[Hallicrafters] SX-99 QF-1 help

[Carl]

Its a repackaged SX-24 which goes all the way back to the SX-9. Its similar 
to the S-9 begatting the S-20R, who begat the S-40 family who whelped the 
S-85 ad nauseum.

Add a Kiwa or Murata ceramic filter if you want selectivity and then the 
QF-1 can really do its job.

Carl
KM1H




----- Original Message ----- 
From: "Bry Carling" <bcarling at cfl.rr.com>
To: <n8ie at woh.rr.com>; "'Glen Zook'" <gzook at yahoo.com>; 
<Hallicrafters at mailman.qth.net>
Sent: Monday, April 23, 2012 8:35 PM
Subject: Re: [Hallicrafters] SX-99 QF-1 help


> SX99 is a GREAT receiver for the money, if you can live without a 1 kc 
> readout.
>
> -- 
> Sent from my android "relatively smart" phone. Please excuse my brevity.
>
> _____________________________________________
> From: "Daniel J. Shepherd Sr." <n8ie at woh.rr.com>
> Sent: Mon Apr 23 20:08:58 EDT 2012
> To: 'Glen Zook' <gzook at yahoo.com>, Hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] SX-99 QF-1 help
>
>
> Thanks Glen.
>
> FYI for anyone wanting to add a QF-1 to their SX-99, I connected the RG58
> cable to pin 8 (plate) of V3 (6SG7), the 1st IF Amp. I tapped 205V for the
> B+ from a cap in the HV supply. 6.3VAC for the filament was tapped off V1
> (6SG7) the RF Amp.
>
> This little thing is a great addition to the receiver!
>
> 73
> Dan, N8IE
>
> _____
>
> From: Glen Zook [mailto:gzook at yahoo.com]
> Sent: Monday, April 23, 2012 3:00 PM
> To: n8ie at woh.rr.com; Hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] SX-99 QF-1 help
>
>
>>From the positive connection on the high voltage filter capacitor would be
> one place.
>
> Glen, K9STH
>
>
> Website: http://k9sth.com
>
> _____
>
> From: "n8ie at woh.rr.com" <n8ie at woh.rr.com>
> To: Hallicrafters at mailman.qth.net
> Sent: Monday, April 23, 2012 1:46 PM
> Subject: [Hallicrafters] SX-99 QF-1 help
>
>
> Hello all,
> Just acquired a Heathkit QF-1 to use on my Hallicrafters SX-99.
>
>>From the QF-1 manual, I hook the coax connector to the plate side of the
> input IF transformer or the plate connection of the mixer tube at the
> socket. From looking at the schematic of the SX-99 it appears to be pin 8 
> of
> V3 (6SG7), the first IF Amp. Is this correct?
>
> I know I can get the filament voltage from the transformer, I need to 
> ground
> one side to the chassis and the other I can tap off pin 7 of either V1,2,3
> or 5. I need to find a good place to get B+ (120V to 300V). Any
> recommendations for this?
>
>
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