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Post by nuradio on Feb 8, 2023 20:38:38 GMT 12
Are those resistors (that broke) black in colour, with a white stripe at one end? The only things I see on the top of the capacitor are diodes. What do you mean by 'reinstalled the interface'? yeh sorry, the diodes broke. one was black with blue writing saying 40, think it was a blue stripe from memory. the other was mostly marron/red with no writing. im new to electrical stuff and just put in resistors, i now know the difference. interface as in the dials and knobs/main board.
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Post by Peter Walsham on Feb 8, 2023 21:07:12 GMT 12
Ah, OK. Resistors, capacitors & diodes are all very different components.
You will need to remove the two resistors that you fitted, and replace them with two diodes. Jaycar stock '1N4004' diodes (cat. no: ZR1004) which are ideal to use. Diodes have a white stripe that's very close to one end of the diode. You need to connect the striped end of each diode together and solder that joint to the +ve terminal of the new capacitor. The other (individual) ends of the diodes connect (separately) to the two wires coming out of the power transformer. If the original diodes broke easily, it is possible (and you may be lucky) that one (or both) of the original diodes may have been shorted, which certainly would cause hum and the power transformer to overheat..
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Post by nuradio on Feb 8, 2023 21:45:28 GMT 12
Ah, OK. Resistors, capacitors & diodes are all very different components. You will need to remove the two resistors that you fitted, and replace them with two diodes. Jaycar stock '1N4004' diodes (cat. no: ZR1004) which are ideal to use. Diodes have a white stripe that's very close to one end of the diode. You need to connect the striped end of each diode together and solder that joint to the +ve terminal of the new capacitor. The other (individual) ends of the diodes connect (separately) to the two wires coming out of the power transformer. If the original diodes broke easily, it is possible (and you may be lucky) that one (or both) of the original diodes may have been shorted, which certainly would cause hum and the power transformer to overheat.. yeh cheers, i can tell you the hum for sure has gone. Since the maroon/red diode just broke with little touch that may have been one of other issues. Even with the resistors on, the speakers and interface bulbs lit up and the turntable spun and worked but also seemed seized, nothing worked before the capacitor swap. il get some 1N4004 from jaycar, and the previous diode i just checked was a 1N4002(i think) or 1N4020. cheers mate, will get that rolling and post an update if anyone is interested still. but also have to resolder some stuff since they broke off. also the chassis(not sure the technical name) that the wire are grounded to, one of the solders snapped off it and my solder wont stick it back onto the chassis, any recommendations on what to do there?
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Steve
Society Members
vintageradio.co.nz
Posts: 732
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Post by Steve on Feb 9, 2023 6:02:54 GMT 12
As Peter said - those are not resistors if you mean the two components coming from the tag-strip to the large capacitor - they are diodes. If you have broken them you'll need to replace them with something like 1N4001 or 1N4004 or 1N4007 - or some equivalent silicon rectifier diode.
The part of the circuit diagram relevant to this part of the stereogram is in the bottom right corner. T6 is the power transformer (yellow), C40 is the small yellow disc ceramic cap (0.01uF) under the diodes, D4 and D5 are the two diodes it sounds like you broke, and C39 is the big capacitor with the metal clamp that you replaced. You won't be able to get BY36 diodes any more - the modern equivalents I have listed above - Jaycar will have them.
Cheers, Steve
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