MFA MC Reference

[reinhard]

Hello Tube Gurus,
can anybody help with schematic and Parts list
for the MFA MC Reference.
Can offer a schematic of MFA Luminescence for that. Don`t ask if you havn´t the above.
Reinhard

[KaLok]

Hi, Reinhard
Pls check old issue Glass audio, it has this schematics (line amp only), it use 6DN7 and 6SN7(or 6SL7, I'm nor sure). It is a MFA Luminescence model A, it has 3 versions: A,B and C, they has a little bit not similar.

[reinhard]

Hello,

the luminescense is an Bruce Moore design using oktal tubes throughout. The MC reference uses miniature tubes and when my information is right, it is a design of Arn Rothcap.

I have the issue of GA with the line amp.

Thanks,
Reinhard

[KaLok]

The schematic may be model A, special for LP source, the different is the NF part.

[jlpguilbert]

I have in my system this absolutely fantastic preamplifier !
and good news for you i have the complete documentation !
i can make you a copy and send by postal way if you want.

Probably you can help me ... i replaced the 6922 tube in preamp by others 6922 but ..... in the power supply box there is a big rectifier tube called 9330 from penta laboratories ! impossible to find it , so is it the good reference ? no informations in the documentation .... all schema for preamp box but no details about the last tube i would like to replace .....

and internet site from pentalaboratories.com don't react .....from France ! ( you could try from another location ?)

picard.jeanlouis@free.fr

[KaLok]

Maybe I check it in HK or asked some of my friend who know.

[fdegrove]

Hi,

box there is a big rectifier tube called 9330 from penta laboratories !

5930 is more likely.

An aviation rectifier, I had a number of them because on paper it was just the best my engineers could find and wanted to toy with it...Very expensive tube.

Cheers,