It looks good, here are some suggestions:
If you rotate the BA3 board 180 degree you can have much smaller input/output signal wires.
I would also place the BA3 board as far as possible from the transformers. If you place it more to the left you would probably have less interference from the transformers magnetic field.
You should also twist all those wires very tightly as it prevents them from acting as antenas for RF interference.
All this said, where did you purchase that case? What about the input/output and volume control boards?
Thanks!
Manuels
What about actually helping the poster by explaining why he should do that instead of just posting an useless sentence?
🙄
Looks great. One thing with the super reg...it works better if the "sense" wires are not jumpered at the super reg board like you have it. They work best if the sense lines are connected as close to the load as possible.
True, I did it that way with my super regs and the BA-3. But it's a very complex cabling scheme to do...
Thank you guys for the suggestions.
BA3 board will be rotated 180 and moved to the left.
I will also try to move voltage sense close to the load.
About wire twist ... are you referring to the input/output wires? or to the DC power wires?
In/out are absolutely not a problem, but power wires are single core so very hard (if not impossible) to twist.
Manuel,
chassis and volume control boards are from Lite audio. They offer many motorized and relays attenuators and input selection. I went for V03 (not the cheeper options 😉 )
Cheers
BA3 board will be rotated 180 and moved to the left.
I will also try to move voltage sense close to the load.
About wire twist ... are you referring to the input/output wires? or to the DC power wires?
In/out are absolutely not a problem, but power wires are single core so very hard (if not impossible) to twist.
Manuel,
chassis and volume control boards are from Lite audio. They offer many motorized and relays attenuators and input selection. I went for V03 (not the cheeper options 😉 )
Cheers
In my build I connected all phono sockets grounds together and then to the chassis through a CL60 per channel.
There are pics back in post 189 were you can just about see the conection.
The pic is out of date as I now use a transformer per channel.
The preamp works extremely well with a pair of Salas regs by the way although I haven't tried any other supplies. Very happy with it as it is😀
Thanks Marra.
Perhaps you could get better noise and separation results by connecting each channel's grounds to a CL60 ie two CL60's going to a common chassis point especially since you now have updated to two transformers and keeping the L and R grounds separate at the phono sockets.
Nash
Marra, I see the pic (pics are at 189 on 6L6 build guide) of the CL-60 connected to ground, but I cant see what it is hooked to on other end. I do see all of your ground tabs on input RCA plugs wired together, does it just hook to this ground wire? I assume all grounds, both channels hooked together through single CL-60?
And could you elaborate a little on your "update" in regard to CL-60 "now replaced with transformers" please?
I still have a slight, very slight pop between inputs when using selector switch. (tubecad.com unit 6L6 used in his build) It is a very slight pop, nothing obnoxious. Otherwise, pre is dead silent. Maybe this would help?
Did you not ground power supplies through a CL-60 to ground? Or did I just not see it, or some other scheme involved? Whoops! I see Nashbap just asked same question.
Thanks,
Russellc
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Hi Nash and Russell.
The channels are now totally separate as regards p/s each channel having it's own transformer. I had a slight hum problem with just the one trannie.
The grounds from the regs;four wires are all as Russell has noted all connected at the BA3 board and all RCA grounds are wired together per channel and connected to chassis through a CL60 per channel with no hum or switching noises.
Sorry I got my threads mixed.
Hope this helps..
The channels are now totally separate as regards p/s each channel having it's own transformer. I had a slight hum problem with just the one trannie.
The grounds from the regs;four wires are all as Russell has noted all connected at the BA3 board and all RCA grounds are wired together per channel and connected to chassis through a CL60 per channel with no hum or switching noises.
Sorry I got my threads mixed.
Hope this helps..
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One last clarifying question here, So "all RCA grounds are wired together per channel" and "connected to chassis through a CL-60 per channel."
By "per channel" you mean grounds of right channel all together, and all grounds of left channel together, EACH channel having its own CL-60 to ground. NOT all grounds of both channels together, grounded by a single CL-60 right?
Sorry to be thick here, but pic only shows one, and I want this right!
Russellc
You are right the picture doesn't show it very well but each channel is separate with it's own CL60 to chassis.
Thanks. Are the output RCA also included along with the input RCAs in this grounding scheme? All the RCA I see are, but hate to assume they are but only makes sense...just wiring up my second BA-3 FE preamp and am going to put this idea in practice...wiring this part now!
Thanks again for your clarifications
Russellc
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Looking closer, I can see it appears the RCAs that I suspected were outputs are....looking at where they are wired to on the BA-3 boards!
Thanks again!
Russellc
Thanks again!
Russellc
