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

Hey

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

Benny
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Old 3rd April 2008, 05:08 PM   #2
kevinkr is offline kevinkr  United States
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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.
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