pics is rated for 2 Amps, same as the original R50 part.
Next step is to try one of these in a couple of Palomar 300A amplifiers. A friend across town is picking one up to try in his amplifier. I have a 300A here that will get one of these before the owner picks it up and takes it home to Georgia.
I remain skeptical until I see it work. The square pins on the bottom that fit the original circuit boards are a tight fit in the adapter board's holes. Really tight. Ordered some thinner ones to try, so don't expect it to get marketed any time soon.
Just the same, thought I'd show it off. With luck (and money) it could become available eventually.
73
The Potter and Brumfield "R50-E2-Y2" relay found in many 1970s-era Palomar amplifiers has a bad habit of going bad.
It got discontinued and expensive. American Zettler also made one called the "AZ531", but it got hard to find around 20 years ago.
This adapter board has pins under it that will fit the holes in the original circuit board. The chip socket on top accepts a variety of DIP-type relays. The Omron G5V-2 used in the pics is rated for 2 Amps, same as the original R50 part.
Next step is to try one of these in a couple of Palomar 300A amplifiers. A friend across town is picking one up to try in his amplifier. I have a 300A here that will get one of these before the owner picks it up and takes it home to Georgia.
I remain skeptical until I see it work. The square pins on the bottom that fit the original circuit boards are a tight fit in the adapter board's holes. Really tight. Ordered some thinner ones to try, so don't expect it to get marketed any time soon.
Just the same, thought I'd show it off. With luck (and money) it could become available eventually.
73
