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Frank's EC8010/6C45P-GM70 SE Interstage.
Frank's EC8010/6C45P-GM70 SE Interstage.
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Old 14th December 2010, 12:21 AM   #1
Zekk is offline Zekk  Singapore
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Join Date: Mar 2009
Default Frank's EC8010/6C45P-GM70 SE Interstage.

Hi Folks,

After month's of scudding thru the various Forums, I was delighted to come across Frank's EC8010/6C45P-GM70 SE Interstage
schematics posted in Nov.2002.

Why Frank's ?
Well ... not too complicated 2 stages design and above all, one of the few guys out there whose schematic I can safely rely on.

Anyone built it?
Care to share your experience and insight !?

[B]6C33C and GM-70

With Regards,

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Old 14th December 2010, 12:52 AM   #2
quikie22 is offline quikie22  Malaysia
diyAudio Member
Join Date: Sep 2009
1. Do note that you will be using voltages above 1.2kV (translated as DANGEROUS to a newbie)
2. You will need a good interstage transformer (translated as EXPENSIVE)
3. You will need very high voltage output transformers (translated as SUPER EXPENSIVE).

But no one is going to stop you from trying. Just be extremely careful and know what you are getting yourself into.

Last edited by quikie22; 14th December 2010 at 12:59 AM.
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Old 14th December 2010, 08:16 AM   #3
Vinylsavor is offline Vinylsavor  Germany
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Join Date: Feb 2002
Location: Lindau

EC8010 or this Russkie are no good choices as drivers for a transmitting tube output stage. Way too little headroom. Non linearities due to grid current will kick in around -0,7V at the EC8010. This is one of those designs where you will have significant changes in sound by small changes of op point, especially in the driver.

Sometimes simple can be too simple.

Best regards

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