KR Audio Marconi R valve amp?

kenneth · 18th August 2012, 09:05 PM

Has anyone any suggestions (schematics) on how to build a amp with my newly bought KR Audio Marconi "R" valves. I have a pair of single ended output trans (primary 5kohm). I would prefer something without interstage transformers as i would like to keep the cost down. R valves specifications: Max plate voltage 180v, Max current 2ma(vf:4v,vg:0v), Va 120v, Ia 1ma, Vg -0.5v, Transdoctance 0,3ma/v.

Thanks,

Kenneth

kevinkr · 19th August 2012, 12:35 AM

These might be applicable in a simple line stage with an additional stage for buffering but they have insufficient transconductance, mu, and current handling for practical use in a two stage power amplifier.

kenneth · 19th August 2012, 07:46 AM

I bought these tubes mainly for display use, but it would be interesting to build a amp with them. A linestage using these tubes would also be fine. I am aware of the limitations of these tubes and dont expect hifi sound from them. I have ECC81,82,83,85, 5687, 6922, 6072a, 6sn7 tubes maybe suitable for a linestage with the Marconi tubes?
Thanks!

18th August 2012, 09:05 PM	#1
kenneth diyAudio Member Join Date: Mar 2006 Location: jämtland	KR Audio Marconi R valve amp? Has anyone any suggestions (schematics) on how to build a amp with my newly bought KR Audio Marconi "R" valves. I have a pair of single ended output trans (primary 5kohm). I would prefer something without interstage transformers as i would like to keep the cost down. R valves specifications: Max plate voltage 180v, Max current 2ma(vf:4v,vg:0v), Va 120v, Ia 1ma, Vg -0.5v, Transdoctance 0,3ma/v. Thanks, Kenneth

19th August 2012, 12:35 AM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	These might be applicable in a simple line stage with an additional stage for buffering but they have insufficient transconductance, mu, and current handling for practical use in a two stage power amplifier. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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19th August 2012, 07:46 AM	#3
kenneth diyAudio Member Join Date: Mar 2006 Location: jämtland	I bought these tubes mainly for display use, but it would be interesting to build a amp with them. A linestage using these tubes would also be fine. I am aware of the limitations of these tubes and dont expect hifi sound from them. I have ECC81,82,83,85, 5687, 6922, 6072a, 6sn7 tubes maybe suitable for a linestage with the Marconi tubes? Thanks!