J uses a pair of p40 for about 10 years, most dynamic and powerful indestructible, this amp excellent dja gets even better as the hardware associated with radio France pro, it no harm competition without a large amount of hifi amplifiers best known, or ancient rcents. Its rarity makes it only because it is mconnu trs difficult to find a pair. The Systm DEnter in symtrique by transformers of, spcial Radio France, makes these amps even INTERESTED, however we must know a little to use them, no connection n ' is standard. Prcisons once localiss a pair damplis saf is worth almost nothing because often the person know what she possde (Seeing me the person believed to have sold my own power supply!) At the one hand knowing Poerson what she is asked a lot of money or simply keep them. I by my mtier costs a lot of tubes or transistors amps, I confess that p40 is my prfres. that's all that type of amp rare musical short, a great value that we must keep all costs