[Boatanchors] Globe Screen Modulator for HG-303

[D C _Mac_ Macdonald]

The WRL UM-1 Universal Modulator uses a 6U8 tetrode-triode
as speech amplifier stages and a pair of 6L6GB in Class AB1
push-pull as a plate modulator capable of 45 Watts output.
It matches a wide variety of load impedances.  It looks to be
very similar in function to the Eico 730 modulator which has
a slightly higher  (50 Watt) output.

The WRL SM-90 is a two tube, 12AX7 speech amp and 12AU7
driver/screen modulator.

73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10

________________________________
From: Rob Atkinson <ranchorobbo at gmail.com>
Sent: Monday, October 12, 2020 15:18
To: manualman <manualman at juno.com>
Cc: D C *Mac* Macdonald <k2gkk at hotmail.com>; Boatanchors QTH <boatanchors at qth.net>
Subject: Re: [Boatanchors] Globe Screen Modulator for HG-303

In 2013 at Ft. Wayne IN hamfest, a fellow was selling a WRL modulator
that went with one of their small CW rigs, the kind that ran a pair of
807s or a 6146 or whatever was at that power level.   I recall it was
a small chassis with at least two glass miniature tubes, about the
size of 6BQ5s.  He said it was very rare.  I'm not a collector so I
looked at it briefly as a curiosity and moved on.  Maybe that was it.

Rob
K5UJ

On Mon, Oct 12, 2020 at 2:59 PM <manualman at juno.com> wrote:
>
> According to info I found, the modulator targeted for the HG-303 was
> called HG-303M. Never seen one. Supposely there is an ad in Decmber 1962
> QST that mentions this modulator.
> WRL Globe did offer the SM-90 which was a Screen modulator. They also
> offered a universal modulator called the UM-1.
>
> Pete, wa2cwa
> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.manualman.com%2F&amp;data=02%7C01%7C%7C70d4a3d7ca604305cda708d86eec0a1f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637381307337461589&amp;sdata=%2FAe6MTaW6z6Mh1DLtaFjNGXsDYVOtaP6gygssXcYZf0%3D&amp;reserved=0