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Bride of Zen, Bride of Son of Zen
Bride of Zen, Bride of Son of Zen
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Old 18th September 2013, 05:21 PM   #11
flg is offline flg  United States
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Any more questions
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Old 18th September 2013, 05:49 PM   #12
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Quote:
Are Zen and Son of Zen power amplifiers?

Are Bride of Zen and Bride of Son of Zen pre-amplifiers?

Does that mean that all Pass Brides are pre-amplifiers?

Is BOSOZ the same as Bride of Son of Zen?

Is this BOSOZ?
https://www.passdiy.com/project/prea...zen-line-stage
it includes
Yes

Yes

Yes

and

Yes
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Old 18th September 2013, 05:54 PM   #13
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Be aware that the BOZ has LOTS of gain. Most people don't need that much gain in their system. It is also easily overloaded at the input. My last mod to my BOZ has been to put a Hammond 124b 90k/10k transformer at the input before the volume control. Still has too much gain for my system, which is why I built a B-1.
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Old 19th December 2016, 05:10 PM   #14
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Hi guys,

I am building a BOSOZ preamp with my son. Already have a B1 that we built. My son needs more gain. I have some questions about the 5 Pots. I am building this version-

http://www.firstwatt.com/pdf/art_bosoz.pdf

with boutique components such as Mundorf M-Lytic and Obbligato gold caps. Resistors are Audio Note non magnetic tantalums and shinkoh tantalums, Kiwame, Amtrans and Takman Reys.

Which pot do I use as a volume control and can I use an alps or tkd pot? I want a remote volume control. I already have a spare TKD 2CP-2511 MC motorized 50K pot and an Alps Blue Velvet 50K motorized pot.

Can I combine some of the pots into 1 two channel pot?


I see from the schematics and parts list that the pots are linear. The Alps and TKD's are logarithmic. Does it matter?

I have read that this preamp has a lot of gain. Would it be better to use lower value pots at P3 and P4?

I am a novice at this. This build is probably a little over my head. The B1 was easy and came out sounding great. Any help is greatly appreciated.
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Old 19th December 2016, 05:40 PM   #15
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Quote:
P1 and P2 determine the input
impedance if used
put 10K pots there

that's your volume pot

instead of P3 and P4 put 5k fixed resistors ...... or leave them out and replace R11 and R12 with 5K

P5 is trimpot for gain setting
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Old 19th December 2016, 05:55 PM   #16
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BOSOZ requires 10k pots. 50k might be too high.

TKD and Alps will work. You'll need 4 monos, 2 stereo pots or a 4 deck pot.
Discrete stepped attenuators are the way to go. Discrete costs more, but you'll know where your money went. On the low end of cost, 4 mono wiper type pots will probably be more accurate since you can dial them in independently.

Log pots are ok. They are configured to have an increase in volume that's more natural to our ears. Linear will work, but when you turn it up, it will be a more abrupt volume adjustment.

Adjusting the gain isn't hard. I don't know how to do it. Probably require scaling the a pair of resistors. one of the resident rocket scientist could probably figure it out easily by looking at the schematic.
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Old 19th December 2016, 06:09 PM   #17
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Quote:
Originally Posted by Zen Mod View Post
put 10K pots there

that's your volume pot

instead of P3 and P4 put 5k fixed resistors ...... or leave them out and replace R11 and R12 with 5K

P5 is trimpot for gain setting
For P1 and P2 can I just use 1 stereo Alps Blue Velvet pot as I want a motorized remote volume control.

If I use 5K fixed resistors for P3-4, what wattage?

Thanks for the help,

Larry
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Old 19th December 2016, 06:19 PM   #18
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regular metal films (600mW) will do
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Old 19th December 2016, 08:06 PM   #19
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Got I think! I will use a stereo 10K motorized pot for p1 and p2 and 5K resistors for p3 and p3. Then another pot for p5.

Pass recommends a 500K pot for P5. If I use an Alps, will 250K be ok or should I just buy the recommended cheap 500K pot that is in the original parts list?

I would like to use ladder type pots but I already have too much money in the boutique caps and resistors. I can always add them latter on if we don't like the sound.

The preamp is going to be paired with a Parasound A21 amp and a DAC with 2.1mv input.
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Old 19th December 2016, 09:35 PM   #20
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P5 trimpot (set and close the lid) 500R

what with 2.1mV ?

typo?
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