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My guess is your not going to want to go very low on the capacitance. I would try the stock values first.
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One simple programm gives me for 40k transformer's impedance, and a corner near at 19hz, 220nf. 
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But you need to know what your transformer's impedance is at 19hz. Not likely 40K. :D
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avr300 wrote:Yes, identical to the once I have. I have a BS250P here, 100% identical to the ZVP2106A regarding the pin layout.
Anyway, I'm ordering a bunch of each, 250P and 2106A - and I'll see (or hear). I have removed buffer from my Legato I board and I feel I have lost some punch although it sounds smoother now... I'll try to convert may Legato I board with paralleled BS250. Did anyone tried to match those for this purpose?
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I have test both matched and unmatched sets. There is only very slight simulated benefit to matching in this case because of the parallel nature. I could not measure any difference, only simulate. I could not detect any audible change.
When I tested a bunch of BS250 from my bag, they were already fairly well matched in any case. The Ron of these devices makes them parallel very well.
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Russ White wrote:I have test both matched and unmatched sets. There is only very slight simulated benefit to matching in this case because of the parallel nature. I could not measure any difference, only simulate. I could not detect any audible change.
When I tested a bunch of BS250 from my bag, they were already fairly well matched in any case. The Ron of these devices makes them parallel very well. OK thanks! I just have read your announcement of legato rev. 3 arrrggghhhh  I wanted it no caps in the first place.... I guess I'm going to try it now with ground lifted because without buffer I have only ~6mV on one channel and 0mV on the other... btw.
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