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Old 1st April 2013, 06:55 PM   #1
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Default Leak stereo 20

Hi, does anyone know where I can source an accurate/original, circuit diagram and correct component values for this amplifier?
Thanks
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Old 1st April 2013, 10:14 PM   #2
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You can find some useful stuff here; Reference Documents
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Old 1st April 2013, 10:57 PM   #3
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Hi, thanks fit the info,
Tom
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Old 2nd April 2013, 02:54 AM   #4
zelgall is offline zelgall  Canada
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If you get the other side of that schematic sheet, it has the physical layout as well. It's available on line but if you can't find it I'll scan it for you. I have an original that came with mine.
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Old 2nd April 2013, 07:57 AM   #5
EssB is offline EssB  United Kingdom
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The stereo 20 circuit changed a little over time, the early version could be prone to overheating. The two main versions can be found here:
Leak Circuits
You need to identify which output transformer you have in your unit and then use the approriate schematic.
There's lots of Leak stuff on that site, it's worth a browse. H.J.Leak and Co. Ltd.
The hardcore leakies can be found at hjleak : "H. J. Leak & Co. Ltd."
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Old 2nd April 2013, 08:22 AM   #6
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Morgan Jones describes the Leak 20 as "noisy"....by modern standards. Perhaps one could chase down & correct such shortcomings via subtle modifications. He (Morgan) also notes the 20 also has " a few corners cut", perhaps this could be rectified as well. The Leak enthusiasts quite probably are aware of such shortcomings. Besides replacing most all caps for age issues, I for one would have custom OPTs made...........as I consider these paramount to performance.

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Old 2nd April 2013, 03:24 PM   #7
zelgall is offline zelgall  Canada
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The Leak outputs are the best part of the amp. That's one area they didn't skimp on.
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Old 3rd April 2013, 08:16 AM   #8
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any suggestions where one can source a replacement 3watt 100ohm wirewound resistor for this amp? This is the crucial one that drops out if it gets too hot and protects the mains tranny. Lots of different versions available in the uk, any suggestions as to type to go for and supplier?
thanks
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Old 3rd April 2013, 08:43 AM   #9
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If you mean R21, it is a standard wire wound resistor. CPC, Farnell, RS Components, Maplin Electronics, Greenhams almost anywhere will stock them.
W21 100R JI - WELWYN - RESISTOR, WW 3W 5% 100R | CPC
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Old 3rd April 2013, 08:58 AM   #10
45 is offline 45  Italy
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Quote:
Originally Posted by zelgall View Post
The Leak outputs are the best part of the amp. That's one area they didn't skimp on.
I agree. OPT's are certainly the best part of most medium-to-high level British vintage amps. Generally, they only need some improvements in the power supply.
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