[Hallicrafters] HT-32B 7360 Modulator Balance

[David C. Hallam]

Mike,

Yes, the 6AR8 has a different pin out.  The replacement requires some
rewiring and replacement of a component or two.  The 6JH8 is, I believe, an
even better replacement.  The same rewiring applies.

73
David

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Mike Lopez
Sent: Tuesday, December 14, 2004 8:24 PM
To: dhallam at rapidsys.com; Mark Shaum; Hallicrafters List
Subject: Re: [Hallicrafters] HT-32B 7360 Modulator Balance

 6AR8 has a different base pin out from the 7360, doesn't it?
Mike N8AZC

----- Original Message -----
From: "David C. Hallam" <dhallam at rapidsys.com>
To: "Mark Shaum" <k9tr at dtnspeed.net>; "Hallicrafters List"
<hallicrafters at mailman.qth.net>
Sent: Tuesday, December 14, 2004 9:04 AM
Subject: RE: [Hallicrafters] HT-32B 7360 Modulator Balance


> Mark,
>
> I didn't think of a mu metal shield.  My HT-32B does not have one on the
> 7360.  I'll see about getting one.
>
> I guess another solution is to change the 7360 to a 6AR8.  The 6AR8
doesn't
> seem to have the problem with external magnetic fields disturbing the
> balance (or at least not nearly as great) and they are a whole lot
cheaper.
> You can buy a box full of 6AR5's for the price of one 7360.  I know that
> this is a modification that a lot of Swan owners have done to their rigs.
>
> 73
> David
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Mark Shaum
> Sent: Tuesday, December 14, 2004 8:14 AM
> To: dhallam at rapidsys.com; Hallicrafters List
> Subject: Re: [Hallicrafters] HT-32B 7360 Modulator Balance
>
>
> ----- Original Message -----
> From: "David C. Hallam" <dhallam at rapidsys.com>
>
>
> > Does anyone have a good procedure for the probl
> > "Use an old speaker or other permanent magnet to alter the magnet
> pattern of
> > the cover.  To use the magnet, move it a circle above the SB generator
> with
> > the cover closed while observing balance.  When a null is obtained,
> lift the
> > magnet straight up and away.  The null will hold."
> >
>
> Interesting.  I'll try that on my HT-32B this weekend.  I don't recall
> having any issues with carrier suppression but it may be fun to play
> with.
>
> I have some other transceivers with 7360's and note that at least one of
> them has a mu-metal shield over the balanced modulator tube.  These were
> frequently used to shield CRT's from stray magnetic fields but there are
> likely some still available for 9 pin min tubes as well.
>
> 73! - Mark K9TR
>
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