[Boatanchors] EF Johnson thunderbolt

[KA2PTE]

Right, The ones I said are 100V are the 0C3, which are 105V not 100.
The stock bias tube is an 0A3 at 75v.

The amp did not like the 0C3 tube as the bias tube, and I dont have an 0B3 
to try,
but it didnt seem to mind the 0D3 as the bias tube.

--
Steve Hearns [ KA2PTE ]


----- Original Message ----- 
From: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>
To: "Boat Anchors List" <boatanchors at mailman.qth.net>; "KA2PTE" 
<ka2pte at 3950.net>
Sent: Thursday, July 08, 2021 8:30 PM
Subject: Re: [Boatanchors] EF Johnson thunderbolt


VR octal tubes were:

VR-75 = 0A3
VR-90 = 0B3
VR-105 = 0C3
VR-150 = 0D3

7-pin miniatures were:

0A2
0B2
0C2
0D2

IIRC

73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10