| Electronics > Projects, Designs, and Technical Stuff |
| My Way Over-Engineered 8 Ohm Dummy Load! |
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| bdunham7:
You should never power up a transformer-output tube amplifier without a connected load at all. And as for measurements and adjustments, generally everything is done with a load connected. Your resistor bank should see regular use if that is what you are doing. |
| coppercone2:
its not overengineered at all. its unfinished metal grill, fuse, chassis, handle, thermostat wood is not even polished so dont start lol' the only over engineered part is the sticker on the heat sink |
| Smoky:
Up until now, I've been using a small Bose 101 speaker when taking measurements. I just measured the Bose speaker with my DMM and it reads 3.8 Ohms. From here on, I'll use the correct value of dummy load that matches the speaker terminals. I went ahead and ordered one of the Caddock MP9100 4 Ohm 100 Watt resistors to add the bottom of the heat sink to cover that value. I'll just measure one channel at a time with it. Heck, I'm thinking now, it might even be more wise since using the same dummy load would remove a variable and more accurately reveal any difference in the "gain" between two mono amps. |
| oPossum:
The two 8 ohm resistors you have can be connected in parallel for 4 ohms. |
| Smoky:
--- Quote from: oPossum on May 23, 2020, 04:17:33 am ---The two 8 ohm resistors you have can be connected in parallel for 4 ohms. --- End quote --- You guys are worth an absolute fortune ;D |
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