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18th December 2012, 02:19 AM
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#1 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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Super Leach amp
Super Leach amp, this is a 20 year old amplifier and begging for a rebuild,
      as it look 20 years later:      soft start and protection circuit board....    central ground point.....  power traffo....  
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18th December 2012, 02:27 AM
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#2 |
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diyAudio Member
Join Date: Dec 2009
Location: Newnan GA
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do you have the schematic for it ?
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18th December 2012, 02:31 AM
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#3 |
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diyAudio Member
Join Date: Feb 2003
Location: ..
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20 yrs isn't much, vacuum up the dust, power, preferably thru a Variac to ramp V slowly for electrolytic reforming
but many would go ahead and just replace all electros looks like power wiring could be improved - at least some twisting Last edited by jcx; 18th December 2012 at 02:57 AM. |
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18th December 2012, 03:55 AM
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#6 | |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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Quote:
the main filter caps will be replaced with newer Nichicon 47Kufd/100volt rated for 105*C....all ecaps will be replaced also... the power traffo will be replaced so i can get +/-95volts dc rails at idle...
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18th December 2012, 09:09 AM
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#7 |
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diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
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Most of it looks 20 years old, except the output transistors. They are branded ON which means they are from 2000 at the oldest.
Other than that, a good clean and some new electrolytics, and im sure she'll be golden 
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18th December 2012, 09:50 AM
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#8 |
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diyAudio Member
Join Date: Jun 2009
Location: Hamburg / Germany
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18th December 2012, 10:46 AM
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#9 | |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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Quote:
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18th December 2012, 11:07 AM
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#10 |
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diyAudio Member
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I'd retighten the star ground, but you say you're going to rewire it anyway. Also change the diff amp emitter resistors and feedback resistors at the least with metal film, 25ppm .1% or better, and any other resistors you can afford. Maybe a cermet pot for bias; better quality.
Good job on the cooling fans; that'll let it crank out all the watts your ears can stand. |
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