[GreenKeys] GreenKeys Digest, Vol 264, Issue 7

[Todd Silk]

Paul at RTTY electronics still has some TV print heads. I don't know how different they are from what came on your machine originally.

mr_rtty at pacbell.net

Todd


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Subject: GreenKeys Digest, Vol 264, Issue 7

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Today's Topics:

   1. Re: WANTED: ASR 33 Print head (B Degnan)
   2. AN/TGC-1A - first torn-tape relay system - Lives! (Duncan Brown)


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Message: 1
Date: Wed, 14 Jan 2026 19:09:25 +0000 (UTC)
From: B Degnan <billdeg at aol.com>
To: "greenkeys at mailman.qth.net" <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] WANTED: ASR 33 Print head
Message-ID: <831937567.190594.1768417765238 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

<snip>
> Hi folks,
> after feeling flushed with success (thanks to many on this list) from my previous ASR33 restoration last year, I have taken on another?
> project.
>
> Apart from being a in a poor cosmetic state (its filthy after spending its life in a CNC workshop), if you take a look at the pictures in the > vintage computer thread at the link below, you will see that the unit has been run without the rubber cap on the print head hammer. As a result, the head has been damaged and needs to be replaced.

> Does anyone have a spare print head they can sell me please ?

> Note I have the rubber caps thanks to Dave Tumey's marvellous efforts at reproducing them

> Thanks

> Ian

> https://forum.vcfed.org/index.php?threads/teletype-33-southern-uk-trade-for-qbus-cards-free.1255988/
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<snip>
I hope you find one, I don't know how difficult it is, you might end up having to buy a parts unit to get the print head from it.
Bill


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Message: 2
Date: Wed, 14 Jan 2026 18:05:40 -0500
From: Duncan Brown <duncanancy at earthlink.net>
To: Green Keys <greenkeys at mailman.qth.net>, CommCenter1
        <CommCenter1 at groups.io>
Subject: [GreenKeys] AN/TGC-1A - first torn-tape relay system - Lives!
Message-ID: <5a1b2c69-2af4-483b-a2f9-d7f9cd92cf07 at earthlink.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Probably the only remaining AN/TGC-1, Torn-Tape Relay Set, designed in
WWII,? just arrived at the AWA Museum today.



This was the first unit designed for store-and-forward relaying of
teletypewriter messages. It was designed in 1943 by the Postal Telegraph
Co. and then continued by Western Union (after they merged with Postal
Telegraph). It consisted of two M14 typing reperforators and a 3-headed
tape reader. It was initially known as "Package Unit SC-1A" when Western
Union put them into production in 1944. Soon after, using the new
Army-Navy naming system, its designator was changed to AN/TGC-1. They
were used extensively by the US Army & Navy during WWII, along with
other government agencies and WU up until about 1960.

Before this equipment was available, all teletypewriter message relaying
(like with the telegraph) was done by hand. An operator would receive a
printed copy an incoming message from one circuit, and then would have
to hand type the message onto another circuit.? With the AN/TGC-1, a
message would be received on perforated tape. An operator would tear off
the tape from the reperf, read the address and take it to the proper
tape reader on another circuit to send it on its way. Thus "Torn-Tape
Relay".

This unit is labeled as an AN/TGC-1A", but there are labels for six MWOs
(Modification Work Orders) on the cabinet and I assume that the unit has
been?upgraded to a "TGC-1B" or even a "TGC-1C".

It looks like it may never have been put in service, but it has been
knocking around for at least 60 years and there is some wear. Also it is
missing its "Signal Indicator Panel" and the tape bin, but hopefully I
can resurrect them and get it operational.

More to come.? 73,

Duncan Brown, K2OEQ
USASA? ? 31J30

Antique Wireless Association
 ?Communication Technologies Museum
 ? ?Asst. Curator, Commercial Equipment
(also chief TTY op & repairman)

i-Telex: 212503

www.antiquewireless.org<http://www.antiquewireless.org>
Virtual AWA Museum TTY Tour: https://www.youtube.com/watch?v=TpB6jM90VV8

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