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Old 8th July 2005, 08:28 PM   #31
docjoe is offline docjoe  Europe
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hi steenoe and jacco
now i've completed a first 12 hours run.
the temp is about 40 ° C. and bias set 0.75 amp on both channel; offset is 10 mv on one chanel and 60mv on the other...
have to trim those 47R and 33R resistors in the diff pair, as I changed these to BC550c.

yes you have to cross the speaker wires, unless you display the back of the amp in your setup.
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Old 8th July 2005, 08:38 PM   #32
steenoe is offline steenoe  Denmark
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Thats a pretty sight, doc I really do not get this right/left thing on the rear panel Hmmm, I guess my old friend has to wait a bit, before his amp is getting fixed! I simply do not have the time at this point, to make a larger restoring Doc, do you have a specific opinion about what is causing the oscilation?? Maybe the Tantal's as you mentioned, or the trimpots?? If I had something specific, I might give it a shot Thanks in advance

Steen

BTW I measured 40 deg C on the healthy channel and 50 deg C on the other.
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Old 8th July 2005, 09:31 PM   #33
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Quote:
Originally posted by docjoe

yes you have to cross the speaker wires, unless you display the back of the amp in your setup.

Hey guys, your not serious, are you???

To read them correct you must end those comments with a
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Old 8th July 2005, 09:45 PM   #34
steenoe is offline steenoe  Denmark
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Quote:
Hey guys, your not serious, are you???
As a matter of fact, this is actually correct At first I did take several readings on the rear panel, and had to conclude the facts: they actually swapped right/left on the silkscreening
Well, the guy doing this could be somehow excused, I guess Looking at the rearpanel from aft, would imply that the right channel is at the left and "vica verca"

Steen
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Old 9th July 2005, 07:35 AM   #35
docjoe is offline docjoe  Europe
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yes that' correct, but I presume that for maintenance point of vue, if you work on it, the PCB, are on the back as are the bias pots, its seems easier to .
anyway even if they crossed sides, the diode bargrap display is ok!
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Old 10th July 2005, 07:30 PM   #36
steenoe is offline steenoe  Denmark
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Just to let you guy's know, I decided to deliver the amplifier back to the (unhappy ) owner at this point It was quite a hard decision, but I simple do not have the time for a major workover at this point. Besides, it is way too hot in Denmark, to do big soldering jobs right now Thanks a lot for your inputs, anyway I will keep you posted if (probably when!)
I take it it on again

Steen
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Old 10th July 2005, 08:04 PM   #37
docjoe is offline docjoe  Europe
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What, you guys in Denmark dont have air conditioning?
well in Paris it is about 20°c now

Well I think I've finished my rebuilt, I hope it will last another 25 years...
I'll be pleased to hear about you...
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Old 10th July 2005, 08:14 PM   #38
steenoe is offline steenoe  Denmark
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Quote:
well in Paris it is about 20°c now
I am sure we have like 30C now, I feel for a swim right now! Lucky enough
to have Denmarks nicest beach, 500 meters away Well, the guy actually took the hole thing in a cool way. He would look for a ML! He has a pair of big Apogee clones, and they really demand some power. Those darn speakers, which are very well build indeed, are the size of a door But the impedance is hopeless
Otherwise, I would have made an Aleph for him, of course
The chassis with heatsinks could house an Aleph 5

Steen
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Old 11th July 2005, 12:20 AM   #39
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When he gets those ML buy his Stasis
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Old 11th July 2005, 03:24 AM   #40
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Assuming that he still wants to sell it.
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