DYNACO Pre-Amp PAT-4...with an added Volume knob


I just purchased this pre-amp
It sounds good but someone added a volume knob in substitute of 
the input headphone jack.
I looked inside of unit , there is a volume pot installed instead of input jack.
Has anyone ever seen this modification before?...if so , what is it used for?
Thank you
rocky1313

Showing 1 response by atmasphere

Not heard of that. You might hook it up and see what happens- does it control the main outputs? Does it control the recording outputs? That will give you a good idea if you need to do anything about it.