> bought cheap on AliExpress, who would have thought
But they are refurbished, meaning removed from used equipement and have new legs crimped on.
Not new.
> I made some traces of those LU1014D,
> do you have traced yours ?
I have traced > 500 pcs, in a triode cell.
Some other Source Follower Configurations
Patrick
But they are refurbished, meaning removed from used equipement and have new legs crimped on.
Not new.
> I made some traces of those LU1014D,
> do you have traced yours ?
I have traced > 500 pcs, in a triode cell.
Some other Source Follower Configurations
Patrick
Thanks,
At least with refurbished you can work, especially now that the new ones are sold out,
with fake it's the trashcan.
At least with refurbished you can work, especially now that the new ones are sold out,
with fake it's the trashcan.
Hey ZM, I noticed you've switched to the Edcor PC600-600. Is zobel network not needed with this one? I don't see that on the schematic any longer.
The mouse that roared?
Can the LU1014D become the mouse that roared?
Yesterday I received 50 each LU1014D from the EBay source recommended by woofertester. They look like the real thing: factory style packaging and no indications of any previous use.
I did a line-up of 6 different transistor packages. Amazing difference in package size and heatsink contact area.
I plan to experiment with several heasink options and stress test the LU1014D up to about 10-20 watts.
Can the LU1014D become the mouse that roared?
Yesterday I received 50 each LU1014D from the EBay source recommended by woofertester. They look like the real thing: factory style packaging and no indications of any previous use.
I did a line-up of 6 different transistor packages. Amazing difference in package size and heatsink contact area.
I plan to experiment with several heasink options and stress test the LU1014D up to about 10-20 watts.
Attachments
LU1014 junction to case is 0.5W/°C.
20 watt gives you dT of 40°C.
Assume heatsink temperature of 55°C (due to the cascode MOSFET), junction temperature will be 95°C.
In comparison, 32W for IRFP240 gives 82°C junction for 55°C sink.
I hope you have real good speaker protection circuit. 😉
Patrick
20 watt gives you dT of 40°C.
Assume heatsink temperature of 55°C (due to the cascode MOSFET), junction temperature will be 95°C.
In comparison, 32W for IRFP240 gives 82°C junction for 55°C sink.
I hope you have real good speaker protection circuit. 😉
Patrick
While debugging my script, I inadvertently ran one at 3.6 watts for a long time with no heatsink. It burned my plug-in proto board. It burned my finger. No damage to the device. It still test the same as all of the others.
I need to build a cascode test circuit to determine the 2nd harmonic "sweet-spot" behavior. There are 3 parameters to consider:
The LU1014D power dissipation will be Id*Vds
- bias current Id
- LU1014D Vds
- resistance between LU1014D drain and cascode FET source
The LU1014D power dissipation will be Id*Vds
> No damage to the device. It still test the same as all of the others.
What would be a good number for reliable lifetime in your audio gear ?
1 hour, 10 hours, or >1000 hours ?
Cheers,
Patrick
What would be a good number for reliable lifetime in your audio gear ?
1 hour, 10 hours, or >1000 hours ?
Cheers,
Patrick
That particular device will not go into anything I care about. I was just pointing out that the device did not melt down. I bought 150 pcs.
I have not yet made any measurements on these LU1014D JFETs, but the look real.
I ordered these: 50PC LU1014D LU1014 N- Mosfet Transistor NEW | eBay
I ordered these: 50PC LU1014D LU1014 N- Mosfet Transistor NEW | eBay
A while back I bought some off Ebay that were good fakes. Even looking at them side by side with known good ones they looked real but they checked out as mosfets not jfets. Sorry I don't recall the sellers name.
I will crank up my FrankenTracer and see what I have. It might require some modifications for the limited Vds voltage range of the LU1014D. I will probably just use a lower voltage transformer.
I have ordered some from greenhouses408 on ebay. They have 100% feedback, guess we will see if they are real soon.
Above 5v Vds, the LU1014 behaves strangely. If you keep Vds below 4v Vds, you should get good looking curves.
I have access Keithley sourcemeters and associated software. Limits for current and voltage are explicitly set. Power limits can also be set.
Last edited: