I have a Trio KA-8700 japanese version of kenwood KA-801 in Europe /America. Curretnly i am trying to replace all electrolyte caps in all boards(Power amp except 4 10.000uF/63V i can not find, pre amp and tone control ). After replacing & re-assembly i powered it up in order to adjust dc offset, bias current etc. The amp relay clicks after 5-6 seconds but i see smokes from the transistor D313V/B507V (regulation of the pre-amp board) the heatsink is very hot so i turn off the amp and look carefully all caps in amp for correct value & direction, any short wires etc.... Powered again and smoke comes again. So i must shut off it immediately and now look for the reasons. I want to look at schematics/service of this amp but the service manual download from Hifiengine, Audiokarma... seem to be not fully or has very bad quality - unable to read for my repairing purposes. Has someone a schematics from this amp kenwood KA-801 i would like to thank in advance. Further i want to know also how can i substitute these D-313V-AL/B507V-Al if they are burnt? PS: By measuring: R77/R78: 47ohm, R79/801,3K, R81/82: 1,2K all is as stated in the service manual The power supply to the pre amp i get B +/_ appr. 58 V. is it normal or? My knowledges in electronics is limited please help me for easy understanding why these transistors get burning if anyone can and what i must check etc.- thank you!