AUDIO-2 Consideration of LCR PHONO EQUALIZER
How to determine the constants of a constant impedance LCR type phono equalizer (RIAA curve and other equalizing curves)...
AUDIO-2
AUDIO-2 
AUDIO-2 Repair of 15″ MAGNAVOX P232 field coil woofer
In middle of 2013, I got a pair of 15" Magnavox field type woofer units.No holes, no dents no signs of repair in cone an...
AUDIO-2 VT-25 Class A1 Single-ended Power Amplifier
I introduce my first amplifier that I made in year 1999..This amplifier is VT-25 Single-ended Class A1 stereo type.Recen...
AUDIO-2 6SN7 2 stages Amplification-2outputs Pre-Amplifier (External LC Channel Divider)
I introduce my own design Pre-Amplifier.Show full-circuit drawing belowThis Pre-Amplifier has following charactors and f...
AUDIO-2 Original design 2A3 Class A1 Single-ended Power Amplifier (All stages connected by transformers） for high frequency
Let me introduce my own design power amplifier（I made this in year 2003, modified in year 2011)I attach whole circuit dr...
AUDIO-2 Production of Bridge-T Attenuator (Extra Edition)
My preamplifier has two output circuit for low and high frequency.I needed to adjust signal level between high and low f...
AUDIO-2 Production of Bridge-T Attenuator (Completion）
I attach photos that attenuators are fixed on amplifierI made Attenuator for volume L/R individualy.This is side view.Mi...
AUDIO-2 Production of Bridge-T Attenuator
Last article, I introduced how to calculate resistor value for Bridge-T attenuator.To produce actual attenuator, must ch...
AUDIO-2 Design and Production of Bridge-T Attenuator (600 ohm) -1
I write article about Design and Production of Bridge-T attenuator (600 ohm)I made this attenuator in year 2006.Bridge-T...