[Hallicrafters] Determining age of SX-71 ??

[Phil Atchley]

Thank you Deane
It looks like I'd do pretty good to put the date of manufacture on the SX-71
as 1953 (which I think was the last year of manufacture for these sets)
73 de Phil  KO6BB

> > 6SK7  3-04,   188-5
> > 6SH7  2-48,   274
> > 6SK7  3-04,   188-5
> > 6H6    2-39,   274
> > 6AL5  33  10  29
> >
> > 73 de Phil  KO6BB
> >
> 2-48 = 48th week of 1952
> 3-04 = 4th week of 1953
> 2-39 = 39th week of 1952
>
> Later date codes used the last two digits of the year,
> for example 61-16 would be 16th week of 1961. My SX-110 for example
> still has all of the orginal Halli tunes, all with 1961 date
> codes.
>
> Note sure arout the 6AL5 code.
>
> The other numbers code for the manufacturer of the tube
> -188 = GE and 274 = RCA.
>
> 73, Deane McIntyre VE6BPO
> dmcintyr at ucalgary.ca
>


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