SB 301 LMO tubes

[Stu Lyon]

Strange! My SB-301 manual, dated 7-29-66, shows a 6BZ6 both in the overall
schematic and the LMO schematic.

However, there was a 3-page modification letter dated 1-6-69 which added a
470K load to the AM detector. The partial schematic relating to that mod
shows the LMO as having a 6CB6. Since both tubes have the same base (7CM), I
would replace whatever is in there with the same type to maintain the
calibration.

The SB-100, -300 and -400 used the 7BK based tube (6BA6, etc) which is not
interchangeable with the 7CM base.

73, Stu W6CUX
Winnetka, CA
w6cux at earthlink.net

----- Original Message -----
From: "Stanley White" <swhite at CA.INTER.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, October 08, 2004 6:45 PM
Subject: SB 301


SB 301 users,

 In the main Shematic it says to use a 6BZ6 in the LMO and in the LMO
Shematic on page 95 it says to use a 6CB6..I wonder which is the proper one
to use.????
                                Thank you,Stan,,VE3FKD/VE3GN

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