The Universal Guitar Amplifier KEW/UA-92A seen in this page was my first attempt in building a cheap but good guitar amplifier for musicians or "poor" tube-loving enthusiasts. The amplifier consists of push-pull stages only, i.e "OP-input", with four EL34's in paralell Class A. LF output power is limited by the cheap obsolete OPT's saturation (115+115V@50Hz or some 10W@50Hz/5k) but may be as high as 20W@1kHz.

Main Data:
Power Consumption: 100W@230/115V 50-60Hz
Minimum Output Power: 2W@8R/20Hz (OPT saturation)
Maximum Output Power: 20W@8R/1kHz/10%THD
Mic Sensitivity: 15mV/47k
Open Loop Gain: 71dB/1kHz
Closed Loop Gain: 48dB/1kHz
External Speaker: 8R

KEW/UA-92A, My first guitar amplifier using four triode connected EL34's in paralell Class A.

More info:
Back
KEW/UA-92A, Circuit Diagram