Recent Posts

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by AlNewman on January 23, 2026, 09:04:07 pm »

Sounds like a good time to build a light bulb limiter.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by apeontheweb on January 23, 2026, 08:45:25 pm »

Yeah the resistor is a bit bulkier than the others.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by JPK on January 23, 2026, 08:33:51 pm »

Was it 2 watt? It should look like it. Much bigger. If not look at the tube socket wiring. Make sure it's all correct.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by apeontheweb on January 23, 2026, 08:30:22 pm »

Yes it is a 4.7K not a 47K. I also verified with my multi meter. I apologize for my lousy communication when I accidentally said a 47K resistor.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 build troubleshooting

« Last post by JPK on January 23, 2026, 08:18:05 pm »

Seems like the electrolytic caps are correct polarity. No idea why it would blow. You'd think the PT primary fuse would have blown. Just happened on my recent build of a different amp. I left a rectifier diode lead long while populating the board and forgot to clip it off before I mounted the board. Diode lead shorted the HT directly to the metal standoff/ground and blew the primary fuse. So thankful my PT didn't fry. That was a silly mistake.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by JPK on January 23, 2026, 08:09:53 pm »

Should say 4k7. Not 47k. Should read close to 4.7k. If they actually supplied a 47k that's not gonna work. The other one needs to be around 22k. Both 2 watt as my layout shows.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by stratomaster on January 23, 2026, 07:41:02 pm »

Something at that node is drawing enough current to kill that resistor.  I'd be inclined to think it's the filter cap for that node, but it could be anything there.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by SEL49 on January 23, 2026, 07:17:03 pm »

The little bag the resistor came in said "2 Watt 47K" and I measured it and it was 47K. I don't know maybe it wasn't a 2 Watt but how would I know? The resistor still reads 47K. What voltage drop might i expect to see over it?

Should be 4.7K, not 47K.

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Tube Amp Building - Tweaks - Repairs / Re: 5E3 Build Smoke Comes out of Resistor

« Last post by apeontheweb on January 23, 2026, 07:13:10 pm »

The little bag the resistor came in said "2 Watt 47K" and I measured it and it was 47K. I don't know maybe it wasn't a 2 Watt but how would I know? The resistor still reads 47K. What voltage drop might i expect to see over it?

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Other Topics / Re: Anybody watching Gold?

« Last post by mresistor on January 23, 2026, 05:04:29 pm »

How high do you guys think Silver is going to go? I heard something about London doing something with Silver to raise the price.. but don't know what that is all about. Saw this
https://www.moneymetals.com/news/2026/01/22/silver-squeeze-or-supply-chain-chaos-stefan-gleason-explains-the-rally-004634