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B1 Buffer Preamp
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Old 24th June 2013, 11:36 AM   #3751
KatieandDad is offline KatieandDad  United Kingdom
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I seem to recall that the Obligattos were only about £9 each.
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Old 24th June 2013, 12:45 PM   #3752
KatieandDad is offline KatieandDad  United Kingdom
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Quote:
Originally Posted by voxxonline View Post
Ok. Regarding Obbligatos. I like them (thanx to KatieandDad) but I think very worthwhile alternative is my MBGO 2 caps NOS from Russia.
I might reverse back to them after all...
You can use anything you like as long as you can make it fit. Although the Obligattos are HUGE they did fit.
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Old 24th June 2013, 01:00 PM   #3753
udailey is offline udailey  United States
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B1 Buffer Preamp
Great bang for buck cap.
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purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
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Old 27th June 2013, 04:00 PM   #3754
sangeet2 is offline sangeet2  Germany
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Dont´t know where I should post in this thread with my problem, so I try here.

As soon as I turn the volume down in my B1, also the high frequencies getting damped.
I have to say that in the first place I installed the transsitors wrong with 180 degree. Now I installed them correct but the problem remains
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Old 27th June 2013, 04:28 PM   #3755
KatieandDad is offline KatieandDad  United Kingdom
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Are you using Pass B1 or one of the derivatives ?
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Old 27th June 2013, 05:02 PM   #3756
sangeet2 is offline sangeet2  Germany
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I am using a PCB which I found here
DIY Audio Projects Forum • Pass B1 buffer clone (be1) with layout - A weekend project.
Attached Files
File Type: pdf B1 buffer preamp board.pdf (55.6 KB, 125 views)
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Old 27th June 2013, 08:19 PM   #3757
Itsmee is offline Itsmee  England
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What value is the pot? Is it before or after the B1.
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Old 27th June 2013, 08:48 PM   #3758
sangeet2 is offline sangeet2  Germany
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I tried different pots from 10k to 50k. Its (of course) before
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Old 27th June 2013, 09:30 PM   #3759
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by sangeet2 View Post
I installed the transistors wrong with 180 degree. Now I installed them correct but the problem remains
JFETs are symmetrical in construction so should have survived, but thats no guarantee.

Do you have access to an oscilloscope and signal generator to see if you have a bandwidth problem when the signal is attenuated.
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Old 27th June 2013, 11:00 PM   #3760
sangeet2 is offline sangeet2  Germany
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Hmmm, I have my ears

Also I do have Pink Noise generator from Logic as software and some software scope
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