[Hammarlund] Early super pros

[Bob Young]

I have a BC-779-B which has 5 bands: 100-200, 200-400, 2.5-5.0, 5.0- 10.0, 
and 10.0-20.0. I think that is standard for these. I have a lot of info on 
the three models packed away.

Bob young
Millbury, ma
KB1OKL


>From: Roy Morgan <roy.morgan at nist.gov>
>To: k0ewu9 at juno.com, Hammarlund List <hammarlund at mailman.qth.net>
>Subject: Re: [Hammarlund] Early super pros
>Date: Wed, 28 Feb 2007 14:21:55 -0500
>
>At 11:52 AM 2/28/2007, you wrote:
>>HI hammarlund guys. I have a nice BC-779, the low freq version and would
>>like to convert it to the bc  .54 to 1.24 mc
>
>Jack,
>
>You may have more on your hands than you expect. It *may* be that the 
>BC-779 low frequency radio was a TRF design. That means it has no local 
>oscillator and no IF amplifier section. (I don't know this for sure.  I 
>think that the SP-600 LF was a TRF radio.)
>
>If that is the case, you would be stripping the entire chassis except for 
>audio amp and power supply and starting all over to re-create a new radio.
>
>By the way, I think that the military BC-779 I have has three low frequency 
>bands and then other bands in the HF region.  The low frequency bands are 
>something like 100 to 200 Kc and 200 kc to 400 kc. and 300 to 540 KC.  Here 
>is a message from Robert Downs that gives some details.  Note that he says 
>they are all five band units, so the five bands would be chosen from the 
>more than five he lists.
>
>>Date: Mon, 24 Jul 2000 08:38:55 -0400
>>From: "ROBERT W. DOWNS" <RWDowns_WA5CAB at compuserve.com>
>>Subject: RE: SP-200 Question
>>To: Old Tube Radios <boatanchors at theporch.com>
>>Cc: "[unknown]" <provero at connix.com>,
>>Old Tube Radios <boatanchors at theporch.com>,
>>
>>John, Josh & Group,
>>Comments interspersed:
>>Message text written by john
>> >The supply is a RA84 (not sure whether
>>this is original or not....) which is marked "MWO 11-866-2" " RA84" "LSD 
>>MFP Jul 48"
>> >
>>I don't have that MWO (Modification Work Order) but it is possible that it
>>is referenced in one of the changes to TM 11-866. If I find anything, I'll
>>let you know. The bottom line indicates that the power supply was Moisture
>>and Fungus Proofed by Lexington Signal Depot in July 1948.
>> >It does have a mil tag, indicating:
>>Order # 1428 PH42
>>SN 118
>><
>>The power supply was ordered between July 1941 and June 1942. There were
>>three military supplies made for the Super Pro's, RA-74-(*), RA-84-(*) and
>>RA-94-(*), and up to four revisions of each. The differences between the
>>three supplies are mainly in the primary voltage and frequency ranges of
>>the power supplies. The generic Super Pro manual that I have shows a
>>nameplate on the back of the power supply dust cover (no front view 
>>photos)
>>that says "SUPER PRO POWER SUPPLY", plus a serial number and
>>"HAMMARLUND....". There was a table model with a small front panel and a
>>rack mount model with a 19" panel. The input voltage is 105/115/125VAC @
>>50-60CPS, which happens to be the same as for the RA-84-(*). The input for
>>the RA-74-(*) was 95-130 and 190-260 @ 25-60. The RA-94-(*) was 115/230 @
>>50-60.
>> >Now...can someone explain why Moore doesnt show a SP200, just a 210,
>>when this radio clearly says SP-200X on the back plate....?
>><
>>The commercial manual that I have (undated) originally said just "Super 
>>Pro
>>Receiver" on the cover and title page. Someone has stamped "SP-210LX" and
>>"SPR-210LX" on both sheets. I have a postwar manual marked "SP-400-X". No
>>explanation of what the "L" indicated either.
>>John, I don't believe that you have said what the frequency coverage is in
>>the receiver that you have. According to all of the manuals that I have,
>>all of the SP-1xx/2xx/4xx and the BC-779, BC-794, BC-1004 and R-129/U are
>>5-band. The bands that were supplied that I know of are 100-200, 200-400,
>>and 300-540 KC and 0.54-1.16, 1.16-2.5, 2.5-5.0, 5.0-10.0, 10.0-20.0 and
>>20.0-40.0 MC. What does the one that you have cover?
>>73,
>>Robert Downs
>>WA5CAB
>>Houston
>
>I have seen a Super Pro which had been modified so that one of the low 
>frequency bands was supposed to cover a different band. It never ran while 
>I had it, so I am not sure what had been done.
>
>If what you have is a low frequency plus HF radio, then you may well be 
>able to change one or more of the LF bands to other frequencies.  You would 
>get the needed coils, plug them in and do an alignment
>
>Let's see if anyone else knows more.
>
>Roy
>
>
>
>- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
>13033 Downey Mill Road, Lovettsville, VA 20180
>Phone 540-822-5911   Cell 301-928-7794
>Work: Voice: 301-975-3254,  Fax: 301-975-6097
>roy.morgan at nist.gov --
>
>
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