[thejazzageuk]

Finally got round to carrying out the HT test that Techman suggested- 'Switch off, replace rectifier and connect a speaker and power up via a 100 watt lamp in series with mains input, with a DVM set to highest DC voltage range (600 volts?) clipped between first smoother after the rectifier and chassis to monitor the HT. Leave to warm up until you see some HT.'
With the rectifier in place and the voltage monitored at point 'A', after approx 2 secs from switch on, the test lamp begins to brighten and the voltage starts to rise. After about 5 secs, the voltage rises to around 160V and the lamp becomes bright (about half full brightness?). After 5 secs I switched off. I repeated this around 10 times without leaving power on for more than about 5 secs.