This Sontec 250C sounds incredible on any source you run through it. Extremely musical and transparent

It has 2 nickel core cinemag transformers to balance the output for a pin 2 positive output. (These units shipped with a pin 3 positive unbalanced output.)

The unit had all electrolytic caps replaced ~3 years ago and checked out by a local nashville tech.

Cosmetically, the clear coat flaked off the front panel prior to my ownership bit it doesn’t effect the function of this unit at all.

From Vintage kings website:

Fully sweepable low, mid, and high bands plus switchable shelves at the top and bottom, the 250C is known for its musical response, subtle coloration, and surgical precision. 

Frequencies

• Lo Shelf: 15 - 800 Hz
• Lo: 15 - 620 Hz
• Mid: 120 Hz - 8.2 kHz
• Hi: 400 Hz - 26 kHz
• Hi Shelf: 1.2kHz - 32 kHz
• Level: +/- 12db, with '0' position detent on each band