[Premium-Rx] Sylvania R1451A

[aa9il at sbcglobal.net]

Hello all
I have paper copies of the schematics for the 1451 so going
to see if I can get those scanned at Kinko's. I have a 1451 -
an amazing little radio.  I would like to find the VLF version
'someday'
73 de AA9IL
Mike


--- On Fri, 12/28/12, Doxemf <doxemf at aol.com> wrote:

> From: Doxemf <doxemf at aol.com>
> Subject: Re: [Premium-Rx] Sylvania R1451A
> To: premium-rx at mailman.qth.net
> Date: Friday, December 28, 2012, 2:39 PM
> Bill and Al,
> 
> 
> I wonder how much of the circuit is similar to the R-1414?
>  The 1414 has the LO AFC lock derived from the nixie counter
> which is clocked by a separate 1mhz osc located below the
> display motherboard.
> 
> The 1414 also has multipole xtal roofing filters between the
> front end tuner and the first mixer. The first conversion
> circuit has 3 progressively higher frq's depending on the
> band, that are then converted down to 455.
> Also independent SSB and diversity capable.
> 
> I have the manual for the 1414 and The Manual Man might
> still be able to offer a copy.
> 
> Bill, KB3DKS 
> 
>  
> 
> -----Original Message-----
> From: Al Klase <ark at ar88.net>
> To: premium-rx <premium-rx at mailman.qth.net>
> Sent: Fri, Dec 28, 2012 12:39 pm
> Subject: Re: [Premium-Rx] Sylvania R1451A
> 
> 
> Bill,
> 
> Josh Rovero's site contains the basics. 
> http://www.roveroresearch.info/home/boatanchor-radios/r-1451-1
> 
> What do you want to know?
> 
> I one owe of these, and have it running. 
> Architecturally it's sort of a 
> solid-state Hammarlund SP-600 plus ceramic IF filters (by
> Clevite, no 
> less) and independent-sideband capabilities.  The first
> local oscillator 
> is tunable, and a Nixie-tube counter calculates and displays
> the 
> frequency.  There is an AFC that can lock the LO to the
> low-order digit 
> of the counter.
> 
> I have an internal interconnect diagram, but no module
> schematics.
> 
> Al
> 
> On 12/27/2012 10:43 PM, Bill Tweedie wrote:
> > Hi All
> > Can anyone shed any light on this receiver?
> > There are several references on the web but no detail.
> > Bill
>  
>  
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