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B1 with Korg Triode
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Old 14th April 2019, 08:31 PM   #2031
JSA1971 is offline JSA1971  Canada
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B1 with Korg Triode
Quote:
Originally Posted by carsten.witt View Post
Size is 140mm x 83mm
Thanks for posting this! I asked about the size in the DiyStore last week and still havenít heard a response. 👍🏻
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Old 14th April 2019, 08:32 PM   #2032
JSA1971 is offline JSA1971  Canada
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Quote:
Originally Posted by Nelson Pass View Post
Most DIYers have vivid imaginations. Me, I like to have a turntable rotating
vinyl playing when I listen to CD's.

😂
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Old 15th April 2019, 11:58 PM   #2033
yoshida is offline yoshida  Japan
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I made a test bench with the PCB from diyaudiostore.
I think the sound is different from the original because I selected parts in Japan,but It's sound is good. Thank you to Nelson and the community.


I did two tests.


Reduce microphonic noise with a magnet.
The result was similar to that of post# 1745.The potential at T7, 8 changes, and the sound changes accordingly.
I do not adopt this method, for fear of the side effects that magnets give to electronic devices.


Fairchild J113 (supplied with pcb) vs Toshiba 2SK170
I placed the socket at the Q1, Q2, R1 position of the PCB and changed the parts.2sk170 are GR grade, matched. The potential of T7, 8 is adjusted each time.
Of course, I know that 2sk170 is more expensive and this is not a strict test.
The result: Both sound good and the differences are quite small.
The 2sk170 may sound slightly solid, but it is probably my assumption.
I choose J113 and keep 2sk170 for the next project.
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Old 16th April 2019, 04:20 AM   #2034
cubicincher is offline cubicincher  Germany
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Hello yoshida,


interesting information. Difference between 2sk170 and J113 in this build not being such a big difference.
Have fun and continue.


Greets to Japan
Dirk
Kampai
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Old 16th April 2019, 06:38 PM   #2035
Nelson Pass is offline Nelson Pass  United States
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B1 with Korg Triode
Quote:
Originally Posted by cubicincher View Post
Difference between 2sk170 and J113 in this build not being such a big difference.
If you're paying $20 each for the Toshibas, there is about $150 difference.

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Old 16th April 2019, 06:47 PM   #2036
MEPER is online now MEPER  Denmark
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Does J113 exist in different "grades" like the 2sk170 so it could be a "replacement" for other projects?
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Old 16th April 2019, 06:58 PM   #2037
Dennis Hui is offline Dennis Hui  Canada
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It seems J113 is already the low Idss part in its family:

https://www.mouser.com/ds/2/149/J113-889353.pdf
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Old 16th April 2019, 06:59 PM   #2038
Nelson Pass is offline Nelson Pass  United States
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J113's are all over the map, especially after OnSemi took them over.

25% or so are in the 6 to 8 mA range. Most of the rest are 20+. This is by
split by lot codes, and so my "raw" inventory is sorted that way and when I
want the lower Idss, I go to those lot codes.

It is unknown which group is before/after the ownership transition, but
I have found plenty of uses in both categories.
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Old 16th April 2019, 07:18 PM   #2039
dcbingaman is offline dcbingaman  United States
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Default Linearity

Nelson, you know there are only a handful of truly linear low plate/drain/collector devices on the planet. For small signals, the Toshiba JFETS have long been the best. For large signals you have your Semisouth parts and the Sony 2SK82 and 2SJ28. The IRF240 is probably another one IF you bias it high enough.

On the tube side you have a variety of miniatures (12AX7, 12AU7, 6DJ8, 7DJ8), and two biggies (the 300B and the EL34 in Ultralinear grid connection). IMHO, EVERY great amplifier in existence is built around these parts. Everything else requires a lot of monkey work to make halfway linear and ends up compromised by part count alone.

My question - only Linear Systems has tried to resurrect a couple of these devices - the Toshiba JFETS. I know that the MOSIS project has supported the fabrication of custom IC's for many years (see:MOSIS Integrated Circuit Fabrication Service). Why hasn't a comparable provider stepped up to make custom linear amplification devices ? It would seem to me they could print money if they did.
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Old 16th April 2019, 07:19 PM   #2040
MEPER is online now MEPER  Denmark
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They seems to only specify a min. Idss for J111, J112 and J113.
J113 has a min. Idss = 2.0 mA.…..but what can that be used for when most has 20+?
If it was typical values then the "number" J11x was the "grade".
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