Collins Transformer Datasheet?

MrG · Nov 2, 2018

Hey all,

Does anyone have a link to a solid datasheet for these trafos? Specifically the PA-1A?

Thanks in advance.

Mark

emrr · Nov 3, 2018

I know Collins pretty well and I don’t know what that is.

MrG · Nov 3, 2018

Thanks, Doug.

Here’s a photo to help potentially solve this mystery. Any thoughts?

Thanks much,
Mark

scott2000 · Nov 3, 2018

looks like a phono pre amp????

found this clue too???

http://www.hf-antenna.com/Flotsam/Console1010/AG1010-4.jpg

emrr · Nov 3, 2018

those aren't transformers, they're plug in SS amps.

MrG · Nov 3, 2018

EmRR said:
those aren't transformers, they're plug in SS amps.

Thanks, Doug. Do you happen to know how they affect the signal? Is it a ratio thing or is it a several fixed settings? What are impedances in and out?

Thanks again,
Mark

scott2000 · Nov 3, 2018

..they kinda looked like things with Triad A-67J inside....

https://reverb.com/item/6379270-autogram-mt-1-150-600-ohm-line-input-transformer-250020-1-triad-a-67j-in-can-used-in-collins-mixer

http://crochambeau.blogspot.com/2011/02/this-past-week-has-been-one-obstacle.html

emrr · Nov 4, 2018

Yeah, this is Autogram era, probably not even Collins design. These sorts of amps exist in Altec, Collins, Gates, and others. SS plug-ins. Little to no value other than people with those consoles.

abbey road d enfer · Nov 11, 2018

MrG said:
Thanks, Doug. Do you happen to know how they affect the signal? Is it a ratio thing or is it a several fixed settings? What are impedances in and out?

Thanks again,
Mark

These are not transformers. They are phono preamps. 47 kohm input impedance, nominal level about 5mV, frequency response according to RIAA curve.

Collins Transformer Datasheet?

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