[Hallicrafters] HT-32B 7360 Modulator Balance

[David C. Hallam]

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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