Hola mi amigos, I powered up my build for the first time yesterday only to discover that for some reason all of my HT voltages were sitting at B+; the dropping resistors weren't dropping.
6550 plate: 460
6550 screen: 460
12ay7 plate: 460
12ax7 plate: 455
12ax7 plate: 455
There's a 5.6k 10 watt resistor that should be dropping the screen and 12ay7 to about 310, and a 10k 2 watt that should be dropping the 12ax7 voltages. Its as if the tubes aren't drawing current at all. There's a 12au7 for a reverb driver that hasn't been put in yet so I expected them to be sitting a little high but this is clearly a bigger problem. Any hints?
I wired an ammeter between the power primaries and switch, it says its only drawing .6 amps. The 6550 heaters alone should be pulling more than that. Anyone have a helpful hint on where to start?
6550 plate: 460
6550 screen: 460
12ay7 plate: 460
12ax7 plate: 455
12ax7 plate: 455
There's a 5.6k 10 watt resistor that should be dropping the screen and 12ay7 to about 310, and a 10k 2 watt that should be dropping the 12ax7 voltages. Its as if the tubes aren't drawing current at all. There's a 12au7 for a reverb driver that hasn't been put in yet so I expected them to be sitting a little high but this is clearly a bigger problem. Any hints?
I wired an ammeter between the power primaries and switch, it says its only drawing .6 amps. The 6550 heaters alone should be pulling more than that. Anyone have a helpful hint on where to start?
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