[adamus]

both seem too big to me. 1amp slow blow should be ok on 240v, maybe 1.5amp.

 

[dean0]

Power supply tested, left on for a couple of hours no problems, had to adjust the voltage 3 times to keep it at 250v. Still waiting on panels before I go ahead and hook the rest up, more pic's later this week, I hope...

 

[GWorlDofSPACE]

Hi guys,

I am building this wonderful amp and was wondering if I could add bigger polypropylene caps as 1uF for C6 and on PSU C2? I am doing it whit regals tweak and for K-701 headphones whit NFB.
Please help!

Thanks.

 

[GWorlDofSPACE]

)

 

[runeight]

Yes, you can add the bigger caps just so long as they are rated for 250V.

 

[GWorlDofSPACE]

What size of cap? Has anyone experimented whit that? How about to remove the output electrolytic caps and replace whit polypropylene or oil?

 

[ntrl]

Another Bijou born.

Transformer custom ordered (In 220V, Out: 260V .15A x2 and 6.3V 3.5A).
Temporary Case is ikea's foodsaver.
Jeff's kit.

Ventilation holes

Ventilation holes

Temp of near tube

Temp of 6Н6П (6N6P)

Case temp

Heater

Thanks to authors of Bijou, Jeff and head-fi community.

PS. Where in Ebay buy good chassis for bijou < 40$ ?

 

[adamus]

basic but functional - but maybe a bit of a fire risk?

The last pic - not sure i would have so much exposed wire. it wouldnt take a lot to short them.

 

[_Snoopy_]

Has anybody tried leaving out C1? Should be o.k.for high-z headphones.

 

[dean0]

Finished my build but I have hum/buzz problem. With nothing connected, I can turn volume 20% with no noise then I get hum/buzz. If I touch starground and my volume knob the hum does decrease a little, also tried moving some wires with no success. When my DAC is connected the hum/buzz is worse, but music
plays fine.
Iam not using the NFB atm, and remove R12, and replaced R1 with 300ohm.
Voltages both measure a constant 250v on both boards.
Iam thinking that connecting starground to volume pot, and Amphead's Heater Mods may help, any ideas or input would be much appreciated.

 

[dean0]

okay, I seem to have solved one issue of noise when the DAC is not connected, running a peice of wire from the starground to the chassis got rid of noise, only on full volume their is a slight hum, bearly audioble.
But when the DAC is connected Iam still getting noise, alot less than before but it is there.
Iam using Gamma y2 DAC powered by usb and feed via Optical from my soundcard.
When I unplug the usb power source the noise goes, does that mean using a different 5v external powersupply would eliminate the problem?
Is their any negetive effects on SQ using Amphead's Heater Mods, I may do this mod to see what kind of effects it has.

 

[adamus]

have you grounded the IEC to the chassis (not the star ground?)

 

[ntrl]

My first impressions.

In 2006 i have Senn HD580 and build AMB M3. I was happy.
I could listen to music 4-5 hours. without any inconvenience to the ears and head. In 2009 I bought the AKG K701. AKG course much detail. But more than 2 hours I could not listen to music. began some inconvenience.

Now with BIJOU and AKG k701 I can safely listen music 4-5 hours.

PS. M3 with BB OPA627, source EMU 1212m.

 

[dean0]

Quote:

Originally Posted by adamus /img/forum/go_quote.gif have you grounded the IEC to the chassis (not the star ground?)

I have grounded the iec to starground. The starground is isolated from the chassis.

 

[mugdecoffee]

Quote:

Originally Posted by dean0 /img/forum/go_quote.gif okay, I seem to have solved one issue of noise when the DAC is not connected, running a peice of wire from the starground to the chassis got rid of noise, only on full volume their is a slight hum, bearly audioble. But when the DAC is connected Iam still getting noise, alot less than before but it is there. Iam using Gamma y2 DAC powered by usb and feed via Optical from my soundcard. When I unplug the usb power source the noise goes, does that mean using a different 5v external powersupply would eliminate the problem? Is their any negetive effects on SQ using Amphead's Heater Mods, I may do this mod to see what kind of effects it has.

I use an Opus DAC with my Bijou and with USB input I got lots of buzzing too which I realized stopped when I ran my laptop off of its battery. I ended up getting a plug adapter that disconnected the ground pin of my laptop charger (it connects with 2 pins now instead of three) and that fixed it. There's probably a better way (maybe a ground loop breaker?) but that worked for me.