Maintenance cycle? Maybe you'd need to replace a tube now and then. There's only one tube in it and it could last for years. I wouldn't worry too much about it. Replacing a single tube costs about $15-20.What kind of maintenance cycles should be expected on something like the SVT 7 Pro? I guess I should have asked around about this first before trying to jump into a tube head.
I'm becoming more open to the idea of a Portaflex 350 or 500 head or even the 112 or 210 Rocket Bass combo. Just really tough since the only Ampeg amps that I can try in person is a 110 combo.