Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Tode => Topic started by: clthrt01 on September 30, 2015, 03:18:08 PM
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Hello,
I finished my Tode last week. Everything seemed to check out okay with the multi-meter (some output readings were low, but from some reading, that was to be expected). I plugged it in, got about 2 notes out and it fizzled out. Sounded like something fried inside. A few seconds later I saw smoke. The 1.6K Ohm resistor was orange-hot and, after it cooled, crumbled. I replaced it, only to find the same problem. Any idea what causes this?
FYSA, I'm new to this stuff.....this is my first build of this type.
Thanks
Mike
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Don't turn it back on, you have a major short somewhere. The burned resistor is a symptom, but not the problem. Best place to start is to go back over all your connections to make sure you haven't inadvertently wired something to ground that shouldn't be.
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(some output readings were low, but from some reading, that was to be expected).
Which ones?
A backwards capacitor would cause this problem on its own.
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At this point, I don't quite remember which ones. I would have to go and redo them, which I can do tomorrow.
I think I might have found the short. The shielded wire that jumps from A4 & 5 to B4 & 5 was fused together about a 1/4 inch above B4 & 5. While soldering, apparently I let it get too hot and it melted the coating and the wires were touching. Will this cause my problem, and now that they are separated, can I chance turning it on again?
Thanks
Mike
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That short would certainly keep your amplifier from operating, but I don't believe it's the source of your trouble.
-PB
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Nope, it wasn't. I also found that I had the poly cap attached to 18U instead of 19U......but that didn't solve it either. I need to go through the directions step by step because I cannot find anything else that looks odd. I must have attached something wrong.
Mike
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Turned out to be a really simple issue. Terminal 5 on the output transformer was touching the metal speaker frame. I bent the tab in, away from the speaker and viola.
Thanks, pretty cool little amp that I now want to build a cab for so I can hear it through a 12" speaker.
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Thanks, pretty cool little amp that I now want to build a cab for so I can hear it through a 12" speaker.
I'm glad you got it sorted! Don't limit yourself to one 12" speaker, go for a 4x12!
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Pretty sure my wife would kick me out if I did that.....