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R-1451

The R-1451 a mid-sixties era solid-state BA.  It still has 6 tubes, the nixies in the frequency readout.  Photos by Robert Nickels, Roy Wildermuth, Todd Roberts and me.  According to the tags, the earlier R-1451 was part of the "Water Boy 1" system, while the R-1451A was part of the WLR-6.  The R-1449 VLF receiver is part of the same systems.


Additional front panel detail photographs here and here.

Basic specs are:

0.5 to 32 MHz in 6 harmonically-related bands.  There is an AFC circuit that can be tuned to lock the frequency on any 100 Hz multiple.  Single conversion 0.5-8 Mhz,  double conversion above 8 Mhz. The receiver supports AM, CW/SSB, ISB and (R-1451A only) "FMA" modes of reception.

IF filters for 16, 8, 4, 3 (ISB only), 2, 1 and 0.1 KHz bandwidths.  Clevite ceramic filters are used for 16, 8, 4, and 2 KHz.  Collins mechanicals are used in the ISB module.  The 1 and 0.1 KHz bandwidths are obtained with single crystal filters.  A broadband 455 KHz IF output is provided on the rear panel, in addition to separate AM/CW/LSB and USB audio outputs.


The model number is not stated on R-1451 serial number 4.  Each individual module and circuit board is also serialized in single digits.  The label plate says "Sylvania HF Manual Receiver, Part of Water Boy 1 System".  The corresponding tag for this R-1451A shows it as part of WLR-6 ESM suite.


Another interesting feature is a retractable spinner-crank on the inner tuning knob.  The outer knob is slow speed reduction tuning, inner knob high speed tuning, and pull the spinner from the center of the inner knob -- it extends on an arm for really high speed tuning.   Interior construction is modular, but very cramped.

Please contact me, Robert Nickels, Roy Wildermuth, and Todd Roberts if you have any additional information on this series of radio.

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Josh Rovero,
Oct 14, 2012, 9:24 AM
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Josh Rovero,
Oct 14, 2012, 9:24 AM
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Josh Rovero,
Oct 14, 2012, 9:24 AM
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Josh Rovero,
Oct 14, 2012, 9:24 AM
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WLR6_r.jpg
(203k)
Josh Rovero,
Oct 14, 2012, 9:24 AM
ą
WLR6_s.jpg
(199k)
Josh Rovero,
Oct 14, 2012, 9:24 AM
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Josh Rovero,
Oct 14, 2012, 9:24 AM
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Josh Rovero,
Oct 14, 2012, 9:24 AM
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