[Boatanchors] AR-88LF HB Pre-selector: UPDATE

[Edward Swynar]

Hi Carl,

Yes, the 6GM6 is a FB tube as well, no doubt about it...

~73~ Eddy VE3CUI - VE3XZ


***************************************


----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Edward Swynar" <gswynar at durham.net>; <boatanchors at mailman.qth.net>
Sent: Tuesday, April 14, 2009 7:46 PM
Subject: Re: [Boatanchors] AR-88LF HB Pre-selector: UPDATE


> Some of the audiophools pay big Pesos for that tube as its used in a few 
> high end FM tuners.
> 
> I prefer the 6GM6
> 
> Carl
> KM1H
> 
> 
> ----- Original Message ----- 
> From: "Edward Swynar" <gswynar at durham.net>
> To: <rca at mailman.qth.net>; <antiquewirelessassociation at egroups.com>; 
> <boatanchors at mailman.qth.net>; "Welcome to the Novice Rigs List!" 
> <novice-rigs at mailman.qth.net>; <AmRadGear at yahoogroups.com>; 
> "homebuilttuberadios" <homebuilttuberadios at yahoogroups.com>; 
> <hbr at mailman.qth.net>
> Sent: Tuesday, April 14, 2009 3:16 PM
> Subject: [Boatanchors] AR-88LF HB Pre-selector: UPDATE
> 
> 
> > Good Day,
> >
> > Wow, and DOUBLE wow...!
> >
> > I did some research through my 1971 edition of the "Sylvania Receiving 
> > Tube Manual", in a quest for possible "hotter" tube substitutes for 
> > the 6DK6 that I placed inside my recently homebrewed AR-88LF 
> > pre-selector:
> >
> > http://www.flickr.com/photos/15888272@N05/?saved=1
> >
> > I found several with the same pin-outs as the 6DK6, but by far, *THE* 
> > hottest candidate appeared to be the 6JK6 (almost TWICE the 
> > transconductance / mu of the former)...and, as GOOD luck would have 
> > it, ye olde junque box yielded a "primo", NIB Sylvania-brand 6JK6.
> >
> > I''ve just finished installing it inside the pre-selector, and as I 
> > said earlier, wow and DOUBLE wow...! This thing is REALLY smokin' 
> > now --- indeed, on the lower frequencies, I have to retard the 
> > pre-selector's RF gain somewhat to keep it from "taking off".
> >
> > But what a minor inconvenience, when compared to the tremendous and 
> > VERY worthwhile improvement this small tube has afforded the rig's 
> > overall sensitivity...
> >
> > If you're at all contemplating the construction of a pre-selector for 
> > YOUR BA receiver, do consider acquiring a supply of the 6JK6 tube ---  
> > I don't think you'll regret your decision!
> >
> > ~73~ Eddy VE3CUI - VE3XZ
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