I have two Tweed Deluxes. One us a beat up original from the late 50s. It has original Tung Sol tubes in the power section. The preamp tubes have been replaced. Last week the original capacitors finally gave up the ghost and were replaced. The other is a Victoria. It has NOS GE tubes for the most part. A newer 12ax7 was put in after a preamp tube died. These Amps sound spectacular at rehearsal with my new Tele, a butterscotch 2018 MIM with Fender Noiseless pickups added by the seller. The cramping begins about 45 minutes into outdoor gigs with both amps. They lose volume and clarity, getting a brown sound that lacks definition. I started my outdoor Sunday gig with both amps singing: tone at 9 and volume at 3. I use a Reverb and Tremelo pedal along with a tuner. After about 45 minutes, both Amps lost their vitality. As far as I can tell, extension cables, the classic orange found in most garages, offer too much resistance and give voltage under 120, which seems to be the new standard. The other possibility is ? I tried my 19 year old Tech21 Trademark 60 at rehearsal last night and it sounded very nice. While it lacks the tube round, warm sound, it cut through without any hesitation. I was using my ‘65 Melody Maker with T Top PAFs I bought back in ‘72 when I was a junior in High School. I will plug in the Tele next time and see what I get. Thanks for reading.