#16
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Between it and the bell of the CRT is the yoke, with wires running from it to the HV cage. Hope you get it and make it worka again. Good Luck, Cliff Last edited by cbenham; 09-28-2012 at 03:28 PM. Reason: correction |
#17
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Love the dueling 5U4s atop the PT.
__________________
Ham shack...AM side: Knight-Kit T-60, RME-45 Vintage SSB side: National 200 Modern SSB: Kenwood TS-180S MFJ tuner, 130' dipole |
#18
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Me, too. I've never had a TV with them in the PT, until I got my RCA roundie CTC-7.
I want to see more pictures of the OP's set! |
#19
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I have some Hoffman Mark V chassis sets with 1 5u4 mounted on the transformer, but not 2! I also have a 1937 Philco Radio with the rectifier mounted on the PT.
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#20
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What is that long thin copper colored thin coil going from the yoke to the socket of the CRT? Looks like a super long warped screw.
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Audiokarma |
#21
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Made of the same material as the old speedometer shafts. |
#22
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Also, the larger screen sets, where the B+ demands were higher. |
#23
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I know that two 5U4 tube rectifiers represent a four diode smoothing of the AC waveform. I wonder if the old sets more commonly used plain full wave, full wave bridge, or perhaps even doublers. Maybe a little of all of them. Just curious.
__________________
"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free" |
#24
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Interesting that it has an Electromagnetic Speaker instead of a PM, 53 seems awfully late for that.
I have a 53 but the speaker is located in the bottom so I don't think I've ever looked at it all that closely, don't know what it is. Those Cotton Straps holding the Yoke get very brittle, I broke one of mine when I changed the CRT just by bending it sideways, snapped off like it was made of Pasta. |
#25
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I just checked my 17 inch 1953 console... the 4 wires going to the speaker (10" or so) look exactly the same, but the speaker has a choke mounted to the frame. The UHF tuner is hardwired to the chassis on the console, while in the table model the power for the UHF is taken from an adapter plugged in to the audio output socket (with the tube plugged in on top of the adapter). Both sets are early production '53 models, and were purchased before Christmas 1952.
Thanks for the "heads up" on the weak straps! I will be careful If I ever have to mess with them. jr |
Audiokarma |
#26
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jr |
#27
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You'd have to look at the schematic to see how they're connected. Sometimes in parallel, or each one connected, half wave. They also used two rectifiers using two high voltage windings to obtain two different voltage sources.
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