Categories: Technical

From the why-didn’t-i-think-of-that-first file – Great EZ hack for Octal can transformers

Via this eBay auction: a UTC A-12 mounted on a plate-retained octal plug, with the pins wired to correspond to the pin-out of an Altec 4722 input transformer.

It had simply never occurred to me that the mounting-diameter of a UTC A-series corresponded to the mounting-diameter of those octal-mount plates.   Well done sir.  Great idea if you have an Altec 1567, 1566, or ANY piece of old pro audio gear that uses octal transformers – and a great many do.  RCA, Newcomb, Ampex, the list goes on….

chris

View Comments

  • An astonishing variety of stuff was octal pattern sockets and plugs. Even the electroluminescent dash power supply for a Chrysler Turbine Car.

    There were also nine, eleven, and 20 pin octal (sic) sockets and plugs. The 20 had two rows like an old French pinfire revolver.

    The bigger 14 and 16 pin keyed sockets for CRTs were used that way too. Jones plugs and the D-subminiatures did away with most of that in the seventies.

  • Any idea where to get a "plate retained octal plug"?I'd like to put a UTC into the mic input trafo octal plug that comes standard with the Ampex 601 mic/line tape input electronics.
    Cheers,Richard.

Recent Posts

PSR June 2024: Japanese rock, folk, psych, and soul 1968-1982

Im back from 2 weeks in Japan, time that I primarily spent hunting for records.…

1 day ago

New LP ‘Secular Music Group Vol 1’ + New Haven Live Date 6.30.24

On Friday June 30 LoveAllDay Records will release my new LP "Secular Music Group Volume 1"on vinyl…

1 week ago

Preservation Sound Radio May 2024

This month's Preservation Sound Radio program will air tonight Tuesday May 21 at 8:30 PM.…

4 weeks ago

9sides: Preservation Sound Radio March 2024

This month on Preservation Sound Radio: nine side-filling tracks from 1970 thru 1986, all from…

3 months ago

Preservation Sound Radio Feb 2024: best new (old) tracks

This month's show airs Tuesday 2.20.24 at 8:30PM -11:25PM EST on WPKN 89.5 FM in…

4 months ago

PSR January 2024: Contemporary Jazz 1967-1980

The first Preservation Sound Radio program of 2024 will air Tuesday January 16 at 8:30PM…

5 months ago