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Bijou All Tube Futterman Headphone Amplifier - Page 2

post #16 of 3976
12/21/07 at 5:46pm
Thread Starter 
My mistake , I recall it being more expensive , it's these cysts in my brain!!

"270DAX 75VA, sec. 260-0-260 @ DC ma 90, 6.3V @ 3.5A, upright mounting, bell ended EACH $40.99."

..dB

shipping was ~ $15 ( I was thinking $50 +$15 )
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post #17 of 3976
12/21/07 at 6:42pm
Quote:
Originally Posted by ericj View Post
The other problem for me is enclosures. I've got a few completed amps waiting for enclosures at the moment.
I desperately try to avoid having uncased projects, however tempting. That's probably why I take so long to complete projects: I expect them to be operational, cased, and ready for a meet at moment's notice! For the next projects, I will try to simplify the cases: less lighting effects, more audio, then MOVE ON TO THE NEXT ONE!!!!!!!

Anyway, for $21 and ~$200, I'm definitely IN for this one.

ahhhhh....tubes.........
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post #18 of 3976
12/21/07 at 7:04pm
Thread Starter 
speaking of uncased.......
LL
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post #19 of 3976
12/21/07 at 8:28pm
Hello gents. Just signing in so I can get the emails. I think this will be the Bijou support thread on HeadFi. Thanks Don for starting it.
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post #20 of 3976
12/21/07 at 8:46pm
Quote:
Originally Posted by runeight View Post
Hello gents. Just signing in so I can get the emails. I think this will be the Bijou support thread on HeadFi. Thanks Don for starting it.
I'm in for the three boards. Like I mentioned earlier, I can't log-in to my headwize account. Thanks for having my back Vixr! Runeight has me on his list now, Right? ;-) One question, you probably has this info listed, but are the tubes self-biasing or is there a biasing link? Thanks
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post #21 of 3976
12/21/07 at 9:34pm
Quote:
Originally Posted by dBel84 View Post
speaking of uncased.......
Foam under the transformer, eh? Reminds me of a Bottlehead forum thread...
Those bell ends are itchin' for some polishin'.....
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post #22 of 3976
12/21/07 at 10:45pm
Quote:
Originally Posted by dBel84 View Post
My mistake , I recall it being more expensive , it's these cysts in my brain!!

"270DAX 75VA, sec. 260-0-260 @ DC ma 90, 6.3V @ 3.5A, upright mounting, bell ended EACH $40.99."

..dB

shipping was ~ $15 ( I was thinking $50 +$15 )
Someone should have a go at building the amp with the 370DAX. The voltage specs are exactly the same but the 370 is a lot more robustly designed. I've heard from multiple sources, and heard it myself, that over time the 200 series trafos have a habit of getting noisy, running hot, etc. I know that when I replaced the 200 series trafo in my Wheatfield with the equivalent 300 series the operating temp went down a good 20 degrees and the 300 was silent compared the rather buzzy 200.

Just my 2c, and yeah, I'm in for a pair of boards or maybe more...

Nate
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post #23 of 3976
12/21/07 at 11:03pm
I am in for the boards, but not sure if I build it soon or not. And, Yes, I am one of the Team cheap bastard, and the Team Nude Amp FTW.
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post #24 of 3976
12/21/07 at 11:10pm
Quote:
Originally Posted by amphead View Post
I'm in for the three boards. Like I mentioned earlier, I can't log-in to my headwize account. Thanks for having my back Vixr! Runeight has me on his list now, Right? ;-) One question, you probably has this info listed, but are the tubes self-biasing or is there a biasing link? Thanks
Amphead, yes I'm on this thread now.

The power supply has a trimpot to set to 250V. Other than this, everything is self biasing. Even if you tube roll.
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post #25 of 3976
12/21/07 at 11:46pm
Quote:
370HAX
What?

Hammond Mfg. - Universal Primary - "Classic" Power Transformer
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post #26 of 3976
12/22/07 at 12:02am
Quote:
Originally Posted by MisterX View Post
Sorry, transposed a letter wrong, it is of course the 370DAX. The trafo for my Wheatfield was a 370H so that's always the first part number that pops into my head...
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post #27 of 3976
12/22/07 at 12:08am
Ok, figured it was a typo but do you see the other "problem"?
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post #28 of 3976
12/22/07 at 12:30am
Quote:
Originally Posted by MisterX View Post
Ok, figured it was a typo but do you see the other "problem"?
Nope. My understand was that between the 2 and 3 series there weren't any differences other than the universal primary specification and that the 3 series weren't built with "economy" in mind. So what's up? Or did I just screw something else up in my post that I'm too tired to find right now?
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post #29 of 3976
12/22/07 at 1:39am
270DAX:
Quote:
6.3 V@3.5 A
370DAX:
Quote:
6.3V C.T. @ 3.5A
the "Filament" winding on the 300 series has a center tap.
And.
the 300 series also has a "bias tap"
I realize those extra wires are non issues to experienced builders but I think both of us have been around here long enough to know that even if you explain it 14 times somewhere, someday, somebody is going to try to hook those extra wires up to the wrong spot.
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post #30 of 3976
12/22/07 at 1:52am
Quote:
Originally Posted by MisterX View Post
the "Filament" winding on the 300 series has a center tap.
And.
the 300 series also has a "bias tap"
Good points, it certainly makes sense to have the 270 be the default and it's probably fine if the amp doesn't run hot. No doubt it's a lot easier to work with. But if someone was going all out the 370 would be worth considering in my book.
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