22-05-2013, 09:06 PM
Today I tested the amplifier, using my bench PSU, which has a maximum o/p of 25 volts.(single rail) What I found, measuring the DC voltages with respect to ground was that they were - 17 & +8v approximately, which leads me to suspect one or more of the o/p transistors. The test, incidentally, was carried out with the two 4A fuses in series with the AC side of the rectifier diodes removed, though this may not have been strictly necessary! Just to correct an error in my previous post - the Ground side of R267/c210 is common with the '0V' line(well it was late and I'm typing this at home, whilst the amplifier is in my workshop some 3/4 mile away!!!)
