6550 Push-pull Amplifier Schematic
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100 watt push-pull fixed bias amplifier
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Raphaelite EP65 6550 Push-Pull Tube Amp
6550 Double PP
Bewitch
PP2010 - Hi-End Push Pull Amplifier
6550/KT88/EL34 single ended amplifier
March 1990
A Single-Ended 6550 Amplifier | audioXpress
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