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Craig Sawyers · 18th Jun 2019, 8:02 am

I've just run a passive RIAA through TINA, allowing 0.1% tolerance to perfect value resistors, and 1% to capacitors.

The maximum error, with all tolerances stacking up worst case, is +/-0.094dB.

Picking the nearest E192 value resistors in 0.1%, and two standard value caps in parallel for one of the caps (all 1%), gives +/-0.11dB worst case stack up, which is perfectly acceptible.

That is for the passive RIAA that I use, so series R of 22k, then 3.2k in series with 100n, then 33n//1n across that.

Craig

18th Jun 2019, 8:02 am	#45
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,998	Re: Valve preamp. I've just run a passive RIAA through TINA, allowing 0.1% tolerance to perfect value resistors, and 1% to capacitors. The maximum error, with all tolerances stacking up worst case, is +/-0.094dB. Picking the nearest E192 value resistors in 0.1%, and two standard value caps in parallel for one of the caps (all 1%), gives +/-0.11dB worst case stack up, which is perfectly acceptible. That is for the passive RIAA that I use, so series R of 22k, then 3.2k in series with 100n, then 33n//1n across that. Craig Attached Thumbnails