Phonoland

Hi folks!
I have a Wurlitzer 2800 I'm about to recap the amp on (and the junction box) and I'm curious about something on the schematics.

As you know, most of the caps in the amp can be replaced with mylar or film caps, and are non polarized. The electrolytics, though, are usually polarized.

On the schematics, in some places, the electrolytics have the positve direction marked. In many places though, the electrolytics don't have it marked (on the schematic)....

In the places where it's NOT marked, it appears all of those caps on the schematic connect to ground.

My question is, was it common practice on these older schematics, to 'assume' that if the cap is connected to ground, that the ground lead goes to ground? Every cap in the scematic that's electrolytic, that doesn't specify polarity direction, is directly connected to ground.

Any help appreciated, hope the question is clear.

Ronnie,
The question is clear as a bell--the answer, however, is not--In WurliTzer's case, that is the way they drew them--other companies may vary-- Ron Rich

In Wurlitzers of that era the amplifier was totally conventional, negative-ground.

However, for some reason they used a positive-ground for the low voltage DC so any electrolytic in the stepper or junction box must be carefully examined as they are connected positive ground.

Rob/NYC

Thanks for the info. Tell me if my logic is correct, so I'll know how to proceed in the future.

I'm thinking, that if you have an electrolytic, you should always connect the negative side, to whatever part of the schematic has the lowest voltage potential. Using that rule, I should be able to figure it out... does that sound correct?

That's correct.

Rob