[Hallicrafters] S-40A Tube type change?

[Roger D Johnson]

rbottomleysr at dslextreme.com wrote:
> I have an S-40A with a type 80 tube in it. Does anyone know when the
> rectifier in the S-40A was changed to a 5Y3?
> Back in about 1958 I wrote to Halli and asked for a service manual and
> they sent me an Installation and Operating manual dated October 1949, form
> 94x519, and a Service Bulletin for Model S-40A dated Jan. 1950, form
> 94x385, run No. 3. Both these documents show the rectifier type as 5Y3GT.
> Any help out there on change dates?

According to Dachis' book, the 5Y3 was used starting in run 3. However,
no date is given.

73, Roger



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