[Milsurplus] 28d7 tube

[Sean Barton]

Also used in the K-1 microphone pre-amplifier running 28V on the plates.

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From: "Rob Flory" <robandpj at earthlink.net>
Sent: Thursday, December 25, 2008 5:24 AM
To: "New Jersey Antique Radio Club" <njarc at mailman.qth.net>; "milsurplus" 
<milsurplus at mailman.qth.net>
Subject: [Milsurplus] 28d7 tube

> Good morning and happy Christmas,
>
> I just came across a new tube, the 28d7 used in the Navy MBF VHF 
> transceiver.
>
> Anybody know other rigs that use it?  Maybe R-392?
>
> Rob
>
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