The Mellotron Group

Damn! I'm feeling worse about this all the time.  I've just rechecked my 
voltage across the big cap on the SMS4 - it reads 22 volts rock solid 
with my analog multimeter and with my digital jumps up and down between 
22.0 and 22.3 volts.  I'm using a fluorescent trouble light, plugged 
into the same 60 Hz circuit that the tron is running on, and the only 
strobe dots I can freeze (and they do hold fairly steady) is the inner 
ring - at two different positions on the SMS4's center speed pot (vr3). 
Of the two "freeze" positions, one is way too slow and the other is way 
too fast.
 I cannot, no matter what I do, get the outer ring of strobe dots to 
freeze.  I can get the tron in tune by ear, but neither ring of dots is 
anywhere near a freeze speed at that point.  I think I'm going to pull 
it out of the cabinet, check the tach head and then belt tension and 
start all over again.  Don't know what else to do.
johnb
1407




Bruce Daily wrote:
>
> Hi all-
>
>  
>
>    Yes, a 60Hz strobe should be applied to the outer dot ring.  I 
> found an LED nightlight that worked nicely, and verified our little 
> science fair project (it also worked on my turntable).  In my case 
> there was very little variation in the flywheel stability.
>
>  
>
>    -Bruce D.
>
>
>
>
> .
>
>