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Post by ampsmad on Jun 19, 2015 14:44:55 GMT
Long time lurker, first time poster in need of some assistance.
I recently picked up an X10 V3 from a car boot, unfortunately its been messed with......a lot and doesn't work correctly. I want to give it a new lease of life.
Could anyone please confirm what the original transistors (TR101 thru to TR106) are supposed to be. I don't think the ones fitted at present are original and I can't find a schematic anywhere with component values on. I also have reservations about the values of R108, R119 and R117, R101, if anyone could shed some light I would be most grateful.
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Post by PinkFloyd on Jun 19, 2015 19:10:09 GMT
Long time lurker, first time poster in need of some assistance. I recently picked up an X10 V3 from a car boot, unfortunately its been messed with......a lot and doesn't work correctly. I want to give it a new lease of life. Could anyone please confirm what the original transistors (TR101 thru to TR106) are supposed to be. I don't think the ones fitted at present are original and I can't find a schematic anywhere with component values on. I also have reservations about the values of R108, R119 and R117, R101, if anyone could shed some light I would be most grateful. Hi, Welcome to the forum. I don't have one with me at the moment but there's one coming in to be modded in the next couple of weeks so I'll be able to tell you what the exact values of resistors are then..... the transistors should be JE340 / JE350. If you can upload a photo I'll be able to tell you if it's right or wrong. All the best, Mike. |
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Post by ampsmad on Jun 19, 2015 19:50:24 GMT
Thanks for the welcome  I'll upload a picture later.....as I've left it in my office. The output transistors are correct then, I've replaced the PSU ones with 340/350's as I take it there the same as what's in the x-can V3. The valves test to spec on the AVO VCM and are pretty well matched, that just leaves the other transistors as they have been changed too. From looking at photos on the web they look like they should be ZTX757's maybe, are all the small PNP's the same type ? |
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Post by PinkFloyd on Jun 19, 2015 20:25:14 GMT
Photos first  Mike. |
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Post by ampsmad on Jun 22, 2015 9:39:25 GMT
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Post by Deleted on Jun 22, 2015 9:51:31 GMT
A small thing, but if you are not changing the 4 x 2W resistors, try bending the leads of the outer ones slightly to allow a little gap between pairs for improved air flow around them.
Alex
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Post by ampsmad on Jun 22, 2015 10:18:29 GMT
Thanks for the tip.
When I have it working correctly (without DC offset) I may pursue further upgrades too.
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Post by PinkFloyd on Jun 22, 2015 10:35:42 GMT
The capacitors are Panasonic FC and FM so not bad at all. For the output caps you're wanting 470uF / 16V non polar types, the rest of the board looks pretty much good to go.
Mike.
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Post by PinkFloyd on Jun 22, 2015 10:44:44 GMT
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Post by ampsmad on Jun 22, 2015 14:17:25 GMT
The capacitors are Panasonic FC and FM so not bad at all. For the output caps you're wanting 470uF / 16V non polar types, the rest of the board looks pretty much good to go. Mike. Although it looks pretty much good to go it has -39VDC on both channels at present. Do you know if all the other small transistors ZTX757's from manufacture ? |
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Post by ampsmad on Jul 1, 2015 8:29:33 GMT
Finally got around to sorting this X10 out and its now working correctly. The previous owner obviously didn't have a clue and had fitted a load of incorrect components. Anyway I couldn't find a schematic for this model anywhere so I've drawn one. Since Musical Fidelity were not helpful with info and are very protective of their old products I'll post a copy in the public domain for anyone who requires it in the future.  |
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Post by Deleted on Jul 1, 2015 9:57:47 GMT
It could be interesting to try the 2SA1930 (PNP) and 2SC5171 (NPN) instead of the MJE340 and MJE350, which don't even give their Ft in the data sheets from ON or Fairchild.
They would need to be rotated in the opposite direction though.
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I'll upload a picture later.....as I've left it in my office. 
