Hi on Höfi's 6BQ5 Tube Amp page

THE ~15 WATT PP CLASS A/B TUBE AMP

some more pictures

Technical datas :
Principle : no feedback class A/B push pull pentode power amp
Max music output power : expected ~ 15 watt on 8 Ohm
Frequency range : unknown yet
Phase shift : unknown yet
Distortion 1kHz / 1Watt : unknown yet
Intermodulation 1 kHz / 15 Watt : unknown yet
Inputsens. : ~ 700 mV
Inputimpedance : 100 K Ohm
Cathode resistor voltage : ~10 volt
Plate voltage : 330 volt
Bias current : ~40 mA

This amp is in prototype state as somw of the other amps on my pages, had some problems
with the R...... 6BQ5. 1 of them didn't run at all. The second died 5 minutes after first usage
(loosen screen grid) . Was it bad luck or the quality ? The only thing at the moment I sure
about; the driver and phase shifter stages the Telefunkens E88CC out of my treasure box
are working great probably i'll modify my tube preamp also sometimes but there's the story
with the filament. And i don't like to redesign the power supply maybe i connect left and right
channel filament in daisy chaine Adam Riese said a long time ago 2 * 6.3 volts =12.6 volts ;-)

For any ideas or questions send mail
Last modified 29.10.99 by Erich Hofer

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