New 65 Amp for my birthday...a head that I play through either an old, smooth tolex Vox 2X12 with orig. cone Blues or an Avatar 2X12 with open back port and Red Fangs. Liking the Avatar better with 65! Stock tubes sounded very good...a little buzzines when pushed hard...NOS Mullards EL84s and 12AX& with a Brimar CV4004 and a Philips made in UK (Mullard) in P/I...clearer, less chimey, more sustain and smoother breakup...gotta love the click channel...AC 30 on steroids!!!! Now, switched out stock power cord...kinda thin and wimpy piece of cable...used a Marigo cable with heavy duty connectors and solid core wire with damping and shielding...same cable reccommended by all tube stereo preamp to the stars...$8K for a volume control, a switch and some gain...preamp maker says cord gets cleanest, 3d images, sweeter highs and more controlled lows... Like adding 15-20% more of everything...low end more powerful and less loose, mids more prominent, highs clearer and louder but less grain...at lower, clean volume level you can hear more string to string definition...more of the guitar's acoustic sound...more wood...played my 1959 ES335 and 1957 Strat and heard more of what I paid for...very similar results with this power cord and Komet 60 #8...I guessing that the power cord impacts the power supply of the amp in a way that makes it deliver cleaner power...its not subtle!!!