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| Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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Thread Tools |
12th Jun 2011, 3:50 pm
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#1 |
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Retired Dormant Member
Join Date: Dec 2010
Location: Wakefield, West Yorkshire, UK.
Posts: 2
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Farnell L30 PSU
Hi,
I have one of these PSUs and it isn't performing quite right. Having had a look inside, I'm not surprised, as the caps and resistors look original and it appears to be late 1960's or very early 1970's (all the transistors are OCxx series). I am going to replace the electrolytics and any off-value resistors, but I would like to know how to set it up properly. Has anybody got a circuit diagram, or better yet, a full manual for one of these? The one I found on this site relates to a "newer" (relatively) model with 2N transistors. BR Mick |
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12th Jun 2011, 9:00 pm
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#2 |
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Heptode
Join Date: Mar 2008
Location: Forest of Dean, Gloucestershire, UK.
Posts: 648
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Re: Farnell L30 PSU
Hello Mick,
This manual shows OC type transistors in the circuit. With luck it's the one you need. Hugh |
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13th Jun 2011, 7:20 pm
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#3 |
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Retired Dormant Member
Join Date: Dec 2010
Location: Wakefield, West Yorkshire, UK.
Posts: 2
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Re: Farnell L30 PSU
Thanks a load Hugh,
What a star! Exactly the model I have, an L30. Having opened it up for a fuller inspection, it has been "repaired" by someone with what looks a hot poker at some time and a transistor had been replaced. In doing so, a couple of mounting lands have lifted and one had parted company with the track on the board. I think this is why it wasn't working correctly. I will replace all the electrolytics while it is apart as they are dated Nov 1963 to Mar 1964. I am impressed they have held up for so long. BR Mick |
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