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The BA-3 as preamp build guide
The BA-3 as preamp build guide
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Old 18th May 2021, 10:39 AM   #2091
Zen Mod is offline Zen Mod  Serbia
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The BA-3 as preamp build guide
yes, you can use linear supply for ACA

be aware that for BA3 FE you need small current supply, so small xformer and rectifier/regulator pcb is solving that

then, for ACA, use big one, either switcher or linear
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Old 18th May 2021, 06:40 PM   #2092
Russellc is offline Russellc  United States
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The BA-3 as preamp build guide
Quote:
Originally Posted by 6L6 View Post
Every Pass preamp uses the Muses volume. Itís incredibly good.
Hmmm. I did not know that. Guess after all these years I should build one. (as volume control, I need gain!).

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Old 18th May 2021, 07:14 PM   #2093
Freecrowder is offline Freecrowder  United States
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So just wondering I started reading this from the beginning and noticed your comments on using R2 to silence the switched resistor volume control. I have another preamp with switched volume and balance control. It produces loud pops when changing volume. How does R2 alleviate this and could I use it on mine maybe.
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Old 19th May 2021, 02:41 PM   #2094
McQuaide is offline McQuaide  United States
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Quote:
Originally Posted by Russellc View Post
Hmmm. I did not know that. Guess after all these years I should build one. (as volume control, I need gain!).

Russellc
It's just an attenuator, will not affect gain. It's a challenge if you don't build surface mount devices (think of a cap 1mm long and if you drop it, just get another one because you won't be able to find it). I looked at some YT videos and found it was doable.
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Old 19th May 2021, 07:17 PM   #2095
amandarae is offline amandarae  Philippines
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Quote:
Originally Posted by 6L6 View Post
Every Pass preamp uses the Muses volume. Itís incredibly good.
Excellent combo!

BA-3 and Muses 72320. BA-3 rails at +-30 Vdc

I also use the Muses for BA2018 LS and it really compliments the linestage.
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Old 19th May 2021, 07:38 PM   #2096
myleftear is offline myleftear  Switzerland
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The BA-3 as preamp build guide
How do you feed (=power) the muses?
(and is this a vrdn with the BA-3?)
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Old 19th May 2021, 08:34 PM   #2097
amandarae is offline amandarae  Philippines
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Originally Posted by myleftear View Post
How do you feed (=power) the muses?
(and is this a vrdn with the BA-3?)
The VRDN powers the Muses (+-15 Vdc). The BA-3 has its own PSU (Sigma 22).
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Old 25th May 2021, 03:36 PM   #2098
PJN is offline PJN  United States
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Finally got my BA-3 preamp in a decent case. I used the largest galaxy 2U from the DIYA store, it proved to be a bit of a tight fit, but it worked out well. I had the chance to try it out with my F4 replacing the Doug Self preamp that I had in that service. Good news is that it has that extra bit of gain that I was looking for. Not a big difference sonically though, maybe a bit more ease and naturalness, maybe a bit deeper soundstage. Very good imaging, but the differences are subtle and could due proud parent syndrome for my latest project, or due to the bourbon that I was enjoying. In any event I'll leave it in the system for a while to enjoy.
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Old 25th May 2021, 04:34 PM   #2099
myleftear is offline myleftear  Switzerland
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The BA-3 as preamp build guide
Nice!
May I ask how you implemented the mute? (Input to nothing?)
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Old 25th May 2021, 06:39 PM   #2100
PJN is offline PJN  United States
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Yep, input on the selector board left empty. Used an inexpensive Chinese board from eBay, works great, even included the little blue LEDs.
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