tube amplifier music angel xd 845 lighting problem

hoikungman

dear ching,

i have recently bought a 2nd hand music angel 2 large tube 4 small tube amplifier
when i turn it on, only the 2 tube on the back lights up but no the fron 4 small tube
is it normal?
or is it all tubes will be lighten up?

thanks

kl122002

2支大, 4支細?
甘又有無聲出?  因為後面大的功率管,  前面的可以係訊號管,  或者當中有一支係整流管 加三支訊號管 .

訊號管的發熱絲細, 但細心D睇應可以望到入面紅左表示有著.
而不同的細管各有不同腳做供電和輸出位置, 基本上是不可以亂插.

hoikungman

thanks ching, very useful, i found the 4 small tube actually lights up