I have up for grabs a MINT Thunderfunk 550A in 420 clothing. It's a newer model and actually a 550 in disguise, built by Dave before the original 550 chassis were available. Does 550W @ 4 ohms, has the switch, rack ears included. Serial Number is: TFB-509. This was the last 550A to be built in the 420 chassis and only 9 were made like this... Tone doesn't get any better than this!
"The Switch" came about in September, 2003 when I spent some soundcheck time with LeAnn Rimes' bassist,
Victor, and brought two Thunderfunk amps with me. We AB'd these two amps along with his EBS system.
I had made a change to my design that I wanted to test, and the result was that the amp sounded more like the EBS...
more "HiFi" and to my ears more "sterile." I decided I liked my original tone better, but then I thought,
"Why not just put in a switch?"
"The Switch" changes between the original High Voltage power supply that feeds the power amp,
and a separate Low Voltage power supply that gives a more hifi tone. It is subtle. It's not some dramatic tone shaping circuit.
It's a change in response and texture. The more sensitive your touch, and the louder you're playing
(as the effect is more pronounced when the High Voltage power supply is sagging more). the more you'll hear the difference.
It's NOT a two channel amp. It's NOT intended to be changed mid-song as it's not silent.
It's just another option to setup the amp for use with different instruments and styles.
The Switch is not a tone shifter. In the "tube" position there's more upper mid-range honk." Dave Funk.
SOLD!!
