#1
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Advice / Schems on a General Electricrp 1561a
Sorry the title got messed up. Its a rp 1561a model.
So I bought this for a couple bucks at a church rummage. When you plug it in, all it does is buzz/hum at a constant rate, and moving the volume adjustment does not change the volume of said buzzing. Anyone know where to start? Need a schem too. Looks like the guy in the pic. |
#2
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The first thing to do is change the capacitors in the power supply. That's what's causing the buzzing. After you get those changed, see how it works. If you have any experience working on radios and such, you might not need a schematic.
__________________
" I'm gonna fix that one of these days" |
#3
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You need to replace the electrolytic filter capacitors most likely. Then you can discover what else it needs.
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#4
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Is this the guy to replace? Is this a bundle of capacitors? Never worked on anything this old, but I've recapped a couple CRT arcade monitors, and replaced caps on LCD screens.
Not sure what's up with this guy here. |
#5
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When I first saw the thing, I thought it was solid state. Then I looked again and it has the V-M changer. Looks like that vacuum cleaner tone arm.
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Audiokarma |
#6
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Yep, that's the filter capacitor. It's a three section. so you will need to get three seperate caps and tie the ground wires together. Looks like you might be able to make a bundle out of them, wrap in black tape and reuse the mounting bracket if you don't know how to restuff caps. Should be an easy fix.
__________________
" I'm gonna fix that one of these days" |
#7
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Pull the chassis and make sure the coupling capacitors aren't paper.. If they are change them too. That changer will need a bit of work, degrease, lube, and maybe a new idler. This record player will be nice foor old rock 45s
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#8
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Schematic is available in Beitmans 1963 manual.
Available at makearadio.com. Follow the prompts. |
#9
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Sweet. Thanks.
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#10
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Hopefully I can work on her the next couple days.
Here she is the day of her acquisition last summer. |
Audiokarma |
#11
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That filter capacitor was paper. Strange.
Anyway, of course Radio Shack didn't have the capacitors I required. A MFD is the same rating as a uf, correct? I'm having alot of trouble finding these. Do I just need a non-electrolytic? Last edited by samelliot; 01-29-2013 at 04:49 AM. |
#12
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Quote:
Also, a good place to get high value, high capacitance caps are from a scrap computer power supply or a scrap solid state color TV board. Paper cased multi section electrolytics were cheaper and easier to install on the production line. |
#13
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Quote:
OK, I was under the impression no paper caps were electrolytic. |
#14
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UPDATE:
So I replaced the caps, except a .47uf I forgot to order.... It seems to mostly work now. I think the pots are pretty dirty. Also it seems to have issues on both channels. Sometimes one will be ok, then the other will be humming, quiet or distorted. It's got one of those dual-needles for 78s and LPs. Anyone know how to tell if they are bad or where to get them? Here's a youtube vid http://www.youtube.com/watch?v=SFQ7N4kdxSw Last edited by samelliot; 02-08-2013 at 06:27 AM. |
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