Question on Hammarlund SP-600 VLF receivers

[Bruce Sugarberg]

Hi Dennis,

"Shortwave Receivers Past & Present - 3rd Edition",
by Fred Osterman, has a complete listing of all 40
SP-600 models.  According to this list, there were
only two VLF models, the VLF-31 (12/54), and the
VLF-38 (3/61).  The only difference between them is
the ac power supply.  In the VLF-31 it was 50/60
cycles.  In the VLF-38 it was 25/60 cycles.

73,

Bruce Sugarberg, WA8TNC
-----------------------
Dennis Gibbs wrote:
>
> Hello everyone,
>
> I have an opportunity to purchase a Hammarlund SP-600 VLF model in
> excellent-mint condition.  The receiver is not local to me, so I cannot
> examine it personally before making the purchase.  I would like to
> determine when this unit was made.  Specifically, I'd like to find out
> if this unit has the infamous black paper capacitors in it.
>
> I spoke with the person selling the receiver on the phone.  There are
> no definite date codes that he could find.  There is no plate on the
> tuner cover like on the traditional SP-600 models.  He could not see
> a date code on the power supply can electrolytic.  He THINKS he sees
> a date code on a capacitor, but he can't tell whether it is 9-57, or 9-67.
>
> There is a sticker on the back of the unit with a number 55752052, but
> this doesn't sound like an SP-600 serial number.  There is something
> written on the side of the chassis that looks like 75-820-I2/5, but it's
> very faint.  The coverage of the receiver is 10-540KHz.  He has an
> original manual for it, that says it's a VLF-31 model, but we don't know
> if the manual matches the receiver.
>
> My questions are:
>
> 1) Assuming it's a VLF-31 model, when were the VLF-31s made?  Do they have
> the infamous black beauty caps in them?
>
> 2) What other VLF versions did Hammarlund make, and when were they made?
> Which ones had the black beauty caps in them?
>
> 3) Assuming MINT condition cosmetically and electrically, how much should
> one of these sell for?
>
> I've seen various lists of the versions of SP-600 receivers, but I still
> can't seem to pinpoint when the VLF versions were made.
>
> Thanks for any help,
>
> Dennis Gibbs
> dgibbs at rational.com
>
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