[HAM] CV - No Vibrato -PR20 -No Reverb

[David Damroze]

On Apr 24, 2007, at 9:26 AM, mtcasino wrote:

> That is a reverb switch kit. Transformer, resistor, capacitor & switch.
>
> On the back of the pre amplifier the ground and vibrato ground connect
> together.
>
> They should be labeled "GND" & "VIB GND".
  They are . I connected them with a jumper and it still didn't work.
  That's why I'm wondering if the ground needs to connect someplace else 
as well.
  Direct to chassis ?

DD
>
>
> <snip>
>
>   The Vibrato on the CV and the Reverb on the PR-20 are both not 
> working.
>   I have had all of the tubes tested and replaced the bad ones.
>   There is a Reverb unit by Edward Controls in the organ which
>   I have disconnected while tracking down other issues . Also , I 
> figured
> I didn't need it since there is reverb in the tone cabinet.
>   Could I have disrupted the ground circuitry when I disconnected the
> reverb unit ?
>    According to the PR-20 schematic there is an optional reverb switch
> that mounts at the
> console that seems to work mainly by disrupting ground to the cabinet.
>   If the G terminals are hooked up but ground is not , would I still 
> get
> sound through the
>   tone cabinet ? Is it possible that a broken ground someplace would
> cause the reverb and
> vibrato not to work ?
>   Where does the ground terminal actually connect to ground?
>   David D.
>
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