Tube RIAA for high-output mc

[markuskantola]

RIAA without cover ... and measured frequencyresponse.
All testing was done cover on .. it makes great difference on these signal-levels.

 

[N101N]

This is something horrible. Lord, have mercy...

 

[markuskantola]

Main features

-KISS topology
-100-240 V AC supply voltage
-Heater soft start 10 sec
-Outputs shorted 45sec while tubes warm up and ... if supply suddenly drops
-Output-voltage limiter about 10Vrms to protect sensitive poweramp inputs
-Max gain 1140 at 1kHz after latest mods ... (was 1250 earlier) .. adjustable
-Phase is accurate ... +0.0 ... -3.3 degrees 20Hz to 20k
-Frequency response +-0.1dB 20Hz to 20k vs RIAA
-Measures good values and sounds excellent