[oneplustwo]

Here you go.

 

[aloksatoor]

Thanks!!

 

[NumLock]

About to start ordering parts. One question though. If I can get all the caps and resistors for free, how much would I save if I buy the boards, heat sinks, etc, over the glass jar kit?

 

[Pars]

Quote:

Originally Posted by Beefy /img/forum/go_quote.gif pompon believes in audible differences between power cables. Enough said

It will be interesting to see if pompon hears differences between his silver cable and a standard power cable with this. It is my premise that differences in power cables can be attributed to the quality of the PSU (or lack thereof).

 

[ezzieyguywuf]

I built my first cmoy last summer and plan on building a starving student next week. I've seen "beta 22" talked about, and seen a few finished builds in the "show off your builds" thread, but never really looked into it. I've taken a look at their website though, and lemme tell you, I've been drawn in. I mean, multiple inputs, multiple outputs, and a bunch of "discrete" crap I don't even understand? I build my own power supply?

This sounds like the ULTIMATE DIY project. Mark me down as "thinking about doing it". As soon as I graduate and get a job, I'm in.

 

[pompon]

Quote:

Originally Posted by Pars /img/forum/go_quote.gif It will be interesting to see if pompon hears differences between his silver cable and a standard power cable with this. It is my premise that differences in power cables can be attributed to the quality of the PSU (or lack thereof).

I am not doing a powercable ... I just want to know what is the lenght I need to wire a B22 balanced.

 

[nattonrice]

Length of what? Umbilical between the PSU and AMP?
Check the wiring and ground section of the b22 website for what AMB considers the longest length before causing problems.

 

[m1abrams]

Quote:

Originally Posted by pompon /img/forum/go_quote.gif I am not doing a powercable ... I just want to know what is the lenght I need to wire a B22 balanced.

We can not answer that question for you. You need to layout your boards in the case figure where you are going to have your connectors and measure.

 

[mhamel]

Just a note for anyone thinking of picking up a TKD attenuator for a build, and follow-up to my earlier comments about them.

I had written them asking if there was a 50K part available as it wasn't in the data sheet. Very friendly response, got back to me within a day. They will do custom builds with about a 30-45 day turnaround. No problems on a 50K, and they'll even do a 4-gang for balanced.

Far from cheap, but through the US distributor they sent me to, pricing works out to be a bit less for a custom 4-gang attenuator, including shipping, than it would be to buy 2 x stereo controls from Percy Audio + shipping.

-Mike

 

[SoapSeller]

Hi,
Lately I've noticed some power-off thump in one side with my ~2 years old balanced b22.
I'm not sure if this is a new thing for the amp or something that was always there.
(I've upgraded my headphones to HD800 recently)

I've rechecked all the voltages and for DC offset and everything seems in order.
Any idea where to look next?

 

[amb]

Does it thump with the volume set to minimum when you power off? The thump could be from the source if the volume is up. A β22/σ22 should emit almost no thump on power up or down.

 

[SoapSeller]

yes, it does...

I'm using TP Joshua Tree for volume control, and I have no idea how it behave on power-off.

 

[linuxworks]

if there is a thump on turn on/off then something is not 'symmetrical'. one of the design goals (as I understand it) is to BE symmetrical so that things are 'even' at turn on and off times.

maybe some component has drifted over time, throwing off the careful internal balance? or a solder connection started showing some resistance?

 

[pistolsnipe]

hey guys, just got around to testing my first sigma 22, and i am already ready to start onto the questions hah. i built the board for 30 volts, but i am getting +and- 22.03

would definately appreciate any help, i have triple checked all the values on the pars list, and they are correct as far as i could tell.



here are all the values i could easily get to

cr2 8.28
cr3 25.15
cr4 25.11
r1 46.01
r2 46.52

after bridge rectifiers : 46.5

i can possibly post hirez pics later tonight, thanks a lot guys!

 

[amb]

With the power off and all capacitors discharged, measure the resistance of your R8 and R10. Are these what you expect?
With power on, measure the voltage across D5. What is it?