My goto replacement for 6C4s is the British CV133. I've tried 6100, 6135,
6C4 and WA etc. versions from various mfgrs, and I find the CV133 quieter
than the others in almost all cases. I've never had one die or short
internally, which I can't say is the case for the other types.
I'm glad I built up a fair inventory of tubes for the gear I have back in
the day. Lots of them came from the Glacier Hamfest which I used to frequent
annually.
73...Jordan VE6ZT
----- Original Message -----
From: "Jacques Fortin" <[email protected]>
To: "'Byron Tatum'" <[email protected]>; <[email protected]>
Sent: Saturday, June 29, 2024 7:47 PM
Subject: Re: [R-390] R-390A 6C4 Mixers
The 6C4 is one of the first miniature tubes issued.
The "double" 6C4 is a 12AU7.
The 6100 is the Industrial number for a 6C4, which bears the 6189 number
in the double version.
Both the 6C4 and the 6100 have 6.3V, 150mA filaments.
The 6135 is a "ruggedized" version of the 6C4: 6.3V, 175mA filament, the
double version being a 5814.
If the "A" suffix is added to any of those tube numbers, it means that the
heater warm-up time is controlled for use in series strings of filaments.
The W suffix indicates a military spec. version, like the 6C4WA.
However, stay away of the "dwarf" sized 6C4W branded Raytheon, because it
is not a "real" 6C4 and does not behave well as a frequency mixer compared
to the standard 6C4 variants.
73, Jacques, VE2JFE in Montreal
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