[Milsurplus] Re: [MRCA] ARR-41 Dyno deck

[J Forster]

Ray Fantini wrote:

> The 240 volt transformer would be a better solution but have bunch of 24/120 transformers laying around.

Many of the older CD players and stereos and the like have 120/240 transformers, FWIW.

> Trivia! did you know that the ARC-38/618S1 power supplies used the raw 115/400 cycle AC input feed to a half wave doubler to develop the 250 volt B+ for the receiver and exciter stages? lot like the old hot cassie TV stuff of the fifties and early sixties. wonder if that's where Collins got the idea?
> Ray Fantini KA3EKH

400 Hz is a lot easier to filter well (only about 1/7th the C is needed) than 60 Hz.

Best,
-John