good morning friends,
long ago i visited one of hifi guy , he is running a exotic set up with krell amp, all the items in the set up is very impressive. i was speech less when i heard his set up for a moment.i started to observe the components in the system. the amp is krell ksa 200s,speakers were jbl l4333/L300,,, player is pioneer reference player.
then come to pre---i saw a yamaha c2quitely sitting on one side. the first look it is solid metal chunk.
i asked him about the pre, he told he tried krell krs2/3 and some of the finest names in the business but none was likes his intrest.
it really amazing, its a no nonsence pre with full with very high quality components.
i saw one ad in ebay, the seller describes it is not working.
i paid usd250including shipping to my place.
its around 10kg.
after receiving the power is not switching on .
i opened the amp and primary diagnostics inform that power is not extending from the switch.
the micro switch is the culprit,its a alps switch , the reason is that the contacts get oxidized and they are not contacting properly.
i disconned the micro swith , its a sealed one, hence drilled the revits and opened. found contacts are bad, cleaned with crc but no use, finally took very fine ememry paper and done little sanding.
switch on the amp:clapping:
now the amp is in power,happyness was not last long, found a slight hum on both the speakers increasing with volume.
googled net and found that aged caps are one of the reason, before doing some other tests i decided to go for recap.
the total electrolytic caps in the pre is 33 .
selected caps are "NICHICON MUSE FINE GOLD SERIES" and bypolar caps are nichicon muse caps.
ordered the caps from Korea(original re seller-no fakes),received caps from EMS in 5 days(cost of shipping with all caps is $60)
started recapping,
first i made drawing and took plenty of images which shows the direction/polarity of the caps.
the bipolar caps doesn't have direction, you can place them in any direction.
desoldering done by heating the joint then use the desoldering pump to remove most of the lead from the joint.its a must otherwise you damage the traces.
cleaned with plenty of wipes.
done one at a time.
first power section then switch on, then tone control board...etc l,its easy to trace if some thing goes wrong.
the result....
listening one the best preamp in my life, dead quite,amazing dynamics,very very musical.
very very good.
Yamaha C-2 on thevintageknob.org
long ago i visited one of hifi guy , he is running a exotic set up with krell amp, all the items in the set up is very impressive. i was speech less when i heard his set up for a moment.i started to observe the components in the system. the amp is krell ksa 200s,speakers were jbl l4333/L300,,, player is pioneer reference player.
then come to pre---i saw a yamaha c2quitely sitting on one side. the first look it is solid metal chunk.
i asked him about the pre, he told he tried krell krs2/3 and some of the finest names in the business but none was likes his intrest.
it really amazing, its a no nonsence pre with full with very high quality components.
i saw one ad in ebay, the seller describes it is not working.
i paid usd250including shipping to my place.
its around 10kg.
after receiving the power is not switching on .
i opened the amp and primary diagnostics inform that power is not extending from the switch.
the micro switch is the culprit,its a alps switch , the reason is that the contacts get oxidized and they are not contacting properly.
i disconned the micro swith , its a sealed one, hence drilled the revits and opened. found contacts are bad, cleaned with crc but no use, finally took very fine ememry paper and done little sanding.
switch on the amp:clapping:
now the amp is in power,happyness was not last long, found a slight hum on both the speakers increasing with volume.
googled net and found that aged caps are one of the reason, before doing some other tests i decided to go for recap.
the total electrolytic caps in the pre is 33 .
selected caps are "NICHICON MUSE FINE GOLD SERIES" and bypolar caps are nichicon muse caps.
ordered the caps from Korea(original re seller-no fakes),received caps from EMS in 5 days(cost of shipping with all caps is $60)
started recapping,
first i made drawing and took plenty of images which shows the direction/polarity of the caps.
the bipolar caps doesn't have direction, you can place them in any direction.
desoldering done by heating the joint then use the desoldering pump to remove most of the lead from the joint.its a must otherwise you damage the traces.
cleaned with plenty of wipes.
done one at a time.
first power section then switch on, then tone control board...etc l,its easy to trace if some thing goes wrong.
the result....
listening one the best preamp in my life, dead quite,amazing dynamics,very very musical.
very very good.
Yamaha C-2 on thevintageknob.org
