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[Tim McCulloch]

If you can let the UPS part go ( how much do you need a UPS for a B3 & Leslie? ) most high end power amps these days are capable of AC input from low 90s to 250 VAC 50 / 60 Hz.  Feed a 60Hz sine wave in ( I think iTechs have built in oscillators maybe Lab Gruppens too ), dial up the gain to get your 120 VAC out and you've got some very clean AC to keep your 1950s technology running.

That's how we did variable speed drive for the 2" recorders in the studio I worked in.  We built the power amps and the recorder circuitry, buying the transports equipped to the studio owner specs.

[David Sturzenbecher]

Just look at all the applications crown amps (essentially) have been used for by the AE Techron guys.


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[John Roberts {JR}]

Back at Peavey we did things like that for testing various SKUs at 50Hz mains frequency.

No, we didn't use Crown amps    (no offense).

JR

PS: Speaking of Crown more than once, the old DC300 amps got repurposed as emergency console power supplies, something you can't do with AC coupled power amps.

[Rob Spence]

Back in 1970 I was working in an engineering lab as a tech. We were developing a drum recorder with 200 tracks which would each have short phrases and the computer would build sentences by switching tracks. The 4” diameter drum turned at 1 rev per 4 seconds.
While the servo circuit for the various motors we were evaluating was being developed, we didn’t want to build drivers for each so we just used a Crown DC300.



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[Pete Erskine]

Thank you, Pete! I never would have found this without you. I literally have been searching the 'net for days. Hopefully it's reasonably priced!
Here's the current model, for anyone interested...
https://www.falconups.com/ups/ed-ups-rackmount.htm

Contacted company... 

Thank you for your inquiry in Falcon UPS products.  The SUP is being discontinued.  The new series are in development and to be released later next year.  It will be universal power IN as well....

Please call or email me if you have any questions.

Sincerely
Ngayi
Falcon Electric, Inc.
(626) 962-7774 x116

[Riley Casey]

Speaking of Crown more than once, the old DC300 amps got repurposed as _ loudspeaker launchers causing at least a few JBL 2205 frames to go to the trash after not being able to remove the remnants of the voice coils from the gaps_  something you can't do with AC coupled power amps.

...snip ...

PS: Speaking of Crown more than once, the old DC300 amps got repurposed as emergency console power supplies, something you can't do with AC coupled power amps.

[David Buckley]

Yeah, plenty of regulators out there, and that one is being discontinued... Thanks, though!

Oops - with the discontinuance of the PCR-Ms, there is now the PCR-MA range, so the new standard then.

These are not regulators in any way shape or form.  They are laboratory power supplies.  They take in whatever you have, and synthesize the voltage and frequency that you want, within the device capability.   Despite them being lab power supplies, turns out if you tour the world they deliver your preferred power wherever you happen to be.

[Andrew Broughton]

Thanks, everyone. I think I found the closest thing I'm gonna find.

https://forums.prosoundweb.com/index.php/topic,168934.msg1558309.html#msg1558309

[ProSoundWeb Community]