• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

(v?)Tailor PA-500 Tube Amp

Status
Not open for further replies.
I turned it on a few minutes ago ... with the expected fear that I might blow the whole block up .. and surprisingly, evertyhing lit up the way it was supposed to .. in the left channel al FOUR tubes lit up and started heating. In the right one ONLY ONE lit up .. but still .. it did. So what can I make of this? Can i presume that the trannies are allright? Or do I have to have somekind of load to test the output trannies? 🙂
 
I turned it on a few minutes ago ... with the expected fear that I might blow the whole block up .. and surprisingly, evertyhing lit up the way it was supposed to .. in the left channel al FOUR tubes lit up and started heating. In the right one ONLY ONE lit up .. but still .. it did. So what can I make of this? Can i presume that the trannies are allright? Or do I have to have somekind of load to test the output trannies? 🙂

At least you know the transformers are ok, but you should definitely put some sort of load on the outputs (speaker or dummy load) or you can damage the output transformer & the tubes.

@Telsla88: I think acarp's amp is the same as this one, even though only three tubes per side were shown, the bottom pictures showed 4 sockets, perhaps he took out some tubes?

Jaz
 
Last edited:
Important thing to note: You should have not plugged this thing in and powered it up, you're are very fortunate that the power supplies and apparently many other components did not fail as a result. All component values need to be checked, you need to verify that all coupling caps are OK, and the electrolytic caps in the supplies should probably be replaced.
 
Status
Not open for further replies.