javier pintos

A good friend of mine has a DSL100, last night while taking a break the amp was not put into stand by, sudenly there was a crakling sound (like the rice crispies with milk, sorry but i have no other way to describe it) and the amp output died, the valves/tubes do glow (all of them) but no sound is heard on any channel

Any ideas?

Adwex

First, check the fuses.
A tube may have gone bad, and caused the rice crispies, then took out the fuse.

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javier pintos

Provided that the fuse is ok and or gets replaced, how do we check if the tubes are ok?

javier pintos

Provided that the fuse is ok and or gets replaced, how do we check if the tubes are ok?


thanks

Adwex

Starting with the preamp tubes (with the amp OFF, and the tubes cold), replace one at a time, see if the problem goes away. If you don't have any spare tubes laying around, a cheaper, faster, easier way is to just move the preamp tubes around to different sockets. Since each tube has a different function, it's possible that a tube could be bad in one position and work fine in another position. But if you have no sound at all, I bet you blew the fuse.

Of course it's possible that a resisitor, or capacitor, or other component died, but the tubes are the easiest to check, and the most likely culprit. Hopefully the transformers are ok, they're expensive.

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