Type of tube in SB-301 LMO?

[Russ Hines]

Hi Stewart:

The SB-300/400 used a 6AU6 in the LMO, the SB-301/401 used a 6BZ6.  Those
are the tubes Heath used in these circuits, although there may be 301/401's
with 6AU6's because they use the older style 300/400 LMO.  The 6CB6 was a
popular "mod" substitute for the 6BZ6.

73,
WB8ZCC

Stewart Lyon wrote:
>
> Hi gang,
> I checked four LMOs from various vintages that I have and they used
> either a 6BZ6 or 6CB6. These tubes are pinned out the same and their
> other characteristics are similar so it probably wouldn't matter which
> one you used. They have the "7CM" base.  The 6AU6 is based "7BK" which is
> differant in that the supp. grid and the cathode are switched. You can't
> sub one type for the other unless the cathode and suppressor are tied
> together in the wiring ( which RCA recommends even though it's never
> done).
>

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