The Playmaster is an Australian twin channel guitar amplifier from the sixties - these came in kits, with instructions published in a magazine. It's an usual design if you're used to looking at Fenders and Marshalls etc.
Channel one: The main guitar channel has volume, bass, treble, vibrato speed and depth and has 12" speaker. The 12" speaker directly drives the reverb tank - more on that below. This channel on its own is similar to the Playmaster 102 guitar amplifier.
Channel two: Channel two is an entirely separate amplifier, with its own 10" speaker. Controls are volume and tone. The reverb tank can be plugged in via a jack, or it can be used a separate channel for a microphone or record player (the old high-output type).
So there are two completely independent 12w channels. Each channel has an identical output transformer, phase inverter and power amp. The power amp stages / transformers are both ultra-linear, which is a little usual in itself. The preamps also vary to account for different uses.
Valves: 6GW8 pentode / triodes. 7199 triode / pentode for preamps and a 6BE6.
PLAYMASTER 103 GUITAR AMPLIFIER
FERGUSON OPM7A OUTPUT TRANSFORMER SPEC
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