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-   -   EF86 tube preamp (http://www.diyaudio.com/forums/tubes-valves/161047-ef86-tube-preamp.html)

gaborbela 10th February 2010 05:41 PM

EF86 tube preamp
 
1 Attachment(s)
Hello
I would like to use these tube preamplifier to drive my Krell KSA-50 Clone .
Only problem the preamp has to much gain .
The recommended output load 200K or more !
It is possible to somehow lower the gain so I can use it .
Any advise welcome .
I love the EF86 tube sound . These is a simple , very nice tube preamp .

Thanks
Greets

Eli Duttman 10th February 2010 06:04 PM

DC couple a ZVN0545A source follower to the EF86's plate. Cap. couple the source follower to a step down trafo. Sowter's model 9042 might be suitable.

Tyimo 10th February 2010 07:00 PM

Leave out the cathode bypass electrolitic cap and you will have much less gain, but still to high output impedance.....:D
Greets:
Tyimo


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