EC86 and phono

[Hojvaelde]

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

 

[kevinkr]

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.

 

[arensattic]

Dear Benny,

Your post is already more than 10 years old, so this response may be useless.... However, I have discovered a few interesting designs for an EC86-based phono preamplifier on a Thai website, called www.diyaudiovillage.net - Index. If you are still interested, I can send you my downloaded documents. You can of course also visit the Thai site (it has many interesting schematics, but unfortunately, attachments of old postings on this site tend to disappear).

Best regards,

Aren

 

[PhilippS]

The FAT phono preamp is quite famous in DIY Germany, it uses PC86 as input tube. Like some other frame grid UHF tubes E/PC86 is very suitable for this application.

 

[Kay Pirinha]

Agreed. Somewhere in this forum there's a thread about a phono preamplifier project that uses PC93's or PC900's in the first stage. Maybe you'll find suitable hints there.
Best regards!