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Bijou All Tube Futterman Headphone Amplifier - Page 261

post #3901 of 4114

Thanks. It's from FPE.

post #3902 of 4114

Pabbi's amp has a new home!

 

beyersmile.png

post #3903 of 4114

Sweet post some pics :)

 

post #3904 of 4114

It needs to be recased... seriously... but, how does it sound? I haven't heard it for about 2.5 years. I would love for someone to step it up from 6n1p/6n6p, to at least some 6n23 or 6h30. She is a beautiful thing with Senn or LCD-2.

post #3905 of 4114

So your Bijou worked well with the LCD's? I tried a pair with mine at our AZ meet recently, but it seems that they really work better with a couple of watts.

post #3906 of 4114

Ah, the one I built was balanced, with a wee bit of extra gain... it would even drive k1k pretty well.  :-)

post #3907 of 4114
I decided to bring it down. I noticed one of the caps on the output has a hump on top. I remember reading that there is a chance of a slimer :-(

I checked voltages at the output of the PS and there is 250 VDC and it adjusts fine.
The other PS is 260 VDC and won't adjust.

O well I guess its time to re-read the thread again and try to find solutions.
Knew I should of taken notes mad.gif
post #3908 of 4114

Durr maybe I should just ask you guys!

 

What are voltages I should check? What should the values be?  All the tubes light.  I have a fluke multi.

 

 6.3v AC at the heaters I use both leads on both wire inputs

290v AC at the PSU inputs at each of the 4 260V AC inputs using star as ground

 

250v DC output on 1 PSU

265v DC output on the other PSU.

 

Should I measure something else?


Edited by Coupe - 5/28/11 at 3:09pm
post #3909 of 4114

I would start here as all of the expected voltages are nicely documented:

 

http://www.cavalliaudio.com/diy/bijou/main.php?page=troubleshooting

post #3910 of 4114
Quote:
Originally Posted by jdkJake View Post

I would start here as all of the expected voltages are nicely documented:

 

http://www.cavalliaudio.com/diy/bijou/main.php?page=troubleshooting



Ahh nice TY I forgot about that :)

post #3911 of 4114

Sorry for the post spam.

 

I wasn't sure what side of the resistor to measure.  Does voltage increase after going through the resistor?  Is that a constant?

 

PSU #1

 

Input #1 : 290 V AC 

Input #2 : 290 V AC

Output  :  248 V DC

R7        : 288 V DC and 252 V DC out

R8        : 324 V DC and  288 V DC out

 

 

 

 

PSU #2

Input #1 : 290 V AC

Input #2 : 290 V AC

Output  : 265 V DC

R7        : 300 V DC and 270 V DC

R8        : 332 V DC  and 300 V DC

post #3912 of 4114
Voltage does not increase going through a resistor. In fact, just the opposite is true.

In order to determine which side to measure, you need to follow the schematic and actual board layout and see the next part in the sequence. That will indicate the proper side to make the measurement.
post #3913 of 4114
Just guessing but check that the Z1 diode is correctly oriented ( i did put it the wrong way the i was stuck at about 260V)
post #3914 of 4114
Quote:
Originally Posted by yiancar View Post

Just guessing but check that the Z1 diode is correctly oriented ( i did put it the wrong way the i was stuck at about 260V)


Thank you for the suggestion.  However, this amp was pabbi's and although it has gone through a few owners; I doubt anyone would change the diode from a working amp.

post #3915 of 4114

hello

can you confirm that bijou kit could be an upgrade from ss matrix m stage? that budget ss got great opinions but I think theres some lack of power and general I feel that cans have even more potential to discover. I use vintage beyerdynamic dt880S/600ohm. anyone went such path from great budget ss to bijou?

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