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Bijou All Tube Futterman Headphone Amplifier - Page 272

post #4066 of 4182

Hi

 

What about using guitar/instrumentation cables for IN and OUT wiring (I have some Sommers SC-SPIRIT XXL)?

Or twisted wires better?

I decide place IN (RCA) and OUT (1/4") at rear panel for aesthetics "look and feel".

Black steel case (closed style, all inside) with walnut left and right panels. Only Volume, NFB and power LED on front.

So input wiring can be relatively long.

I`ll be glad to read yours comments.

 

-- Regards,

Victor

 

P.S.

I can show my board`s placement idea at monday.


Edited by LV26 - 2/23/14 at 2:04am
post #4067 of 4182

Victor, 

 

You wiring will be fine, but you will want to run pairs of that single-strand wire from one location to the other, so just twist two together.  That will help reduce crosstalk and induction.  

 

And don't worry about your English - it's just fine!  

 

Brian

post #4068 of 4182
Quote:
Originally Posted by bhjazz View Post

...

 

You wiring will be fine, but you will want to run pairs of that single-strand wire from one location to the other, so just twist two together.  That will help reduce crosstalk and induction.  

 

...

 

Brian


Hello,

Thank you for the answer.

I would like to notice that I`m going to use shielded (coax) cable for signal wiring (RCA --> ALPS --> PCB, PCB --> 1/4" Headphone Con.).

 

SOMMER CABLE - SC-SPIRIT XXL

http://sommercable.com/2__produkte/2__030_meterware/2__300_0071.html

 

IMO coax provide better shielding than twisted pair. (I`m electronics engineer, but design digital devices)

But probably some voodoo stuff there in Analog World..... ;)

Am I correct? I`m about shielding, not magic ;)

 

-- Regards,

Victor


Edited by LV26 - 2/23/14 at 3:11pm
post #4069 of 4182
Quote:
Originally Posted by LV26 View Post
 


Hello,

Thank you for the answer.

I would like to notice that I`m going to use shielded (coax) cable for signal wiring (RCA --> ALPS --> PCB, PCB --> 1/4" Headphone Con.).

 

SOMMER CABLE - SC-SPIRIT XXL

http://sommercable.com/2__produkte/2__030_meterware/2__300_0071.html

 

IMO coax provide better shielding than twisted pair. (I`m electronics engineer, but design digital devices)

But probably some voodoo stuff there in Analog World..... ;)

Am I correct? I`m about shielding, not magic ;)

 

-- Regards,

Victor

 

:)

 

I really like your comment: I'm about shielding, not magic!  That was great!

 

OK, I see what you are saying.  I did not look hard enough at the description of the cable.  You should be fine with that cable.  

post #4070 of 4182

Hi

 

Thanks Bhjazz

Sometimes I`m ironic. :smile_phones:

 

My preliminary placement. (Only B+ and Heater wiring shown)

 

 

-- Regards,

Victor

 

P.S.

Just arrived 6x 6N6P (NOS, 1978 year, Made in USSR)

Need some work with ink eraser for cleaning pins.

 

P.P.S.

What Vishay/Roederstein capacitors better - MKT1822, MKP1839 or MKT1813?

I read that `1813 very good for audio application... Better than WIMA.

Is this true? What you can recommend?

 

P.P.P.S

Sorry I`m not correct (I must indicate WIMA part number).

Really,  WIMA MKP 10 have the best tantan.gif comparing VISHAY part`s listed above.


Edited by LV26 - 2/28/14 at 11:33am
post #4071 of 4182

Victor, 

 

In your reading of this thread, you'll find some information about noise that might come from the transformer.  Keep this in mind when designing your layout.  I don't think this particular transformer is much of a problem, though, so you should be fine with your current layout.  Just make sure you leave enough room for the output wiring, and also draw in where you want your headphone output on the front panel so you don't forget it!

 

I don't know a lot about the MKT1813, so it is difficult to help you with that.  They don't appear to be available here in the US.  I have heard that the MKT1822 is quite nice.  I think Google will have to help you!

 

When you get to wiring the tube sockets for your 6N6P tubes, just make sure you look at the correct diagram on the Cavalli Audio website.  There are different schematics for 6N6P (ECC99) and 6N6Pi tubes.  We don't want you to blow anything up!

 

Have fun!


Brian

post #4072 of 4182

Hi,

Yeah, I study all Cavalli web and read ALL thread from post #1 :)

It was really hard pleasure (but pleasure :))

 

Thank you for precautions!

 

-- Regards,

Victor

 

P.S.

 

Quote:
 ... Just make sure you leave enough room for the output wiring, and also draw in where you want your headphone output on the front panel so you don't forget it!...

Output (1/4" Neutrik) will be placed on Rear. Yes... on rear :rolleyes:

Only Volume + NFB + Power Led on front.

Quote:
 
 ...There are different schematics for 6N6P (ECC99) and 6N6Pi tubes....

Not sure ... I think "There are different schematics for ECC99 and 6N6P (6N6PI) tubes" is correct.

Because different heater pinout/wiring.


Edited by LV26 - 2/26/14 at 6:17am
post #4073 of 4182

Hello,

I have possibilities to buy some tubes for V1 rolling.

