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

Roy Morgan k1lky68 at gmail.com
Sun Jun 30 14:01:45 EDT 2024


At age nearly 80 I don't need tubes to last forever, but it would be nice. 


Les, many thanks for your advice and experience (new- to- me 75A-4 is soon on the bench 🤗).

Roy Morgan
K1LKY Western Mass
K1LKY68 at gmail.com

> On Jun 29, 2024, at 9:47 PM, Jacques Fortin <jacques.f at videotron.ca> wrote:
> 
> 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,


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