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Perrew,

I would take RL filtration ageist C filtration any time and under any circumstance. If you look at the circuit of 600R LCR classic Tango filter

 http://www.vinylsavor.de/lcreq.gif

…then you will see that the serial capacitance all the way out of signal path. BTW, twogoodears in his bog posted a picture of his new ???- LCR-437A phonostage that was built for him by German Thomas Mayer with looks like Dave Slagle's magnetics.

http://twogoodears.blogspot.com/2009/11/western-electric-437a.html (the images are clickable)

It shall be similar to my 7788-LCR-7721 phonostage. Interesting that it is not know how what Thomas Mayer use as input tube.  To have a phonostage with two stages only the stages have to be very high gain, low noise and the first stage shall be able to drive low impedance of the LCR network.  The 7788 shall be a good choice for Mayer’s phonostage but I do not know what he uses. Interesting that on the twogoodears’ pictures there are no plugged tubes in input stage. If Mayer uses 437A for input as well as the output (which is legitimate) then this phonostage will have just 35-40dB gain and will be good only for MM needles.

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