[ARC5] AVA-126 vibrator tubes

[Craig]

HI Jack, Thanks for the info. I took a little time this morning and 
opened my unit up and checked the tags to be sure. Turns out mine is a 
126 and not an "A".  I've got to dig around a little see, but I think I 
did buy a copy of the manual a while back. Things are bit disorganized 
here in my office right now.

Craig

KF5JOT

On 1/19/19 12:32 PM, Jack Antonio wrote:
>
>
>> On 1/17/2019 10:24 AM, Craig wrote:
>>> Anyone have a supply of, or a source for the MI-19602-2 12 volt 
>>> vibrator for an AVA-126A power supply? I recently managed to acquire 
>>> one with an AVR-100 receiver, but it has the 6 volt vibrator tube. 
>>> I've seen that someone does build a solid state replacement, but I 
>>> haven't seen anything on how well it would work with the -126A. 
>>> Cowtown Hamfest is this weekend, and I'll be on the lookout there too.
>
>
> It took be a bit longer to dig up the information on the AVA-126 than
> I thought, but finally got to it.
>
> First, there is an AVA-126, and an AVA-126A. The difference is that the
> A version provides for 24V operation. The changes in voltage are
> accomplished by replacing the vibrator unit, and in the case of
> 24V operation, replacing the vibrator and some wiring changes.
>
> Note that wiring changes are also necessary in the transmitter and 
> receivers for operation on different primary voltages.
>
> The RCA numbers are:
>
> 6V  MI-19602-1    RCA stock number 45301
> 12V MI-19602-2    RCA stock number 45302
> 24V MI-19602-3    no stock number given
>
> The stock numbers are the numbers used when ordering
> the units as replacement parts directly from RCA.
>
> Comparing the basing diagram in the manual to the catalogs shows:
>
> 6V  OA or OA-1(depending on catalog, but I don't see a difference)
> 12V OB or OB-1
>
> The 1946 Radiart Catalog shows:
>
> OA  type 5355 for 6V
>          5355-14 for 12V, but the still the same basing diagram,
>                           so it wouldn't work in the AVA-126
>                           or AVA-126A
>
> OB  type 5356-14  for 12V
>     type 5356-28  for 28V, but again, the same basing diagram
>                            so wouldn't work in the AVA-126A
>
> The above types are listed as Aviation types-nitrogen filled
>
> However, the 1945 catalog does not show a cross reference
> specifically to the AVA-126 or MI-19602 numbers.
>
> The 1956 Radiart catalog shows:
>
> OA-1  type 5510
>
> OB-1  type 6511
>
> Both types listed as aviation types, but no mention of nitrogen.
>
> The 1956 Radiart catalog specifically shows these types as
> replacements in the AVA-126, but says there is no replacement for
> the MI-19602-3 24v unit.
>
> My AVA-126A has a 5510 vibrator in it, but the bottom has been taken
> off the the base and rewired to the 12V configuration, again, I don't
> know what arrangements have been made concerning the coil.
>
> I've never come across any replacements in years of searching, but
> maybe the above information will help someone in their search.
>
> Jack Antonio
> WA7DIA
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