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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: How to design a passive single-network RIAA (two tubes) posted by Kurt Strain on March 24, 2002 at 20:40:10:
Thanks, Kurt. This is neat. Lots of practical design information. One thing that I didn't find in your approach though, is the effect of Ip on rp. Tube parameters are measured at a specific, usually high, Ip, 12ma in the case of the 6922. According to RDH4, p.493, gm and rp vary dramatically with operating point. The actual rp = published rp times the cube root of published Ip over operating Ip. As an example, if the 6922 in this circuit runs at 2.5ma, then rp rises from 2.9k to 4.9k, nearly double. This will have a big effect on R1, particularly if you're trying to keep it on the low side. Hope I haven't missed something.
Fred
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Follow Ups
- Re: How to design a passive single-network RIAA (two tubes) - Fred Humphrey 03/26/0209:02:12 03/26/02 (1)
- Re: How to design a passive single-network RIAA (two tubes) - Kurt Strain 09:44:11 03/26/02 (0)
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