"All of the bathtub shaped caps will be bad, or will go bad shortly. They're just paper capacitors in tar. And, as in all antique radios, some resistors will be out of tolerance and will need replacement. Plus, you'll have…"
The Fine Things are Always Hand Made
Daniel Kingloff's Discussions
Scott 800 PM vs electromagnetic speakers
Started this discussion. Last reply by Alex R. Whitaker Dec 30, 2024. 16 Replies 0 Likes
I have an 800 chassis that I bought some years ago without a speaker or cabinet. I'd like to get it working again but have some confusions about the speakers. I understand that some were PM and…Continue
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"No rush here. Planning is the key to most of these things I've done."
"light oil on motor drive - like sewing machine oil, not 3 in 1. Like with a phono, don't want the oil to gum up.
The usual filter caps and the caps including bathtub caps like the .05 and .01 MFD.
Be sure the relays work…"
"Coupling capacitors to the grids of the output tubes for sure as a preventive measure even if they still work. Also the 25-mfd cathode filter on the output tubes. Failure of these components may cause damage to transformers. Other…"
"Other than the electrolytic caps, are there any other usual suspects that will need replacement?"
"Yes, that would be a late model manufactured around January 1947 but likely stored on a shelf until needed to fulfill an order. There will be an inspection date ink stamped on the inside of the station finder commutator shroud (square box on…"
"OK all it took was moving some things around on my project table (it's like those finger puzzles we all had as kids with 25 spaces and 24 numbers except mine has more numbers, but I digress) and I looked at the back of the tuner and found…"
"Where would the serial number be located?"
"Find the male Jones 10 pin plug that fits the speaker socket. Then wire an appropriate speaker with or without a tweeter following the diagram - Riders diagram in Volume 15, pages 41 & 42, assuming your serial number is above number 2000,…"
"Wow guys, almost TMI!. It's a future project so I'll have to gather some information before attempting. Is there any information available about wiring to substitute a PM speaker for the EM one?"
"Riders volume 15 has extensive documentation and diagrams for the Scott 800-B."
"The Scott 800-B is a complicated post war radio made more so with the extensive wiring for the station preset buttons running the motorized dial. And also because relays operate the power switch and the AM/FM switching. But properly restored…"
"I'll do it! Thanks"
"Check the Scott Info Archive on this page.....it might have that information. Based on my experience with other brands, in that post-war era, it's probably 3.2 ohms to the speaker voice coil. Input would be typical 6L6 class B…"
"So what is the native output impedance of the output transformers?"
"There were two versions of the Model 800B, early and late. The late version had two chokes on the power amplifier and a revised tube layout. Many of the early version were updated to add the additional choke. The early version had…"
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