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In Reply to: RE: impedence of CCS mu output posted by Tre' on April 7, 2010 at 17:04:47:
From G. Pimms web page: "During prototyping I measured the output impedance of the MU output of the CCS on the 6ER5 triode at 2.5ma. The output Z is 450 ohms +/-20 ohms over the audio range."
From the data sheet the 6ER5 has a plate resistance of 8K running at 10ma (mu 80). But, of course, Rp is higher at lower current, how much, no curves I can find, show. I don't know the math to figure it out, especially without knowing the voltage at the plate. Where's the math?
The reason I'm asking is that a RIAA filter that follows, seemingly is based on this number, or perhaps is comfortably under a "number".
From my reading, there seems to be debate over whether or not driving a filter from anything less than maximum Rout(for the filter) is any advantage. I couldn't say with no experience. But assuming that less than or equal to is OK, then it seems one could drive a "proven" filter with any number of things if you knew how to calculate the Rout of a CCS mu stage.
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Follow Ups
- RE: impedence of CCS mu output - bobbyj 04/7/1018:24:37 04/7/10 (6)
- RE: impedence of CCS mu output - Tre' 18:57:48 04/7/10 (5)
- RE: impedence of CCS mu output - bobbyj 20:18:13 04/7/10 (3)
- RE: impedence of CCS mu output - Tre' 20:40:39 04/7/10 (2)
- RE: impedence of CCS mu output - bobbyj 10:15:02 04/8/10 (1)
- RE: impedence of CCS mu output - Tre' 10:20:13 04/8/10 (0)
- Here's a helpful calculator - Tre' 19:02:17 04/7/10 (0)
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