維修forte audio後級

billymud · 發表於 2014-5-16 03:32

本帖最後由 billymud 於 2014-5-16 07:19 編輯

pinkspider 發表於 2014-5-14 11:00
最後發現係乜引致大細聲呢??

i guess:
forte audio Class-A power amp...model 1a ?
, 每邊五對功率管 ...2SA1302/2SC3281 ?
power-on, 一邊大聲一邊細聲, check the current on both channels...differences ?
at細聲邊, sense the body temperature on each 功率管, ...cool/hot ?
check the bias across the emitter resistors...open circuit ?
damaged resistors found ?

係 non-biased 功率管 (ie. not class-A working) 引致大細聲 !

zoneaudio · 發表於 2014-5-17 21:05

billymud 發表於 2014-5-16 03:32
i guess:
forte audio Class-A power amp...model 1a ?
, 每邊五對功率管 ...2SA1302/2SC3281 ?

billy sir
是model 3,不過開一陣就好鬼熱@_@

billymud · 發表於 2014-5-18 01:53

zoneaudio 發表於 2014-5-17 21:05
billy sir
是model 3,不過開一陣就好鬼熱@_@

一陣就好鬼熱@_@.....

listening · 發表於 2014-5-25 09:55

Zoneaudio兄想你幫幫手請收pm

[後級] 維修forte audio後級