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

[Jordan Arndt]

After a few google searches, it appears that these CV133 tubes I have are 
Marconi Osram tubes...I did search a few years back with no luck finding 
identically labelled tubes with no luck at that time.

73...Jordan VE6ZT


----- Original Message ----- 
From: "Jordan Arndt" <Outposter30 at shaw.ca>
To: "Jacques Fortin" <jacques.f at videotron.ca>
Cc: <r-390 at mailman.qth.net>
Sent: Monday, July 01, 2024 5:57 AM
Subject: Re: [R-390] R-390A 6C4 Mixers


> 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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