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20th October 2005, 07:52 AM
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diyAudio Member
Join Date: Dec 2004
Location: UK
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Pioneer SA-9800 Power Supply
Hi I wonder is anyone can help? I have the service manual for the US versions (110, 120, 220, 240 Volt) of the said amp, on the power supply board there are 2 ofTO-220 (on U shaped heat sinks) type transistors supplying the 30 Volt + & - rails they do run OK, but has anyone noticed how hot these transistors run, all currents etc are as stated in the manual. I also noticed the UK model e.g. the 220 ~240 model has 4 of these transistors (on 4 U shaped heat sinks) on the same board, these run a lot cooler, has anyone got the UK service manual if so would it be possible to email me that part of the manual to see what the actual circuit looks like, it would be very much appreciated.
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