nope. Issue is back. Time to bring it to a professional...
Anyone experienced speed issues with Artemis Labs SA-1?
Hi guys.
I was listening for several hours and then out of blue on the last record the speed started slowing down and back and then down again. I had zero issues in my 2 years or so of ownership. Used in an all Artemis lab system.
I used my cell phone to measure (after stopping and removing the record) and it showed around 32 rpm first which then - after a few revolutions_ dropped to 30.
Wondering if anyone had the same issue and figured out the fix.
Thaks
L
I was listening for several hours and then out of blue on the last record the speed started slowing down and back and then down again. I had zero issues in my 2 years or so of ownership. Used in an all Artemis lab system.
I used my cell phone to measure (after stopping and removing the record) and it showed around 32 rpm first which then - after a few revolutions_ dropped to 30.
Wondering if anyone had the same issue and figured out the fix.
Thaks
L
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- 21 posts total
Did you have any luck with resolving the speed issue? I remember reading that each ps was matched to the motor in the deck, a task that required the use of an oscilloscope if so a plug in replacement is unlikely. The ps was designed by John Atwood. http://www.one-electron.com/designExperience.html |
It seems the upper motor bush has run dry and worn, at least I can feel some play in it. I’ve been in the habit of leaving the deck running all day as the sound improves for the first hour after switch on, sometimes I forgot to turn it off before turning in for the night. This practice has been fine on previous decks with synchronous motors but the DC motor on the Artemis runs a lot faster. The glue holding the pulley had softened enough that I could ease it off to get a bit of light synthetic oil to run down the shaft. I used a bit of Loctite 648 retainer to stop the pulley slipping, not sure about my choice there but it’s what I had. The speed was still unstable with the Artemis ps at first but a lab power supply set to around 6.2V gave 33 1/3 rpm on a strobe disc, the current draw was initially near 0.1A but after running a few days this had dropped to 0.02A. With the main bearing nicely warmed up the deck would now run stably on the Artemis ps but the next morning starting afresh I was unstable again for an hour before I gave up. A few days later I started it up again and it settled after a few minutes. Ideally I’d like to replace the motor and do it myself but the Artemis ps needs matching to the individual motor and I’ve not discovered how to do this, there are two trim pots inside the case so potential to get it really wrong. The lab ps makes the deck sound really ordinary so that’s not an option for running it. I’m resisting the temptation to investigate further, for now. |
- 21 posts total