index [turneraudio.com.au] prostate cancer, psa graph, power transformer for sale, output transformer for sale, tube, valve, amplifier, amp, australia, canberra, audio, repair, loudspeaker, preamp, output, transformer, calculations, design, theory, schematics, negative, feedback, triode, pentode, anode, cathode, grid, forsale, TURNER AUDIO. Hello everyone, from Patrick Turner. I retired from the audio business in 2012. I no longer manufacture audio amps or speakers or do any repair work. Last …