The other thing is,
Oh listen I can hear the music coming from the valves with no speaker connected
Then whats that whistle
Output Tx Poof
NB always use a dummy load or have speakers connected never run with nothing connected to the speaker terminals.
Regards
M. Gregg
Price of an education.
Actually, never connect speakers to a new amp, only a dummy load. Nothing like frying expensive drivers because amp oscillates. Another cost of learning.