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super_7b 12th Jun 2011 2:50 pm

Farnell L30 PSU

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.



Stockden 12th Jun 2011 8:00 pm

Re: Farnell L30 PSU
1 Attachment(s)
Hello Mick,

This manual shows OC type transistors in the circuit. With luck it's the one you need.


super_7b 13th Jun 2011 6:20 pm

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.



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