A few years back my stock (bought assembled) MX50x2 incinerated at power up. (One channel only.) I rebuilt with genuine Toshiba 2SC5200N and TTA004/TTC004 from Mouser and it was fine. I don't like the 2SD1047 that come with these kits... [Considering that 2SC5200 cost more I suspect that the manufacturer might have come to a similar conclusion.]
Never had a failure with Toshiba 2SC5200N or the old transistors removed from junked (recycled) receivers.
Never had a failure with Toshiba 2SC5200N or the old transistors removed from junked (recycled) receivers.
@kozard Thank you for the information. I like Toshiba transistors, they are made of Triple Diffused method, and I am professionally knows what's that.
I simulated in the Micro-Cap 12, the Toshiba TTC5200 did have a little bit high THD numbers, but the real listening tell another story. Even I am worrying about the quiescent currents variance, but the static voltage at the output have very satisfactory numbers 0.1mV and 1.4mV.
I simulated in the Micro-Cap 12, the Toshiba TTC5200 did have a little bit high THD numbers, but the real listening tell another story. Even I am worrying about the quiescent currents variance, but the static voltage at the output have very satisfactory numbers 0.1mV and 1.4mV.
Yes ... In fact , see here https://www.diyaudio.com/community/...ain-stability-simulated-vs-real-world.407089/
Sorry, no schematics availaible
I've asked LJM_LJM , and his answer is :
" Cannot reduce magnification. There will be self-excitement. Oscillation "
And didn't answered when I asked him to provide schematics
Markings on some electronic components have been erased on boards ,
The components are misemployed, tantal smd as input/output capacitors...missing space to replace
Nothing to do with this junk, > trash-can, 15$ lost .
There are lots of good preamp kits on Aliexpress, discrete and IC. What do you need the preamp for?
Sometimes you just need to change the IC for a a legit one bought on Mouser or elsewhere.
For discrete preamp that would be more difficult. Also adding a good power supply, also available on AE, can improve things. Sometimes the kit already has a good PS included, even a kit with transformer.
Sometimes you just need to change the IC for a a legit one bought on Mouser or elsewhere.
For discrete preamp that would be more difficult. Also adding a good power supply, also available on AE, can improve things. Sometimes the kit already has a good PS included, even a kit with transformer.
I ve just bought this preamp by curiosity (single-ended with 2 npn transistors) , after I read it was described as the 8th wonder of the world by LJM_LJM
https://www.diyaudio.com/community/threads/ljm-audio.180625/page-53#post-4752813
I was really disappointed, compared to other parts from LJM_LJM, L15 Mos amplifier , excellent quality/price ratio
https://www.diyaudio.com/community/threads/ljm-audio.180625/page-53#post-4752813
I was really disappointed, compared to other parts from LJM_LJM, L15 Mos amplifier , excellent quality/price ratio