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PL504 Pentodo de Saída de Linha (IP981)
PL504 @ The Valve Museum
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Low Voltage (60V) Stereo Tube Amplifier for Dummies (2+2W) | Page 7 | diyAudio
I stumbled across this searching for a suitable preamp/driver stage for a pl36 se amp but the cathode follower confuses me... Details in the comments. : r/diytubes