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

[Carl]

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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