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69.71.1.1
In Reply to: RE: 6BK7B cathode follower questions posted by Caucasian Blackplate on April 02, 2015 at 11:23:29
The input jack goes to a 100K pot then to a 12ax7a diff amp. So 100K-1M, Jim
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
Follow Ups:
Miller capacitance on a 12AX7 is pretty high, and will need to be driven from a relatively beefy preamp for good bandwidth.
Still, check out the Jensen paper on getting a balanced out without a transformer. Do you need any gain in this preamp? Or are you just buffering?
Thanks! I don't like to use opamps with the + input grounded and unity gain. This is the worse case operating condition of any amplifier. A good transformer is better IMHO. Do you have a link of the Jensen article? Jim
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
The op-amp case has nothing to do with a cathode follower. You are using a cathode follower anyway, I don't see how this has anything to do with what you're up to.
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