Re: Thanks again - john curl - Tweakers' Asylum

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Re: Thanks again

Posted by john curl (M) on March 25, 2002 at 15:03:43

In Reply to: Thanks again posted by Thomas on March 24, 2002 at 23:40:52:

Thomas, you almost make me laugh with nostalgia! ;-)
In 1974, I moved to Switzerland and I needed a 60 Hz source to run my Ampex tape recorder. I built it with an Xtal source that Ampex had made for motor drives. When I got my Linn, I got the 60Hz version and used the same source. In those days, Linn was bigtime into using the powerline only. In 1977, when back in the USA, I ran the Linn straight off the AC line, and Ivor (the terrible) came to visit one day. We discussed Xtal control and Wien bridges, and he said it was NOT the right thing to do. The powerline, to him at the time, as almost perfect. I begged to differ. Now, it would seem that he has changed his mind, and that virtually any artificial source is OK, so long as it still drives an AC motor. I think that either Xtal or Wien bridged oscillator could be OK in this case, as good as the AC line.
If you live in Europe, and have 50 Hz AC, then try this test, if you get a scope. Lock the scope to the line and monitor the artificial source going to your motor. Note if you see any phase shifting of the AC line. This is of course best seen and believed when you have a precision Xtal source, because you can see it weaving back and forth, because the 50 or 60 Hz AC is locked to the sweep and IT is weaving back and forth. It is an eye opener!

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Follow Ups Full Thread

Topic - Help with turntable motor control board - Thomas 10:30:40 03/24/02 (15)

Re: Help with turntable motor control board - Dman 21:50:12 03/24/02 (3)

Follow up questions - Thomas 03:22:15 03/25/02 (1)

I fixed it! - Thomas 10:06:42 03/25/02 (0)

Thank you very much! - Thomas 23:25:58 03/24/02 (0)

Re: Help with turntable motor control board - AR guy 11:34:23 03/24/02 (10)

Thanks - Thomas 12:19:50 03/24/02 (9)

Re: Thanks - AR guy 13:51:02 03/24/02 (8)

How does the Valhalla and Lingo work? - Thomas 16:20:59 03/24/02 (7)

Re: How does the Valhalla and Lingo work? - AR guy 23:11:09 03/24/02 (6)

Thanks again - Thomas 23:40:52 03/24/02 (5)

Re: Thanks again - john curl 03/25/0215:03:43 03/25/02 (4)

Another funny thing - Thomas 02:41:03 03/26/02 (2)

Re: Another funny thing - john curl 15:45:52 03/26/02 (1)

Ahh... - Thomas 00:10:21 03/27/02 (0)

Re: Thanks again - Thomas 02:20:15 03/26/02 (0)

Follow Ups

Re: Thanks again - john curl 03/25/0215:03:43 03/25/02 (4)

Another funny thing - Thomas 02:41:03 03/26/02 (2)

Re: Another funny thing - john curl 15:45:52 03/26/02 (1)

Ahh... - Thomas 00:10:21 03/27/02 (0)

Re: Thanks again - Thomas 02:20:15 03/26/02 (0)

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