[ARC5] Vibrator Power Supplies

Tue Nov 21 10:00:07 EST 2017

Not that it is particularly germane to this discussion, but Gonset used vibrator supplies for both sides of their famous G-66 receiver/G77 transmitter Gonset Twins combo.  I never had a vibrator failure in the years I had these.  These were, however, fairly modest power requirements and vibrator technology was pretty well established at the time and eliminated the dynamotor requirement and could be set up for either 6V or 12V operation.

73 de Mac, K2GKK/5
(Since 30 Nov '53)
Oklahoma City, OK
USAF Retired 61-81
FAA Retired 94-10

________________________________
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on behalf of Mike Morrow <kk5f at earthlink.net>
Sent: Tuesday, November 21, 2017 07:35
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Vibrator Power Supplies

Scott wrote:

> My own suspicion--unsupported by any specific evidence--is that
> vibrators were thought to be unreliable. The fact that you can change
> one out in about 15 seconds seems not to have mattered.

I'd agree that reliability/component life issues mitigated against much vibrator use.

In the immediate post-WWII era we find:

The long-serving ADF receiver R-101/ARN-6 used a vibrator power supply.  A spare vibrator is held in a bracket under the top cover.

There is a military configuration of the A.R.C. Type 12 that incorporated a SCR-619 (BC-1335) FM set, all controlled through an A.R.C. C-37 control box.  The BC-1335 uses a vibrator power supply.

The pre-WWII RCA AVT-15 transmitter had an integral vibrator power supply that also served the AVR-15 or AVR-20 receiver.  Another similar system is the AVT-112 transmitter with AVR-20-A1 HF receiver and R-76/ARR-13 beacon band receiver...all three powered from the same pre-WWII AVA-126 vibrator power supply.

I'm sure that several other vibrator-powered sets could be identified.  The characteristic they all have in common is low HV power requirements.

If I leave the world of aircraft sets, I associate the term "vibrator" most strongly with the AN/GRC-3 series of tactical FM radios.  There's not a dynamotor anywhere in the system.

Mike / KK5F
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