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Old 27th May 2021, 5:08 am   #18
Robert Gribnau
Pentode
 
Join Date: May 2017
Location: The Hague, The Netherlands
Posts: 231
Default Re: Advice on this linestage build

Hello Jez,

Quote:
Originally Posted by Jez1234 View Post
EF86 or better still EF184 in pentode form giving around x 400 gain followed by a cathode follower then wrap the feedback around the Baxandall network.
Could you give values for Vb, Ra, Rg2 and Rk to achieve a gain of 400 with an EF86 and an EF184?

Quote:
Originally Posted by Jez1234 View Post
FWIW after seeing reports of super linearity from EF86 when triode strapped I tried it....

It's not true! I tried several samples, tried different methods of triode strapping and experimented with load line etc and distortion was disappointing.
Can you share some of your test results with us? Did your results differ from the distortion figures in this datasheet (see page 3), and if so, in what way? https://frank.pocnet.net/sheets/030/e/EF86.pdf
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