[MRCA] Fwd: Fw: [VHFcontesting] 222MHz tube amplifier help - AM-456A/TRA-19

[Steven Board]

Anyone have any idea what this is and any documentation on it??
Tnx & 73
DE KA1LHZ
---------- Forwarded message ----------
From: Walt Murphy <n2wm at centurylink.net>
Date: Sun, Nov 22, 2015 at 9:54 PM
Subject: Fw: [VHFcontesting] 222MHz tube amplifier help - AM-456A/TRA-19
To: Steven Board KA1LHZ <sboard.ka1lhz at gmail.com>


Please read email below.

       Have you any idea what a AM-456A/TRA-19 is?????

                 If not military could be FAA as they use military type
numbers to ID Equipment.

                                73
----- Original Message ----- From: "larry" <zm1267 at gmail.com>
To: <VHFcontesting at contesting.com>
Sent: Sunday, November 22, 2015 9:33 PM
Subject: [VHFcontesting] 222MHz tube amplifier help - AM-456A/TRA-19


  Hello all, I'm trying to resurrect this amplifier I found today at a
> local antique store. It appears to be for the 222MHz band, and uses a
> 4CX250 tube. It is currently missing several tubes in the Power Supply
> section (V101, V102, V103 which look to be the rectifier tubes, and V105
> which I'm guessing is maybe the time delay), and I could not locate
> anything of value on the web as far as schematics go. I took a peek
> underneath the PS to see if it's been updated with diodes, but there isn't
> anything extra added. Plus, there are 4 wires connected to V101 - 2 coming
> from the transformer, and 2 leaving and connected to V102. It appears to
> have been modified for the Amateur frequencies already or was in the
> process of being done, and I'm hoping it's on 222. Would someone have any
> idea what tubes I could use in this old beast, or a conversion article or
> tips on upgrading old military power supplies to SS? The transformer has a
> 1500V secondary if that helps any.
>
> It looks like I've found my winter project ;-)
>
> Thanks for your help,
> Larry
> N1MIW
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting at contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20151125/09506c0e/attachment.html>