Old Penncrest stereo console, who made it and should i get it?
Hello All! Sat. at the local GW i spy a console stereo out of the corner of my eye. It is branded Penncrest, it is a tube model, with 11 tubes on one chassis, My curiosity is up so i go home and try to find out more info about it with Google. It is a model 662fm-a and the only pic of it is from a SAMS Photofact manual for sale on the -bay. evidently this is the only that has survived or it is a piece of junk no one thought worth the time to snap a pic and upload it to the web.
A few strange things i have noticed about it are, audio output uses 1 7686 pentode in singled ended operation per channel. It uses a straight line magic eye tube for tuning like European and McIntosh Tuners. thirdly this stereo uses a outboard demultiplexer for FM stereo "missing or never installed in this unit". Anyone have one of these or know who made it for JCP? Or if it is worth picking up? The price is $50 today and $25 next Sun. Thanks all, Logan |
I'd get it when it is $25. You can probably add any tube MPX adapter....Using that adapter dates it somewhere in the 1959-63 range, by my reckoning. Single ended can sound VERY good if the engineers bothered to make it good.
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http://www.datasheetarchive.com/dl/6...ecoder+mc1310p |
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It's possibly built by Symphonic or another east coast maker. It could be similar to the Bradford that used a single ELL80 dual output tube. |
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It was easier to adapt an NTE-743, which is a similar IC to the MC1310, a Motorola chip. As I fuzzily recall 30 years later, the range of the pilot tone generator on the NTE (an LM-something) could be tuned to 15.7 kHz. But the Motorola IC was designed to be stable at 19 kHz and varying it did not work well. |
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You will find in the Jan. & Feb. 1987 RADIO-ELECTRONICS a write-up on a tv stereo decoder with signal processing using an LM1800 & SA570 chips. Was a good design. All the best,Tom.J
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Dang it, now I've got 2 more scratch project builds i want to do...You guys are a bad influence. :D
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This is probably the multiplex that originally came in your (Wells-Gardner) Penncrest:
http://www.searchinforums.com/st/con...-tube-amp/4546 Maybe you can buy it from him. . |
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http://www.nj7p.org/Tubes/PDFs/Frank...ngham/7868.pdf OOPS i meant 7868 time to get new glasses! |
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Some of those private label products were amazing! :thmbsp: |
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Well i dun gone and did it. I am glad to be able to be the first person to post live pics of a Penncrest 662FM-a stereo console on the web.
I added some pics of the inside. |
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