Any positive info about using this tubes with Bijou?

 

1) E88CC Tesla GOLD pins
2) E88CC Tungsram
3) E88CC Philips GOLD pins
4) E88CC Telefunken GOLD pins
5) 6DJ8 Sylvania Military JAN
6) PCC88 Tungsram (not sure - need 7V heater voltage)

 

-- Regards,

Victor

 

P.S.

From Regal's Mods

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

"Regal's mods requires using ECC99s (not 6N6Ps) and the EZ81 Power Supply."

 

Sorry, I can`t understand why 6N6P tube can`t be used with Regal`s Mod.


Edited by LV26 - 2/26/14 at 6:25am
post #4074 of 4182

I believe the 6N6P and ECC99 are closely related, but have different heaters, although...don't they have the same pinouts?  I will have to look in to this tonight at home!  Wait - I just saw this on the cavalliaudio site:

 

"The ECC99 is based on the Russian 6N6Pi. The tubes are similar except that the 6N6Pi has sligtly lower plate resistance (higher current for a given operating point) and ECC99 uses pins 4,5 and 9 for its heater while the 6N6Pi uses only 4 and 5. Nevertheless, these tubes are close enough in performance to substitute the 6N6Pi for the ECC99. The Bijou amplifier board is equipped with configurable heater connections for the ECC99 socket so that 6N6Pi can be used."

 

So I was actually pretty close.  Yay!

 

Anyway, back on that site, I just wanted to point out that there is different wiring for the ECC99 and 6N6Pi even though I suggested otherwise.  

https://www.cavalliaudio.com/diy/bijou/main.php?page=wiring 

 

Be safe!!

post #4075 of 4182

Hello,

My custom-made power transformer arrived today... 20 Eu only :cool:

 

Intel(R) IPP JPEG encoder [7.0.1041] - Jul 19 2011;

 

 

Some tech. info

 

OD: 115 mm.

ID: 40 mm.

H: 40 mm.

 

~ 80 VA nom.

Primary: 220 VAC

Secondary_1: 260 VAC 0.1 A (used AWG 28 equivalent)

Secondary_2: 260 VAC 0.1 A (used AWG 28 equivalent)

Secondary_3: 6.3 VAC 4.0 A (used AWG 17 equivalent)

Electrostatic Shield

 

Some test measurements:

DCR(pri) = 16.21 R
DCR(sec1) = 34.764 R
DCR(sec2) = 33.564 R
DCR(sec3) = 0.07 R

 

I will test under load later. (It is necessary to find appropriate resistors)

Bingo! :wink_face:

Will use light bulb`s for 260 V testing (20-25W, 220V rated - two in series)

 

To be continued....

 

-- Regards,

Victor


Edited by LV26 - 2/28/14 at 3:42am
post #4076 of 4182

Wow, custom transformer.  Cool!  Great price as well.  Good job!  How did the load testing go?

post #4077 of 4182

Hello,

Thank you for the answer.

Testing under full load not performed at this moment.

I have some life outside Bijou (work, family, kids, etc.) ;)

I hope I`ll have some time at Monday....

 

-- Regards,

Victor

 

P.S.

I purchase two NOS (from spare part kit from old medical equipment) TUNGSRAM E88CC for tube rolling.

It is interesting to me to compare with modern JJ ECC88.

 

P.P.S.

I use GRADO SR80i and I really like this HF.

And today I findout that Bijou is not best choice for GRADO`s.

I am a little bit afflicted that SR80i and Bijou are not "best friends".:(

But I will continue with my Bijou in any case. I promise. :bigsmile_face:

post #4078 of 4182

Victor, no, Grados do not seem to be a great match for this amp.  I just noticed that they were listed in your profile.  You may be able to adjust the feedback a bit to coax some better sound out of them, but this does seem to have better synergy with high impedance phones.  Might be time to consider the HD650!  

 

Also to note: I built a Cavalli Kan Kumisa III amp a few years back and it seems to do really well balancing between high and low impedance phones.  Maybe you could build that one once your Bijou is complete.  (Yes, I know, DIY is an endless journey)

 

Cheers!

 

Brian

post #4079 of 4182
Quote:

 

P.P.S.

I use GRADO SR80i and I really like this HF.

And today I findout that Bijou is not best choice for GRADO`s.

I am a little bit afflicted that SR80i and Bijou are not "best friends".:(

I had the exact same realization :D Went and bought some Beyerdynamic phones right after.

post #4080 of 4182

Hello,

Yes, Bijou should be much better with Hi-Z Headphones...

But I read good response about Grados+Bijou

Quote:
 
I didnt like lowZ phones with the bijou, Purely personal taste but the magic with phones such as the hd650 or the high z Beyers just seemed to go when i tried grados and akg k701. To be honest i was pretty repulsed by the grado bijou combo! However, it is my amp of choice with the senns, really nice sound.

// post #3445

http://www.head-fi.org/t/277541/bijou-all-tube-futterman-headphone-amplifier/3435

 

But I think to start collecting money for HIZ Headphones (HD-650 or other with open cans) :wink_face:

(I hope that my wife is not reading this forum. :atsmile:)

 

-- WBR

Victor


Edited by LV26 - 3/2/14 at 2:28pm
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