SP-10 膽前級問題 - 突然無電

在hifi fever 幾年前買了套件　＋　機箱, 音色很好, 一切正常 .    到最近一個月開始逢開機 3- 4 分鐘播放都正常，之後就突然？無電, volume fade out, 電源燈熄滅, 過了不久再開機, 亦是播3-4 分鐘斷電.    已 check 了 膽, 所有正常.  

可否告知有甚麼可能性? 謝謝

After testing again, the A tube is still with electric current (bulb is light up) when the amp is "off" (with power switch on) after playing a few songs.
while B , the signal light for power is off when the amp is "off" (with power switch on) at the same time
the another circuit board connecting the main power supply is totally no current (as see from the other 4 6922 tubes, no light up)

I wonder - would it be the capacitor ? i dun know which one, is defective / blow off, so at the start the amp can still play but after a few songs it would die down.

Any ideas?

KK, modi 可以幫幫手嗎?

回復 3# admin


    KK has sent me message for help, but need to check after CNY, I just 無聊 and see if anyone can diagnose my tubeamp sickness through these limited info.
Thanks admin