Join Date: Jul 2002
Location: Jensen Beach, Florida
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The receiver should not have worked with the 70v speakers, that is where you have most of us stumped. I think that connecting those 70v speakers to the amp would pop the final amplifier.
I'm not sure how the Technics lasted so long, but nobody reading this thread is wondering why it stopped working.
The 70v amplifier is easy to get, and usually not to costly. Try Parts-express or Monoprice for a new 70v power amp. Also, the 70v amp would normally require a signal from a receiver, CD player, or external tuner. I don't shop for 70 v amps often, so you might find one with a tuner in it, I really don't know.
The receivers may have protective circuits in them, so they may not be damaged. If you have a couple of 8 ohm speakers, test them on the receivers to see if they still work.In my best guesstimation, the 70v transformers would represent a short to the receiver, and it should have never worked, and done permanent damage to the receivers. The only thing that could have protected your amps was the volume controls. The volume controls could never make the speakers match the amp final stage, but they could have protected them from an impedance mismatch. It depends on what kind of volume controls they are.