Need 5E3 Build Troubleshooting Help

paul-e-mann

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That sounds dead to me.

You should have about 380v DC at pin 8. If you only have 1v DC, that’s the problem. I would assume that a new tube would fix that.

So is there any indication that the rectifier heater momentarily gets hot?
It may be that the heater fails (goes open circuit) as soon as heats.
Maybe resoldering pins 2 and 8 would help :shrug:
Popped in a Sylvania 5Y3GT rectifier tube and the amp is alive! Cheap Chinese 5Z2P tube that only lasted a couple weeks or is there more for me to worry about?
 

william vogel

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Popped in a Sylvania 5Y3GT rectifier tube and the amp is alive! Cheap Chinese 5Z2P tube that only lasted a couple weeks or is there more for me to worry about?
Did you measure your voltage as the tubes transition from cold to warm.
 

paul-e-mann

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I just wanted to make sure the 5y3 quickly warming up didn’t send the voltage way above the capacitor ratings. I use a 6087 with an indirectly heated cathode and my HT voltage slowly rises.
Once I flip the switch on its a good 30 seconds before I get any sound.
 

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