Tube DIY Asylum

RE: Buffer Circuit for Passive Preamp - Questions

67.164.79.218

In Reply to: RE: Buffer Circuit for Passive Preamp - Questions posted by Mike C on May 10, 2008 at 02:24:33

I would go for either an E810F or D3A, they have much higher transconductance than the E180F, and transconductance is a very important part of a CF. I would run them at least 10mA maybe up to 20mA.

I personally would go with a real CCS as the load, as many know I'm personally very fond if the Gary Pimm MOSFET based CCS, but a simple pentode CCS would work very well here as well. Just use another one of your CF tubes as the CCS.

I would also go for the bipolar supply and direct connect the input. An interesting alternative is cap couple the input and DC couple the output, but that gets more complicated.

John S.

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