Tube DIY Asylum: Re: Latest version of my 7788/7721 LCR 600Ohm RIAA Stage by Thorsten Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Thorsten (M ) on October 3, 2005 at 13:37:11

In Reply to: Re: Latest version of my 7788/7721 LCR 600Ohm RIAA Stage posted by BBeck on October 3, 2005 at 13:10:57:

Hi,

> How to measure? Easy. Disconnect any input transformer
> or cartridge. Measure the voltage across the 47K input
> resistor, divide by 47K and that's your input grid current.

Too much hassle, I have around 700 Ohm DCR in the gridcircuit (transfomer & gridstopper) and the grid is well below 1mV and thus below 1uA.

It does not worry me. I was worrid it may lead to too much non-linearity but 'scope & fft are clean enough, sounds great too.

Decent phonostages are wasted on MM Pickups anyway. No point sinking nearly $ 1,000 in parts into a Phonostage and the using it with a V-15 or the like.

Ciao T

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