[ARC5] Fwd: [Bulk] Notes and Tips: RCA AVR-20, AVT-112, AVA-126

[Jim Sinclair]

All,
Please see below. The home brew two transistor vibrators my dad built need a good home. If anyone is interested, I can send photos to them. 
Do not want to dumpster them that is not a good home.
Jim

Sent from my iPad

Begin forwarded message:

> From: Jim Sinclair <sinclair at mc.net>
> Date: October 19, 2015 at 1:30:12 PM CDT
> To: Jack Antonio <scr287 at att.net>
> Subject: Re: [ARC5] [Bulk]  Notes and Tips: RCA AVR-20, AVT-112, AVA-126
> 
> Jack,
> I have been a reader of the ARC-5 list for a couple of years. I saw you mention 12 volt vibrators and transistor vibrators. My dad worked at the Alameda naval air station in WW2 fixing radios and was a ham since 1932. I am sorting his collection and have a couple of listings on eBay for 12 volt 3pin, 4 pin and 6 pin vibrators. The home brew transistor vibrators is what caught my attention. I have two two transistor vibrators, four pin, that are obviously home brew inserted in a vibra-tran can. There is another four pin, two transistor job that won't fit in a can and a last one labeled " needs two transistors". I could email photos if you want. Are any of these of interest? For the home brew ones I was not planning on listing on eBay and was wondering what to do with them.
> Regards,
> Jim
> 
> Sent from my iPad
> 
>>> On Oct 19, 2015, at 12:04 PM, Jack Antonio <scr287 at att.net> wrote:
>>> 
>>> On 10/18/2015 12:33 PM, David Stinson wrote:
>>> Working with an friend of long acquaintance (blessed to
>>> know someone smarter than me!) on ressurecting the popular WWII-era RCA
>>> AVR-20/AVT-112/AVA-126 light aircraft set.
>> 
>> 
>> This is a bit of a nitpick, but just thought I'd mention it for the
>> sake of historical accuracy.
>> 
>> There is an AVT-112, and an AVT-112A.
>> 
>> Both have the capability of field changing the primary voltage
>> (filament and relay) from 6 to 12V, but the A adds 24V capability.
>> 
>> The front panel of the A version has a changeable tag to show the
>> the selected primary voltage.
>> 
>> The non-A has the primary voltage engraved in the front panel.
>> 
>> I don't know if there is an AVR-20 with no suffix, the only
>> documentation I have shows the AVR-20A which shows 6, 12,
>> and 24V filament wiring.
>> 
>> Something similar concerning the AVA-126 and AVA-126A power
>> supplies. The AVA-126 is changeable from 6 to 12V, by changing
>> the vibrator and relay connections. The A version adds 24V capability, again by changing the vibrator, relay connections and removing a jumper.
>> 
>> Replacement vibrators are unobtanium. I thought I'd found some on a
>> website, only to find that the listing was a typo.
>> 
>> My AVA-126A came with a 6V vibrator that had the base rewired for
>> 12V operation. It was so well done, it was not immediately apparent.
>> It also had the 0Z4 changed to a 6X5(with filament dropping resistor). All attempts to restore the unit back to a 0Z4 failed, high current draw and low hi voltage output. So the 6X5 and its resistor stayed.
>> 
>> Jack Antonio WA7DIA/4
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