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Bottlehead Kits => Legacy Kit Products => Tode => Topic started by: clthrt01 on September 30, 2015, 03:18:08 PM

Title: 1.6K Ohms resitor turned orange. [resolved]
Post by: clthrt01 on September 30, 2015, 03:18:08 PM
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
Title: Re: 1.6K Ohms resitor turned orange.
Post by: Doc B. on September 30, 2015, 04:41:03 PM
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.
Title: Re: 1.6K Ohms resitor turned orange.
Post by: Paul Birkeland on September 30, 2015, 04:45:16 PM
(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.
Title: Re: 1.6K Ohms resitor turned orange.
Post by: clthrt01 on September 30, 2015, 05:06:03 PM
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
Title: Re: 1.6K Ohms resitor turned orange.
Post by: Paul Birkeland on October 01, 2015, 06:29:18 AM
That short would certainly keep your amplifier from operating, but I don't believe it's the source of your trouble.

-PB
Title: Re: 1.6K Ohms resitor turned orange.
Post by: clthrt01 on October 01, 2015, 01:50:43 PM
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
Title: Re: 1.6K Ohms resitor turned orange.
Post by: clthrt01 on October 05, 2015, 05:33:57 PM
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.
Title: Re: 1.6K Ohms resitor turned orange.
Post by: Paul Birkeland on October 06, 2015, 06:30:43 AM

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!
Title: Re: 1.6K Ohms resitor turned orange. [resolved]
Post by: clthrt01 on October 06, 2015, 02:29:29 PM
Pretty sure my wife would kick me out if I did that.....