[R-390] R-390A 6C4 Mixers

[Jordan Arndt]

Hi Jacques...

I'm not sure if these are Mullard tubes or not...There are no manufacturer 
identified on the tube or the box. Here are 2 pictures I just took. As you 
can see, there is a pin protector/straightener included, but it is not the 
same as the ones used by Mullard.

Apparently, the plate structure has been altered to provide better cooling. 
FWIW, the plates are black and 17mm long...

73...Jordan VE6ZT

----- Original Message ----- 
From: "Jacques Fortin" <jacques.f at videotron.ca>
To: "'Jordan Arndt'" <Outposter30 at shaw.ca>
Cc: <r-390 at mailman.qth.net>
Sent: Sunday, June 30, 2024 9:04 PM
Subject: RE: [R-390] R-390A 6C4 Mixers


> HI Jordan,
>
> I hesitated to mention the Mullards M8080 / CV4058 because I never tried 
> any
> in my R-390As.
> But these box-shaped anode 6C4 / 6100 equivalents are the best-sounding
> version of the 6C4 that are used in many hi-end tube preamplifiers.
> A CV133 can be any variant of the 6C4 because they can came from any
> manufacturer, but not the M8080.
> What about the ones you have ??
>
> 73, Jacques, VE2JFE in Montreal
> 
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