Quote:
Originally Posted by radiotvnut
I know this is OT; but, I'll share my two cents on phonographs since you brought it up.
I've seen plenty of those record players from the '50's and '60's. Most of the mono units used a 25L6 tube in series with a 90 volt phono motor. The rectifier was usually selenium. Some of the later ones had a silicon rectifier. I've seen some stereo models that used two 60FX5 tubes in series. The main thing I dislike about these one tube record player's is that they require a high output cartridge (2 to 3 volts) to drive the tube. The better models used a lower output cartridge and had a preamp tube ahead of the output. The only portable record players I've seen with fuse protection were the classroom models (Califone, Newcomb, Audiotronics) and the "talking book" record players for the blind furnished by the library of congress. Some of those had a circuit breaker instead of a fuse.
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Some of those old portable phonographs were notoriously dangerous. What's worse is that they were more commonly used in the kiddie playroom or bedroom than as a livingroom entertainment. Left unsupervised by adults they became a serious fire and shock hazard.
Most of the Califones and Newcombs I encountered had a transformer power supply, but they may have made them both ways.