7-100 9V adapter use

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Posted by Steve Garner on December 28, 202001 at 17:18:18:

I have a Pignose 7-100-(R) amp. I would like to use a 9V adapter, but there is no diagram on the amp showing the polarity.

1. Does the positive need to be on the inner or outer part?
2. How many mA (milliamps) are required?


Thanks,

Steve G.

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