Recent content by luisbock

Just a correction grid leak resistor-output, cathode-input

I will try and increase the bias current to see what happens (are they now running at 50% of max dissipation rating?). I've added 2 more coupling capacitors (0.47 uF) and 2 more grid leak resistors (220k). So EL34's have their own interstage capacitor and independent bias regulation (i can send...

Pure Sound I have finally changed my AI 1000 mk III to active Bias,running the EL's 34 with 39 mA of bias. I had to duplicate the coupling capacitors to the EL's. For safety i added a fuse in the B+ to the output transformer (315 mA slow blow). Well i get a new sound, more clean and detailed...

Pure Sound Is it possible to fit an active bias module in the AI 1000 Mk III? does that resolve the known valve failure problems?