B1 Buffer Preamp

[voxxonline]

Changed to old ones. Hum has gone.
Can be the problem in placing them outboard ? Let's say wires pick up hum (they are short though , 4 cm long) from other components ?

 

[6L6]

Probably just bad caps.

Outboard can be an issue, but in this case it's likely not a big problem.

 

[voxxonline]

Going to order another of the same. Mbgo caps are the best sounding indeed

 

[KatieandDad]

I used Obliago 10uF PIOs reliable and nice sounding for the output caps and 1.0uF MKPs on the inputs.

 

[voxxonline]

Dunno.. maybe can order from different source.
Or obblig's as it was my second choice.

 

[Nisbeth]

Made a new and more compact PCB layout for the B1 (which I already have a couple of versions of).

For details, click the link to my blog Comments are very welcome.

/U.

 

[Arick]

Neet, Clean, Simple!!!
Very nice work
Are you planning a group by?
Eric

 

[clm811]

Yes!

Group buy PLEEEASE?
-Chas

 

[Nisbeth]

No, nothing at all. However, if anyone else wants to do a GB of some sort I'd happily share the files.

/U.

 

[6L6]

A wonderful idea!

Don't forget to ask Nelson for permission... (although it will likely be no problem)

 

[sachu888]

Hi,
I can arrange very good quality PCBs at very reasonable price.

Regards,
Sachin

 

[bonzo15011978]

PIO caps

Hi,
I finished mine today.
100k stpped attenuator and a cople of HUGE PIO caps.
There wasn't room for a PSU, do I use battery instead.
Nice and open sound, but a bit light on bass, do you think bypass caps could help?

Ciao!

 

[tinitus]

hey, you can get nice battery 'box' like the ones used for guitars

 

[merlin2069er]

Hey, I wouldn't mind one of those b1 redux models.
(when it becomes available)

 

[Nisbeth]

Haha, I remember seeing a picture of a Hiraga amp with a 4U rack for the PSU (had more than 1F supply capacitance) and then the amp boards on two medium-sized heat sinks on the back - this is pretty much the opposite

/U.

 

[merlin2069er]

Hi,
I finished mine today.
100k stpped attenuator and a cople of HUGE PIO caps.
There wasn't room for a PSU, do I use battery instead.
Nice and open sound, but a bit light on bass, do you think bypass caps could help?

Ciao!

Wow, those caps are huge.

 

[wboyd]

That happens to me when my batteries get low as well...try and charge or replace your batteries.

 

[bonzo15011978]

Haha, I remember seeing a picture of a Hiraga amp with a 4U rack for the PSU (had more than 1F supply capacitance) and then the amp boards on two medium-sized heat sinks on the back - this is pretty much the opposite

/U.

You're right!!

 

[bonzo15011978]

hey, you can get nice battery 'box' like the ones used for guitars

Yes, i know, but I spent all my money on caps...
Seriously, I thought it's ok because they're hidden behind the preamp..

 

[voxxonline]

Is bass with 10000uf going to be very different to 15000uf ?