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Bijou All Tube Futterman Headphone Amplifier - Page 271

post #4051 of 4111

I took a look at everything and the fuse is intact and nothing seems burnt. It didn't smell like burning components before I powered it off. Resistance in the transformer seems to be the same as before. Something got hot though, probably just rosin burning off. I hope the capacitors are OK but I don't have any way to check. I guess I just need a new rectifier tube. Anyone dealt with a bad tube that's arcing and sparking and popping inside? I'd love any input!

post #4052 of 4111

Do you have a multimeter?  That would be the best way to check the caps, although remember when you do this that:

a) they may still have significant charge left

b) the rest of the circuit can affect the results you see.  

 

First, is your zener installed in the right direction?  

 

Also, I know you've double checked more than once, but walk through the circuit diagram and review all your resistors: their locations are important.  For instance, there is a 30.1k and a 301 ohm.  They're easy to misplace on the board!  Likewise, review your caps, too.  There is a 470u and a 47u.    

 

The answer is in there somewhere.  Good luck and stick with it!


Edited by bhjazz - 11/26/13 at 2:21pm
post #4053 of 4111

Thanks for the tips, but it's fixed and running! It was a bad rectifier tube after all. Too much triple-checking went on to install something wrong. I'll update the DIY log thread if you want to have a look. I'm pretty darn happy except the case gets way too hot with the top cover on. I'll have to figure something out in the future. Now, for some classic rock and that beer :)

post #4054 of 4111

My power supplie's (almost) finished :)

http://s13.postimg.org/etvcepmp3/2013_12_27_082.jpg

 

 

There's a power switch in the electrical inlet connector, but do you think it would look better with a power switch in the front? If so any suggestions?
 

post #4055 of 4111

I use this one, which allows you to switch the heaters on first, then the B+.

 

http://glass-ware.stores.yahoo.net/acswitch.html

post #4056 of 4111
Quote:
Originally Posted by vlb View Post
 

My power supplie's (almost) finished :)

http://s13.postimg.org/etvcepmp3/2013_12_27_082.jpg

 

 

There's a power switch in the electrical inlet connector, but do you think it would look better with a power switch in the front? If so any suggestions?
 

 

Probably depends on how often you would use it.  For my own builds, I like the switch on the back.  Your own visual design will probably be different!  

 

Quote:
Originally Posted by funch View Post
 

I use this one, which allows you to switch the heaters on first, then the B+.

 

http://glass-ware.stores.yahoo.net/acswitch.html

 

I like that very much.  What a great find!

post #4057 of 4111

Can anyone explain how the pase splitter (V1B) is biased?
Is the plate voltage of V1A a few volts lower than the cathode of V1B?


Edited by vlb - 12/29/13 at 12:39pm
post #4058 of 4111

Time for another question.

Im using my bijou both as preamp and headphone amp. I dont think the 120uf cap should be used for a line load because of the low cutoff point.

 

Is this circut a good solution? Can I feel safe operating the red switch with the amp turned on?

 

post #4059 of 4111

Suddenly one channel stopped working:S

 

The problem is around the ecc99 circuit. Pin 1,2,3 of the ecc99 measure ~220v were pin 3 should have been ~120v. Pin 8 of the tube is at 0v instead of 2.2v. I changed the tube with a working one and still the same. Any idea which component might have failed?

post #4060 of 4111

yiancar: I would start checking d1-d6. Use the dvm:s diode test function to test each diode for connection/correct voltage drop, with the amp turned off ;)

post #4061 of 4111

Stupid me one of the heaters of the ecc99 was not connected...:@

post #4062 of 4111

Hi,

Could you advice me what fuse I should use for powering from 220 VAC?

I think 0.3A will be good...

Like this

http://www.digikey.com/product-detail/en/5TT%20300-R/507-1287-ND/1009059

 

Or need I use fuse with lower current limit to be on the safe side?

 

-- Thanks

Victor


Edited by LV26 - 2/21/14 at 8:06am
post #4063 of 4111

I used .250A on mine with 110 mains. It will blow if you havent turned the amp on for awhile...I guess the big caps are hungry after sitting...

post #4064 of 4111

Hi

Thank you for the answer.

 

Quote:
 It will blow if you haven`t turned the amp on for awhile

I think you use fast fuse.

I specially choose slow (time lag) fuse.

 

-- Regards,

Victor

post #4065 of 4111

Hello all

I`m starting my Bijou build.

Now waiting for kit from Glass Jar, custom power transformer (Hammond with delivery to Ukraine is very expensive for me), spare tubes, etc.

 

Meantime I`m reading 138 of 271 page of discussion. I not read so much before on forums....

Need lot of beer :)

 

My BIG thanks to all

 

-- Regards,

Victor

 

P.S.

Sorry for my English (English isn`t my native language)


Edited by LV26 - 2/22/14 at 3:47am
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