Since it seemed more appropriate, I posted the following on rec.audio.pro, but
I did not get any replies:

Hi:

In my vintage hi-fi travels, I managed to pick up a mike (or studio?) preamp
made by General Precision Laboratory of Pleasantville, New York. It's a model
AP 6MW with a model number of 5086-5 (PA101 series). It appears to be a well
made unit with top quality parts: Daven level pot, Daven type T691 network
(T-pad, 500/500), UTC A-24 transformer, Sprague caps and Thordason power
transformer and choke. The tube compliment is 5Y3, 6J7 and 6SN7 x 2.

I also got what looks to be the original factory parts list, schematic and
blueprint (I acquired it from the son of a former employee of GPL). Dates on
the documentation indicate that it was made in the early 1950s. Here are some
photos of it:

http://members.aol.com/gerrye123/pre1.jpg

http://members.aol.com/gerrye123/pre2.jpg

Can anyone tell me anything about General Precision Laboratory in general (pun
intended) or this model AP 6MW in particular (like, what was it used for)?
Thanks!

Gerry

[chreynest]

Originally Posted by GerryE123

Since it seemed more appropriate, I posted the following on rec.audio.pro, but
I did not get any replies:

Hi:

In my vintage hi-fi travels, I managed to pick up a mike (or studio?) preamp
made by General Precision Laboratory of Pleasantville, New York. It's a model
AP 6MW with a model number of 5086-5 (PA101 series). It appears to be a well
made unit with top quality parts: Daven level pot, Daven type T691 network
(T-pad, 500/500), UTC A-24 transformer, Sprague caps and Thordason power
transformer and choke. The tube compliment is 5Y3, 6J7 and 6SN7 x 2.

I also got what looks to be the original factory parts list, schematic and
blueprint (I acquired it from the son of a former employee of GPL). Dates on
the documentation indicate that it was made in the early 1950s. Here are some
photos of it:

http://members.aol.com/gerrye123/pre1.jpg

http://members.aol.com/gerrye123/pre2.jpg

Can anyone tell me anything about General Precision Laboratory in general (pun
intended) or this model AP 6MW in particular (like, what was it used for)?
Thanks!

Gerry

Hello my name's Greg and I know (a little on) this old GPL tube audio pre-amp. It was for a 16mm motion picture projector General Precision model #PB-101, optical soundtrack reproduction, manufactured in the early '50s. It mounts inside the base of that unit. I can use that unit and ask if it's for sale. Thank you.