B1 Buffer Preamp

[dtaylo3]

I presume you mean multiple "line outs" not "speaker outs." Per Speakerbox's reply, you could certainly and easily do that. In the most simple of forms, a toggle switch would work.

 

[Beejeeb]

Aye, apologies for that, I was thinking 'speaker selector' based on how it would be labeled, but indeed I'm just looking to be able to select which line out will be active.

 

[Spe@kerBox]

Get a quality switch. Silver contacts if you can find them.

 

[Beejeeb]

I've historically spec'd Shallcos, but for this build they're too big. I won't skimp.

 

[Itsmee]

This would fit the bill, 6 in, 1 out, or 1 in and 6 out.
Mezmerize B1 Buffer – diyAudio Store

Speaker switching would be a beefed up version without the B1 & shunt PSU.

 

[Adagio]

I really love this version of the B1, don’t underestimate good components and careful matching. This is the best I’ve heard yet.... period. I’m scrapping money for a nice attenuator next, switch for input, WBT next gen and a nice case.
The sound is so extremely delicate and real. Later I will test it against a 10000 preamp.... I already know the winner.

 

[2 picoDumbs]

Awesome

 

[dab]

atwater kent radio

looks similar and just as cool



Atwater Kent Radio Website

 

[dab]

better pic

 

[Skylar88]

Adagio, I really love your version of the B1. "Dead-bug" style is always interesting to see.

Not to take anything away from your achievement, here is my own B1 version built on Paxolin sheet. It sounds absolutely gorgeous; especially when used with the H2 Rev 1. That combination just sounds "right" to me.

 

[ginetto61]

I really love this version of the B1, don’t underestimate good components and careful matching. This is the best I’ve heard yet.... period. I’m scrapping money for a nice attenuator next, switch for input, WBT next gen and a nice case.
The sound is so extremely delicate and real. Later I will test it against a 10000 preamp.... I already know the winner

Hi ! really impressive display of high quality parts.
Could you share any detail about the power supply maybe ? thanks, gino

 

[Adagio]

Hi! Well that is the part exept attenuator and input selector I haven’t got around to yet. Right now I use a simple low ripple 18,5V power supply from LG.
A linear design will be presented later this year.

 

[ginetto61]

Hi! Well that is the part exept attenuator and input selector I haven’t got around to yet. Right now I use a simple low ripple 18,5V power supply from LG.
A linear design will be presented later this year.

Thanks and very interesting. I wonder if there are any info about the PSRR vs. frequency of this very nice circuit.

 

[rikiheck]

I listened tonight to my balanced B1 and was really blown away by it. It's made me think about building it again but with better parts. Are there Gerber files (or whatever) of the PCB so I could get some more made? (I assume these are not readily available at this point.)


Of course, there is the alternative of doing point to point wiring, but I'd prefer a PCB.

 

[Beejeeb]

B1 PCBs are still available from PassDiy

 

[rikiheck]

OK! Thanks!

 

[ginetto61]

ref. to post 4622

Are you using any passive filtering on the DC voltage coming from the smps ?

 

[2 picoDumbs]

What is the lowest value output resistor you guys have successfully used. I'm still using the stock value.
Anyone got it down to 47 Ohms?

 

[Stanislav]

I am at 100R.
Been there for a couple of years.
Before that was at 220R.

All good, no intention to go any lower.

 

[2 picoDumbs]

Yeah.
100 would be good enough.