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Mezmerize DCB1 Building Thread
Mezmerize DCB1 Building Thread
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Old 21st February 2019, 02:09 AM   #2091
AmpUtator is offline AmpUtator  United States
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Mezmerize DCB1 Building Thread
How do I check my JFET's idss for this project?
Once I get the testing completed I can start building the DCB1.

I have what is suppose to be Toshiba 2SK170BL's and Linear's LSK170A's.
I'm not sure which brand/version will be best to use in the DCB1.

Thanks for any help.

Last edited by AmpUtator; 21st February 2019 at 02:10 AM. Reason: remove spacing
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Old 21st February 2019, 03:09 AM   #2092
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Use the BLs for the quad and the As for the PSU section. Both are good FETs it's just their different IDSS classes are better to be distributed that way in the DCB1.

For the Toshiba BLs post a close up picture of one in case you suspect fakes. We are usually able to tell.

As for measuring IDSS see this link: Transistor matching - JFET
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Old 22nd February 2019, 01:33 PM   #2093
AmpUtator is offline AmpUtator  United States
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Mezmerize DCB1 Building Thread
Hi salas,
Thank you for the link.

Here's a few photos of the Toshiba LSK170-BL's that I recently purchased and also a photo of LSJ74-BL's that I purchased at the same time.

Some of them have a visible line over top of the number 8 and some don't or either they faded over time.

What is the meaning of the line?

Do they look like real Toshiba's?
Thanks.
Attached Images
File Type: jpg LSK170BL-(1).JPG (175.4 KB, 160 views)
File Type: jpg LSK170BL-(2).JPG (223.8 KB, 157 views)
File Type: jpg LSK170BL-(3).JPG (207.7 KB, 153 views)
File Type: jpg LSJ74-BL.jpg (153.8 KB, 151 views)
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Old 22nd February 2019, 01:43 PM   #2094
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
The print, the head shape, and the legs, look legit. If they will also show IDSS within the limits of BL category as stated in their Toshiba datasheets, they should be trustworthy.
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Old 22nd February 2019, 02:02 PM   #2095
AmpUtator is offline AmpUtator  United States
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Mezmerize DCB1 Building Thread
Awesome, Thank you .
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Old 22nd February 2019, 02:58 PM   #2096
RCruz is offline RCruz  Switzerland
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Mezmerize DCB1 Building Thread
I would also search for high gm so to be sure they are not fakes.
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Old 22nd February 2019, 08:53 PM   #2097
Eric is offline Eric  United States
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Mezmerize DCB1 Building Thread
this might be useful for others...
Attached Images
File Type: jpg Authentic jFets.jpg (223.6 KB, 122 views)
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Old 23rd February 2019, 11:15 PM   #2098
OhSoJoe is offline OhSoJoe  United States
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Finally finished my Mez that I started building 3 years ago right before moving and starting a PhD. How na´ve. But now I'm writing a dissertation and procrastinating hard with some DIY audio. Shown with my JFET Phono stage in the second pic.

Sounds great no matter what I plug into it. Thanks all.
Attached Images
File Type: jpg Mez_JDel@0,5x.jpg (167.0 KB, 59 views)
File Type: jpg PH_Mez_Fronts_Jdel@0,5x.jpg (258.9 KB, 54 views)
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Old 23rd February 2019, 11:22 PM   #2099
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Looking very nice in wood. Congratulations!
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Old 2nd March 2019, 12:58 PM   #2100
Domg is offline Domg  United Kingdom
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I’m getting parts together for a balanced Hypnotize. Looking for resistors.
220R Shinkoh
220K Looking for Riken RMG, but can’t find - dose anyone know a source?
1M Can find Riken RMG 910K - is this close enough?
Any thoughts/recommend alternatives?
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