Purely and simply I was in there, replacing capacitors trying to get rid of a hum and for the couple of seconds, it took to change them it made sense , had I not been doing other work on the amplifier? I probably wouldn't of changed them
@@andygozzo72 without having a circuit diagram for the amplifier, and having a soldering iron in my hand and the parts to hand, it was no hardship to change them
@@dark1stu hmm, would need to see the circuit to see what could cause it...i've had a look in my rtvs books and a search on the internet and so far cant find it .. just out of interest check grounding continuity to the metal casings of the control pots, especially the volume one , i had issues with that type pot in a Gould oscilloscope i had to solder grounding connections directly to the outer 'cans', they only get a connection normally via the lugs holding the cans to the mounting bushes, and that relies on spring pressure, and its dissimilar metal so can develop poor contact.....
@@andygozzo72 it's odd and the cartridge being faulty is the most likely contender. It's possible something on my bench was causing it , if it was magnetic cartridge, I would be looking at if the screen cable was disconnected, but it's not , I think it's gonna end up on eBay for parts , I've got that many projects, I've got to get through to try and make some space for new toys
why did you replace those 2 suflex/polystyrene capacitors? they rarely fail
Purely and simply I was in there, replacing capacitors trying to get rid of a hum and for the couple of seconds, it took to change them it made sense , had I not been doing other work on the amplifier? I probably wouldn't of changed them
@@dark1stu they wouldnt and couldnt cause hum
@@andygozzo72 without having a circuit diagram for the amplifier, and having a soldering iron in my hand and the parts to hand, it was no hardship to change them
badged RDG but made by ITT .Easy to fix and it will sound rather good when fettled up
That makes sense
If the cartridge is faulty it will hum
not necessarily, depends if hums at all setting of volume control or not
The hum continues when you turn the power off , it does increase and decrease with the volume setting
Potentially this is something that could cause it unfortunately I don't have a replacement to try .
@@dark1stu hmm, would need to see the circuit to see what could cause it...i've had a look in my rtvs books and a search on the internet and so far cant find it .. just out of interest check grounding continuity to the metal casings of the control pots, especially the volume one , i had issues with that type pot in a Gould oscilloscope i had to solder grounding connections directly to the outer 'cans', they only get a connection normally via the lugs holding the cans to the mounting bushes, and that relies on spring pressure, and its dissimilar metal so can develop poor contact.....
@@andygozzo72 it's odd and the cartridge being faulty is the most likely contender. It's possible something on my bench was causing it , if it was magnetic cartridge, I would be looking at if the screen cable was disconnected, but it's not , I think it's gonna end up on eBay for parts , I've got that many projects, I've got to get through to try and make some space for new toys