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#1
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Motorola TS-4J
Can someone confirm what should attach to the selenium rectifiers? Someone replaced mine but there are a lot of loose connections and I'm not sure what goes where. The schematics don't match the spare chassis I have (TS-4J as well).
Thanks, Zach
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"If it isn't broke, you aren't trying hard enough" |
#2
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I've restored several of these and the published schematics are correct. What differences are you seeing in your spare chassis ?
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#3
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Quote:
20180711_175753.jpg 20180711_181009.jpg This is the actual wiring of the spare. I realize this isn't in proper schematic form, but I didn't wanna confuse myself.
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"If it isn't broke, you aren't trying hard enough" |
#4
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Right the positives do not touch - the rectifier goes in between. Your spare isn't wired right. Maybe someone was trying to fix it ?
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#5
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We can only guess. The spare had numerous evident repairs. It blew both the diodes when I installed it in the main chassis, but hopefully all of the caps are still within tolerance.
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"If it isn't broke, you aren't trying hard enough" |
Audiokarma |
#6
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If the caps you mention you hope are still good, then if they are original they won't be.
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#7
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Even if those caps are new if the wiring errors put reverse polarity or AC across any of those caps the ones that got it are done for.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#8
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And if you don't take that into consideration, you may have headaches in the future. I realise it is difficult to throw away a "new" capacitor. But they are really not that expensive and there is security in knowing that they are new, and not stressed.
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#9
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If C79 shorted the 200 ohm part of the ballast resistor should of burned up very quickly.
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#10
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Quote:
What should the voltage coming off of pin 4 and pin 3 be?
__________________
"If it isn't broke, you aren't trying hard enough" |
Audiokarma |
#11
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I don't find a c79 power supply cap on the ts4j schematic.
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#12
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I think he meant C97.
I just spent a half hour trying to find the B+ source. It seems it's sourced from the cathode of the 12SN7, 2nd clipper. Slightly harder schematic to understand! Even the Sams isn't much better. |
#13
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The TS-4 family created the B+ rail by using several stages between B++ and B- as a voltage divider. You know how some makes used the audio output as a voltage dropper instead of a resistor...Moto took it a step farther by using several tubes in series-parallel to make a voltage divider. Crazy but it worked.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#14
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I was referring to C79 on the SAMs schematic(TS-4J Late). It's a little rf bypass connected to pin 3 on the ballast though it's located right behind the tuner.
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"If it isn't broke, you aren't trying hard enough" |
#15
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Quote:
That set's a little trickier to troubleshoot because it uses a floating B- line instead of a hot chassis. |
Audiokarma |
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