K
Kelly
Well-known member
The change was around 1995. The original UL had 2 pi tubes. Around '95 they changed to 1 pi tube for a year. The next year they went back to 2 pi tubes, and the design stayed the same until now.That's another thing to look out for with VHT in general. Especially the Ultra Lead. At some point, I think early 2000s maybe they made a big design change with the phase inverter.
The pre change Ultraleads are not as aggressive. I had one and my 100CL blew it out of the water. I'd say be sure the PI is an ax7 and not an au7 if you get a UL (the older models also had a kt88/6l6 switch on the back)