Tube line preamp only: 5V4 rectifier tube; audio circuit employs only one 5842 RF tube > Magnequest DS 050/600 output transformer, currently wired for 18 dB gain.
Generally tube preamps must be fully stable, then power up the amplifier (SS in this case), and conversely the amplifier should be fully discharged before turning off the preamp.
Does the rule still apply with an output transformer-coupled preamp? I have turned the amp on within a few seconds after the preamp; so far no noise.
Amp is a Pass designed dual mono mid-80s Adcom GFA-535 60W original, recently fully restored, stripped/refinished chassed and with several upgrades including a new after market PS board.
Generally tube preamps must be fully stable, then power up the amplifier (SS in this case), and conversely the amplifier should be fully discharged before turning off the preamp.
Does the rule still apply with an output transformer-coupled preamp? I have turned the amp on within a few seconds after the preamp; so far no noise.
Amp is a Pass designed dual mono mid-80s Adcom GFA-535 60W original, recently fully restored, stripped/refinished chassed and with several upgrades including a new after market PS board.
