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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 18th Apr 2021, 7:36 pm   #1
yestertech
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Default Lecson AC1 preamp - need a PCB layout

I'm currently working on one of these rather, how shall we put it, unconventional preamps !
I have some useful service information but I'm chasing down a fault with the FET switches of which there's quite a few !
Does anyone know where I might just find the PCB component layout details ?
Some lettering is visible on the board ( test points I think ) but most of it seems to have faded badly
THANKS

Andy
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Old 18th Apr 2021, 10:00 pm   #2
tony brady
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Default Re: Lecson AC1 preamp - need a PCB layout

I have the instruction manual and the circuit diagram but there is no pcb component layout.

if only on one input it looks like a case of tracing the signal from the input din sockets - didn't they have problems with the reed switches for input selection?
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Old 18th Apr 2021, 10:03 pm   #3
yestertech
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Default Re: Lecson AC1 preamp - need a PCB layout

Thanks Tony
That's probably the same info. I have, but alas no layout.
The reed switches are all operating but I need to check signal levels at specific take off/options points and the board is stuffed with transistors, dozens of which are FET switches.
It's a bit of a squash !

Andy
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Old 18th Apr 2021, 10:05 pm   #4
tony brady
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Default Re: Lecson AC1 preamp - need a PCB layout

I can imagine. happily I only had to fix a few of the power amps back in the day!
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Old 19th Apr 2021, 5:52 am   #5
Craig Sawyers
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Default Re: Lecson AC1 preamp - need a PCB layout

Lecson was the first company that Bob Stuart and Alan Boothroyd started up. They later started up, and ran, Meridian (originally called Boothroyd-Stuart Meridian).

There is a chance that, although both founders have retired, Meridian still have a service archive of Lecson.

And there is a company that specialises in fixing them up in York. They probably have service data http://www.lecson.com/

Good luck!

Craig
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