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EC86 and phono
EC86 and phono
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Old 3rd April 2008, 08:42 AM   #1
Hojvaelde is offline Hojvaelde  Denmark
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Default EC86 and phono


I have some EC86 tubes, I want to use in a phono amplifier.
But I can't find any schematics for phono using EC86

Even Google can't help

Can anybody help me

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Old 3rd April 2008, 05:08 PM   #2
kevinkr is offline kevinkr  United States
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EC86 and phono
You'll have to design from scratch, but based on the Philips specs this looks like a very promising tube. A lot of the information you will need is in the earlier Philips (1947 spec sheet).

The recommended conditions are Ip12mA, Vp 175V, RL 5.6K (I might be inclined to go a bit higher, say 10K. ), Vg -1.5V.. With some tweaking circuits designed around triode connected D3A will work.. Note that the EC86/6CM4 is typically about 3dB noisier than trioded connected D3A which is insanely quiet. (I use them.) Should still be far quieter than the noise resistance present in most moving magnet phono cartridges.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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