|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
64.122.72.31
In Reply to: RE: Atma-sphere M-50 history posted by baileyler on May 22, 2012 at 18:21:07
The serial number log does not indicate anything about the upgrades to the amp but for one this old that is not surprising.
BTW your power supply covers are on incorrectly- the slots should appear on top rather than to the rear.
Follow Ups:
Ralph can you tell us the probable tube life of these amplifiers if all is working correctly ? Thanks.
There are a lot of 'ifs', if the tubes are clean, biased right, warmed up right, run on a moderate load with moderate powers, if there is good air circulation, etc., then 10,000 is the expectation. We have seen this happen a lot over the last 20 years. Sometimes a tube is marginal from the factory and does not hold out all that long, other times the tubes go well in excess of that- we've seen over 20,000 hours too.
Strange on the covers - I have had two pair of M-50s and both came to me with the vents as seen in the photos.
At least that is something I can fix.
Anything I should look for in particular that might indicate an upgrade to M-60 Mk 1 status?
If its got the toriod you will see it when you correct the cover. There will also be a mounting bolt head visible on one of the power supply side panels.
They look to still be M-50s, as they have the Sub-Tronics transformers. I guess I need to have a talk with the guy that sold them to me.
It does, however, look like someone has been under the hood as some of the caps look to have been replaced at one point.
The other block has an additional dark blue cap (bottom right one).
That would at least explain why the covers were on the wrong way.
I would consider sending them in for a checkup and possible upgrade, except that I am not willing to ship (they are in too nice shape). As much as I try, there is no more "handle with care" by any of the shippers.
They actually work well now and are stable, so I will probably keep them going this way as long as I can.
Ralph - ever come to the Philly area?
Look great...thanks for the pic....i gess i misset them before
In the bottom photo, I see that the older method of mounting the meter is used. This can result in the meter becoming inaccurate if the mounting is over-tightened. The meter should appear to be a little loose in the front panel. If not, loosen the nuts on the backside to make it so. A drop of locktight or fingernail polish will keep them from moving.
It does look like a cap got replaced in the output section. Otherwise the condition looks great!
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: