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- Users: digger945
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RMAA Fuze vs Fuze>10uF Caps>Mini^3, is there something wrong here?
SomeThing is not right with the crosstalk numbers. Either your methodology is flawed, or there is a problem with your Mini3. I would inspect the soldering on the Mini3 with a loupe. High resistance at the phone jack or ground channel amp could elevate the crosstalk numbers.- digger945
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Hook up your voltmeter to the power and measure the voltage with the power supply connected to the amp, then slowly and carefully move your hand close to the mosfets and observe the voltage. DO NOT TOUCH ANY EXPOSED WIRES!!!- digger945
- Post #225
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Disconnect the power supply from the amp and measure the voltage at the power supply plug.- digger945
- Post #223
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
^Looking good there Pierre. The volume knob turned out looking pretty nice, I think. Did you get the high power supply voltage down, or is it still running about 68v or so? I would like to see about 12v to 13v across the heaters. I'm not sure how they will last with almost...- digger945
- Post #215
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
is your power supply rated for 110vac input or 220vac?- digger945
- Post #211
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
It would be easier if you did what Nikongod asks. Then post your findings.- digger945
- Post #193
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Measure resistance between RCA signal input jack(the center pin) and circuit ground.- digger945
- Post #190
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Check the resistance between the input RCA jacks and ground. 68v is a bit high for your power supply. Is it 48v dc or ac?- digger945
- Post #188
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Allow the tube heaters time to warm before taking measurements.- digger945
- Post #186
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Measure between the grid and cathode for voltage. Measure voltage between the gate and source on the mosfets.- digger945
- Post #185
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Your power supply is 48v?- digger945
- Post #181
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Check some voltages and compare the 2 channels. Power down and check the resistance from input RCA jacks to the grids, and to ground. Again, compare channels.- digger945
- Post #179
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Yep, wire according to the diagram you posted earlier, while looking at the bottom of the socket.- digger945
- Post #177
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Nikongod is right. The sockets should be wired looking at the bottom of the tube. They are backwards.- digger945
- Post #175
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Quote: You are not finished in this pic? It looks like nothing connected to pin 1(plate) and a wire going to pin 9(should not be a wire on pin 9) Up close pics would help.- digger945
- Post #172
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
how about pin 4 or 5 on the tubes. One should be about 12v and the other should be zero.- digger945
- Post #171
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Check some voltages. Start at the power inlet. Make sure the polarity is not reversed. My first guess would be cold solder joints.- digger945
- Post #169
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
If you are facing the part, the pins would be gate drain source, from left to right.- digger945
- Post #167
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
You double check the pinout on the mostest? The pinout on the devices does not match the pinout on your board.- digger945
- Post #165
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Some of the power supplies struggle a little to fire up a cold amp, so the power supply may cycle on and off a few times until the heaters get hot. It takes the heaters more than a few seconds to get hot enough to warm the cathode sufficiently to begin emitting electrons, completing the...- digger945
- Post #163
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
Anything around 24 gauge or bigger should work fine for the source and drain. Smaller stuff would be ok for the gate.- digger945
- Post #158
- Forum: DIY (Do-It-Yourself) Discussions
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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp
R3 and R9 will be soldered very close to the MOSFET gates? Looking good.- digger945
- Post #153
- Forum: DIY (Do-It-Yourself) Discussions
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Millett "Starving Student" hybrid amp
While the IRF510 output MOSFET here has internal protection devices built in, it could be possible for the drain to remain "hot" even if the device failed, and the entire circuit were inoperable. A problem with the power supply, be it a Cisco or alternate DIY variety, could pose lethal to even...- digger945
- Post #5,993
- Forum: DIY (Do-It-Yourself) Discussions
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The Stax thread (New)
Chinese Speaker Maker Edifier Purchases Famous Electrostatic Headphone Maker Stax- digger945
- Post #16,976
- Forum: High-end Audio Forum
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Millett "Starving Student" hybrid amp
Quote: It should be fixed, but likely not the problem. In post #5970, you have an attachment with some of your operating points. You show 46volts at the gate of Q2, but 15.4volts on the other side of R9? With a good mosfet, you should read the same voltage on both sides of R9. If...- digger945
- Post #5,977
- Forum: DIY (Do-It-Yourself) Discussions