[Hallicrafters] SX25 mods

[Peter May]

I have both 5Y3Gs and 80s here, they both look the same once socketed in the
set.
Later 80s were also available in the GT size over here in the land of Oz, I
dont know about the States.
It's always good to make the set original if you can.
But how far can or should you go? Where do you get .05 mfd caps these days?
Everyone uses .047 mfd greencaps, so it is not original.
Sometimes a modification is kept because the set is made more functional or
practical as well. I'm not endorsing making hybrid solid state rectifier
set-upps either although I've seen this in some sets from govt departments.

I have an Airzone AC/DC console radio here that has been rewired with side
contact dutch Philips valves.
Why is it so? I hear you ask (apologies to Professor Julius Sumner Miller).

During WW2, there was a shortage of all US numbered valves (tubes) used in
allied radio equipment, the services did not use the side contact valves (O
series and A series) so this Airzone set was completely rewired using the
Philips valves because of practicality and availability, it's a real curio!

Most collectors hate Philips side contact "P base" tubes, I know I do! Some
people say "put the set back to original".

That's a lot of work, it would still sound the same and then it would'nt
have an interesting story attached to it!



Regards
Peter
http://www.geocities.com/SiliconValley/Network/9166/junkbox.html
----- Original Message -----
From: <johnph3 at juno.com>
To: <peter_may at optusnet.com.au>
Cc: <chandler2 at aol.com>
Sent: Tuesday, November 23, 2004 10:57 PM
Subject: Re: [Hallicrafters] SX25 mods


> Yes it is true the 5Y3 is the same as an 80 except the base style, but in
> the interest of keeping one original I would prefer using
> an 80. They are not that hard to find. And an older style 80 looks
> impressive in the radio. I guess only if your interested in
> the nostalgia of it.
> John
> On Tue, 23 Nov 2004 16:36:22 +1100 peter_may at optusnet.com.au writes:
> > I think the 80 and the 5Y3 are the same electrically.
> > >From memory the main difference was the 80 had a 4 pin base and the
> > 5Y3 had an
> > octal. It was probably quite a practical upgrade.
> >
> > Regards
> > Peter May
> >
> >
> >
> > > chandlerh2 at aol.com wrote:
> > >
> > > hello to all this is my 1st post here and i am somewhat of a
> > novice
> > > working
> > > on these radios  but i do know enough to work on them . i love
> > > hallicrafters
> > > and have about 8 of them now all in working order including a mint
> > SX24
> > > and
> > > SX25. i have completely recapped my SX25 and one shematic i have
> > shows
> > > to use a
> > > 6AB7 in the 1st RF stage and also a 5Y3 rectifier tube instead of
> > an 80
> > > . are
> > > any mods necessary to use the 6AB7  and would i see any
> > preformance
> > > gains ???
> > > any info would be appreciated
> > > thanks  steve
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