I have kitted up Matched IRFP240 & IRFP9240 MOSFETS for your Ampeg SVT 4 Pro Bass amp project / repair.

This set is exactly what is needed if you're repairing the power amp section of a Ampeg SVT 4 Pro.

5 pcs Precision 0.1% Matched IRFP240 MOSFETs

5 pcs Precision 0.1% Matched IRFP9240 MOSFETs

MOSFETs are manufactured by Vishay, IR, and/or Fairchild. 

MOSFET Vgs is measured at 170mA in a steady temperature room and with a timer circuit for consistent and precise matching.

Each set is matched within +/- 5mV (0.1%). Often even closer.

See other listings or inquire for other quantities. Pairs, Triples, Quads, Sextets, Octets, etc.