I now have 400 pcs of LD1014D. There are several different arrangements of numerical strings in adjacent location on the tape that holds the parts. I will do some sorting and curve tracing and see if I can discover a pattern.
As long as all the parts have the triode curves, I don't care that the parts are not all identically marked.
Having tested and sorted ~500 pcs from Mr Pass's stash, as long as you have a large enough population, you will get mostly (>95%) matched pairs.
As long as all the parts have the triode curves, I don't care that the parts are not all identically marked.
Having tested and sorted ~500 pcs from Mr Pass's stash, as long as you have a large enough population, you will get mostly (>95%) matched pairs.
Hi, wondering what is the damping factor for this amplifier with 8 ohm output?
I tested the SE 2SK180 VFET amplifier with Vds of 34Vdc is about 1.5.
Johnny
I tested the SE 2SK180 VFET amplifier with Vds of 34Vdc is about 1.5.
Johnny
I got a strip of 50 last week, a mix of 3 different type. A few of those I can't see the marking without a magnifier.
The predicted DF for the LuFo is about 150. That depends on an inductor that holds enough energy for bass frequency.
My guess is that the original manufacturer made this strip and placed these parts. I doubt that a recycler in China goes to the trouble of mounting these in a strip that is used in a pick-and-place machine and then sells them for USD $0.17/each.
That looks like an completely incorrect part error on the factory that loaded the tape reel. That part has a different tab shape and the simple is in a different location altogether. Is it even labeled LD1014D?
Yes, it is labeled LD1014D. The date/lot code is different than the others - it ends in H, whereas the other package type has a code ending in G. Perhaps it's just from another production run?
Unfortunately, it will likely be a long while before I can confirm either way.
Thanks X.
No goop yet, there’s a few details I want to button up, like the M2X standoffs and cleaning the flux off the bottom side of pcb. Then apply thermal goop and tighten down.
No goop yet, there’s a few details I want to button up, like the M2X standoffs and cleaning the flux off the bottom side of pcb. Then apply thermal goop and tighten down.
Very nice work as always Vunce! I am happy to see oversized areas for the input cap as I suspect, like the MOFO, that this design will be highly sensitive to input capacitor brands/types. Although the differences are probably not commensurate with cost.
Best,
Anand.
Best,
Anand.
Your are a good spy indeed TA! 😉
FQA40N25
Yes Anand, nice real estate allowed for the input and output bypass film capacitors. Go conservative or wild with them. 😀
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