13th Jan 2014, 8:20 pm | #141 |
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Re: Pye Black Box
OK. In post #65 you were advised to connect the wires going to the amp PU sockets to pins 5 and 6 at the bottom. No mention of the other tags.
https://www.vintage-radio.net/forum/...4&postcount=65 I still don't understand where the second red wire disappeared to and where the green wire came from. No matter though. How many wires/screens were originally routed through the tone arm? Is the cartridge mono or stereo?
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14th Jan 2014, 10:47 am | #142 |
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Re: Pye Black Box
As stated clearly in post 66 the red wire was damaged and replaced. The cartridge is mono.
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14th Jan 2014, 10:57 am | #143 |
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Re: Pye Black Box
Were the original wires screened? In post #62 there appear to be a couple of sleeved connections to tag 1.
https://www.vintage-radio.net/forum/...3&postcount=62
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14th Jan 2014, 11:21 am | #144 |
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Re: Pye Black Box
Yes
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14th Jan 2014, 11:41 am | #145 |
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Re: Pye Black Box
I would suggest renewing the wiring between the cartridge and the under chassis tag strip, using screened wire or cable as per original and making a neat job of it.
It may not cure you problem, but at least it will eliminate something from your investigations. Back in post #127 you said that the amp would not work when fed from an MP3 player. "Dead" was the word used. In post #133 you said that the deadness was down to a tag coming off one of the tag strips. Does the amp work from an MP3 player now?
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14th Jan 2014, 2:08 pm | #146 |
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Re: Pye Black Box
I'm not sure if the cartridge should be connected to the turntable chassis? Here's how I'd connect up the tonearm wires.
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14th Jan 2014, 8:13 pm | #147 |
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Re: Pye Black Box
Thanks Radio, that's more what I was expecting when I asked if I had the wires in the right place.
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15th Jan 2014, 12:18 pm | #148 |
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Re: Pye Black Box
Got a lot of volume now but when you turn it up about half way it becomes distorted. Tried with a good cartridge and the same happens.
Kevin |
17th Jan 2014, 1:13 pm | #149 |
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Re: Pye Black Box
Glad that it seems to be fixed, or at least headed in the right direction.
Hard to say whether the distortion is abnormal or not. I would say that mine doesn't get much louder past 50% volume, and it definitely distorts when turned up all the way, unless using a really quiet source (e.g. a line level input). Are you testing with 45s or LPs? 45s are a lot louder on mine, hence more distortion prone. |
17th Jan 2014, 3:55 pm | #150 |
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Re: Pye Black Box
And, Kevin, are the speakers definitely OK? Try feeding them from something else to make sure. Sometimes the central suspension can come unstuck and cause a lot of distortion at higher volume levels.
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17th Jan 2014, 6:28 pm | #151 |
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Re: Pye Black Box
Don't know how to feed the speakers from something else due to them being attached to amp via three pronged plug.
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17th Jan 2014, 8:05 pm | #152 |
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Re: Pye Black Box
Simple, Kevin. Just unplug them, then connect the output of another record player (or similar) to the relevant two pins of the plug, or to one of the two speakers' two terminals (either will do as I think they're wired in parallel).
Just make sure what you're driving them can cope with a low impedance speaker (probably 1.5 Ohms in this case) - another valve record player would be ideal, but do watch out if it's a live chassis design!! N. |
18th Jan 2014, 2:01 pm | #153 |
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Re: Pye Black Box
I found that the prongs on mine fitted nicely into a piece of terminal block, to which I'd attached some speaker wire. An old Technics mini system served fine for testing purposes, but did have to set the volume pretty high thanks to the low impedance and made the amp rather warm so didn't run it for long.
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18th Jan 2014, 2:34 pm | #154 |
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Re: Pye Black Box
It might be an idea to separate the speakers, and test each one individually, in case one is faulty.
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18th Jan 2014, 4:01 pm | #155 |
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Re: Pye Black Box
Right, managed to get my ipod to play through an amp which was then attached via the speaker terminals to the speakers in the black box and hey presto there was sound. The speakers sounded fine, plenty of volume and only a little distortion when played loud so they seem to be ok. The only "original" components left are 4 resistors which seem to measure ok. Think I will change them out anyway. If nothing else it will at least eliminate them.
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18th Jan 2014, 7:42 pm | #156 |
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Re: Pye Black Box
Keep at it Kevin, I admire your perseverance.
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18th Jan 2014, 9:17 pm | #157 |
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Re: Pye Black Box
Perseverance? Sheer ****** mindedness more like
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19th Jan 2014, 3:38 pm | #158 |
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Re: Pye Black Box
That's it!! I give up!! . Tried the thing again this morning and no sound!. Voltage has dropped to 110v at primaries on mains transformer! Getting 43vdc at the rectifier. Tried a new rectifier and the same. Time to put it in the bin and try a different machine. Thanks to all for your help, hopefully I have learned a lot from this experience.
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19th Jan 2014, 4:54 pm | #159 |
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Re: Pye Black Box
Well unless your mains voltage has dropped to 110V, which I very much doubt, the problem can only be the mains lead connections, player voltage selector or player OFF/ON switch.
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19th Jan 2014, 5:42 pm | #160 |
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Re: Pye Black Box
Don't bin it.....
Someone here'll want it, even if only to find out what exactly is faulty!
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