Excellent working pair of MC 30's The power supply has been recently updated, and the signal caps are updated. NOS tubes, 100% working. One has the black and one has the dark blue chassis but are identical circuits. Some pitting but they are very presentable. Some rust spots on top of one transformer, but nothing too worrysome. All original as it should for that classic and vintage feel. The best sound from old McIntosh tube amps, RCA black plates 6L6GC, Telefunken 12AX7, Mullard 12AU7, RCA 12BH7, RCA black plates ST type rectifiers... The tubes themselves are worth over $500!!