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In Reply to: RE: Trusty McShaned Eico HF87 posted by elflow on August 15, 2016 at 17:12:34
like what's in the Mac Mc240 and the Citation 2.Now I had a 50 ohm choke in there at 1hy.I took it out and put in a .5hy at 30 ohms..The B+ went up 2.3 volts.having a choke there really improves backgrounds,clarity,and overall control of the amplifier.I'm going to use the HF89 bias scheme and the reason I like the older bias schemes where they use a balance and bias pot,it is so much easier to bias because you aren't chasing the bias so much.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
What is the current capacity of the choke you used? I have never measured the voltage drop across the 50 ohms to see how much current is flowing.
300ma on the .5hy at 30ohms and the 50ohm choke was 1hy at 240ma.Those low Mu and low DCR chokes have a an effect on low level resolution that can't be denied IMHO.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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