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Need help with P2P Starving Student...

post #1 of 4
12/23/09 at 1:51am
Thread Starter 
I just finished soldering a starving student and everything looked good, but when I flipped the switch on with no tubes in the mosfets didn't heat up. I thought that maybe it was because I didn't have the tubes in, so I put them in and turned it on, but then the left one flashed a bright orange and I immediately turned off the amp. I've checked all my connections and they seem to be going to the right places. However, I didn't get to check the voltages because in the process of learning how to use my multimeter as a voltmeter, I blew its fuse...

Anyway, do you guys have any idea on where to start troubleshooting?

Thanks,
~getllamasfast

EDIT:
I figured out that the flash was the tube heating up, but only one tube heats up. I let it sit for a while and hope that I could at least get one side working, but then the bottom heaters started flashing and then the power leds started flashing. Now neither tube heats up, nor do the mosfets and the leds blink if the tubes are plugged in. If I leave the tubes out, the leds are fine...
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post #2 of 4
12/23/09 at 3:43am
i'd say go get a fuse... also, pictures help.
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post #3 of 4
12/23/09 at 4:42am
Yes. Nullstring is absolutely correct. Get a fuse for that DMM and please get us some pics.

About the tubes and MOSFETs - the tube heaters are used to bias the MOSFETs, so they won't be "On" unless the tubes are in. However, it sure sounds like you have a short/crossed wires somewhere.

By the way, pics posted in the Starving Student thread will mean that a lot of people will look at it who are familiar with troubleshooting a Starving Student. That increases the odds of someone spotting the trouble. Actually - it's a misconception to think you'll get more attention by posting a separate thread. A new thread, not being specifically followed by the SSMH crowd, will tend to fall off the first page quicker and is more likely to disappear forever. Just a thought ...
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post #4 of 4
12/23/09 at 5:09am
Thread Starter 
Thanks for the heads up tomb, I'll make a post with pictures and a video in the official thread.
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