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Old 8th February 2015, 06:36 PM   #41
6L6 is offline 6L6  United States
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The diyAudio build guides
The B1 buffer preamp...


https://www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf
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Old 8th February 2015, 07:03 PM   #42
Nosian is offline Nosian
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thank you so much.
why output cap? can one ignore that? or is there any dc out?
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Old 8th February 2015, 07:24 PM   #43
AndrewT is offline AndrewT  Scotland
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B1 has half the supply voltage as an output offset.
You must use a DC blocking capacitor.
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Old 8th February 2015, 07:30 PM   #44
6L6 is offline 6L6  United States
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If you would like a discrete buffer with no caps, try the DCB1 "Mesmerize" Mezmerize B1 Buffer Preamp (Makes 2 channels; Rev 1.0) - Circuit Boards
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Old 8th February 2015, 07:43 PM   #45
craigtone is offline craigtone  United States
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Quote:
Originally Posted by Nosian View Post
i have seen some very simple input stage from NP. only putting together with a volume control for impedance matching. can't find it now. any help please?
B1 Buffer maybe?
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Old 8th February 2015, 08:06 PM   #46
Nosian is offline Nosian
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thanks boys, but mezmez is compositely different concept. long away from the Zen.

the B1 will be fine, I have input caps inside the T-amps so i do not need theme.

what about that output resistor 1K?
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Old 8th February 2015, 08:33 PM   #47
Nosian is offline Nosian
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Default transistors?

"All of the transistors are N channel JFETs. The stock parts are 2SK170ís,
LSK170ís or 2SK370ís ..."

4transistors. all the same?

ex When I serch Farnell for 2SK170 i get these. is any of them the right one? any pakage I'll do it ptp.
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Old 8th February 2015, 09:14 PM   #48
craigtone is offline craigtone  United States
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I chose the Mesmerize personally as I also run an Aleph J with is cap coupled. I do not like capacitors and their "sound" which is the reason I chose the Mezmerize over the B1. The signal path is very simple ... pot, resistor, JFET, resistor. Spencer here on the forum is a good source for legit JFET's (not eBay China clones). He can also match them for you and his prices are reasonable.
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Old 9th February 2015, 08:49 AM   #49
Nosian is offline Nosian
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thanks craigtone,

and Q100 and Q101 are the same?

i tried to search Spencer, not successful. tell me you nice guys where can I find him?
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Old 9th February 2015, 09:20 AM   #50
ColinA is offline ColinA  United Kingdom
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thanks craigtone,
and Q100 and Q101 are the same?
i tried to search Spencer, not successful. tell me you nice guys where can I find him?
skcheung68@hotmail.com
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