serge knobs

[Bill Layer]

Hi Plinio,
>
>-I am a determined beginer synth builder and managed to get my hands on a
>scope.  I saw it working before I took it home, but later, after being 
>on for about five minutes, the screen went blank and never again showed
>anything.  I let the scope cool down and still nothing, it powers up fine
>but no display. 

Three distinct possibilities come immediately to mind:

1) Failure of the VERT or HOR positioning; this can be due to dirty pots or
loss of control voltage.

2) Failure of intensity circuit; same causes. Like #1, the scope is working
fine, but the trace is simply not visible.

3) Loss of high voltage. In a darkened room, is ANY light visible from the
screen, or is it completely dark? Total darkness would indicate a loss of
HV.  
>
  I thought it might be a stereo amplifyer by the way it was connected
>inside the record player I picked of the sidewalk)

Probably correct. There s nothing else inside a record player that would
require a large heat sink. Most 'packed' stereo amps are a SIP type,
heatsinked one side, printed on the other. Usually marked with "STK" plus
some numbers. 


Bill Layer
"Quantity has a Quality all of it's own." -JL