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Old 11th March 2010, 08:05 AM   #1
Gudmund is offline Gudmund  Iceland
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Default Leak stereo 20 modification

Have just bought a Leak Stereo 20 and a Varislope stereo preamp on Ebay just like the guy here where I found some pictures:
leakstereo20

I am new in valve business. Which components need to be changed? All - or only capasitors? Any info would be appreciated.

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Gudmund
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Old 11th March 2010, 09:31 AM   #2
SY is offline SY  United States
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Depends on your goal.

Restoration? Change out the power supply caps and any other electrolytics. You don't need fancy "audiophile" components, just well-rated 105 degree C electrolytics and decent film-and-foil polypropylene caps.

Performance? Gut and rebuild. Morgan Jones shows a lovely example in his book "Valve Amplifiers." His Bevois Valley circuit drops into that chassis with some minimal metalwork.
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Old 11th March 2010, 02:18 PM   #3
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by SY View Post
Depends on your goal.

Restoration? Change out the power supply caps and any other electrolytics. You don't need fancy "audiophile" components, just well-rated 105 degree C electrolytics and decent film-and-foil polypropylene caps.

Performance? Gut and rebuild. Morgan Jones shows a lovely example in his book "Valve Amplifiers." His Bevois Valley circuit drops into that chassis with some minimal metalwork.
Restoration is the way for me. I would like to hear the amplifier as it was. I will stay with the standard components as you suggested.

Have looked for Morgan Jones. There are more than one edition. - Will have to learn more before I try to change the circuit.

Have looked for replacement tubes - EL84 /ECC83. Value for money - which type shall I buy? Russian?

Thanks
Gudmund
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Old 11th March 2010, 02:37 PM   #4
adamus is offline adamus  United Kingdom
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6p14p - ev... lovely
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Old 11th March 2010, 03:17 PM   #5
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by adamus View Post
6p14p - ev... lovely
Better than old unused Siemens?
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Old 11th March 2010, 03:19 PM   #6
adamus is offline adamus  United Kingdom
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I have never compared them, but the 6p14p-ev are so affordable just buy them and try them. if not to your taste, stick them on ebay
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Old 11th March 2010, 03:23 PM   #7
Gudmund is offline Gudmund  Iceland
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Quote:
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I have never compared them, but the 6p14p-ev are so affordable just buy them and try them. if not to your taste, stick them on ebay
Ok - I do that. - Do you recommend a supplier in UK or EU?
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Old 11th March 2010, 03:54 PM   #8
adamus is offline adamus  United Kingdom
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ebay is your best bet
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Old 11th March 2010, 05:40 PM   #9
Gudmund is offline Gudmund  Iceland
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ebay is your best bet
I will search at Ebay.

Thanks
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Old 11th March 2010, 07:48 PM   #10
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I had a Leak Stereo 20 as my first valve amp. Lovely sweet hang in the air sound. Definately coloured, but in a very nice way.
Replace all the caps with some reasonable MKP or better types - they can go leaky and if they do they might take down the output trannys which would be very difficult to replace. There is a big ballast resistor in the early stage power supply - do not replace it as it acts as a drop out fuse. Most of the resistors will probably have drifted quite a bit in value. This is probably OK but its small money to replaced them all with good stable carbon comp.

Dump the Varislope preamp as it is rubbish and only worth gutting. The valves inside can be sold on as spares. The Leak has massive gain an d matches well with a passive preamp- anything with gain will be to much. One modification worth considering is replacing the input stage on the Stereo 20.

Shoog
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