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Bijou All Tube Futterman Headphone Amplifier - Page 36

post #526 of 3981
5/28/08 at 10:44am
Quote:
Originally Posted by amphead View Post
Regal, thats really fantastic to hear! Is your casework completely finished? If so, how about some pics.

.


Sorry my 2002 digital camera sucks inside (usually have to take things outside to photograph, too lazy today.)


Specs (dedicated to 600 ohm Sextetts) :
Par-Metals Enclosure 12x16x5"
Amp boards - Solens for all caps except output
Output caps: Electrolyitc bypassed w/ KY42
Russian 6922 & 6N6P
NFB Delete

Future upgrade:
Z81 rectifier tube
JJ ECC99's
Amperex 6DJ8 biased to 5 mA
VitQ interstage coupling caps
Obbligato 100uF Output coupling caps

But as it is now its the finest amp I have heard.
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post #527 of 3981
5/28/08 at 11:31am
regal, good to know you like it.
What are you using for C2, cathode bypass cap on the amp boards? Solen ?
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post #528 of 3981
5/28/08 at 11:34am
I forgot about those, they are the Muse Non-Polar Electrolytics. Goal is to find an LED when I bias up to 5 mA.
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post #529 of 3981
5/30/08 at 12:38am
Thats beautiful Regal! The photo quality not withstanding. Looks like the Marantz version of the Bijou. ;-)

Well, I made the cutout for the xformer last night in the top plate. Installing the xformer tonight.
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post #530 of 3981
5/30/08 at 2:44am
Quote:
Originally Posted by amphead View Post
Thats beautiful Regal! The photo quality not withstanding. Looks like the Marantz version of the Bijou. ;-)

Well, I made the cutout for the xformer last night in the top plate. Installing the xformer tonight.
It really DOES look Marantz-like! Good eye!

Regal, nice work...Looks like the silver contender!

Ferrari: your's looks very clean and amazing as well. Those caps look pretty cool! Yow!

Me? Well, I'm working a bit with FPE after making the world-wide search for a case. I have one option left for what I really want in a case, and if that falls through, then I'll move the idea to art on the front panel.
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post #531 of 3981
5/30/08 at 11:44pm
Quote:
Originally Posted by amphead View Post
Thats beautiful Regal! The photo quality not withstanding. Looks like the Marantz version of the Bijou. ;-)
Exactly.
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post #532 of 3981
5/31/08 at 7:58am
Quote:
Originally Posted by bhjazz View Post
...
Ferrari: ...Those caps look pretty cool! Yow!
The look is not my main focus when selecting output caps, however cool looking caps are more than wellcome, to be honest.
I finally end up with ~400µF MKP/Oil after a long trial with many output caps combinations. This value (400µF) also allows using low impedance headphone like AKG K701 (my GF favourite) without bass suffering.

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post #533 of 3981
5/31/08 at 2:55pm
I would like to try some of "premium" caps (Solen, Auricap, MultiCap RTX, Mundorf M-CAP Supreme, Sonicap Gen I, Clarity SA, and DynamiCaps). Do you have any recommendations for C1, C3/4, C6 and C2 (BG?)?
Ferrari what kind of capacitors do you use for c5/6? I have AKG K701.
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post #534 of 3981
5/31/08 at 4:19pm
Quote:
Originally Posted by miky View Post
I would like to try some of "premium" caps (Solen, Auricap, MultiCap RTX, Mundorf M-CAP Supreme, Sonicap Gen I, Clarity SA, and DynamiCaps). Do you have any recommendations for C1, C3/4, C6 and C2 (BG?)?
Ferrari what kind of capacitors do you use for c5/6? I have AKG K701.
That's going to kill your wallet mate.

To be honest, I don't know all the caps from your list, only Solen, Auricap, DynamiCaps and Mundorf M-CAP Supreme are well known by me. I don't regard Solen MKP as "premium" cap. It's a step up from ordinary Wima, BC... MKP at a very reasonable price but nothing special. Auricap and DynamiCaps are clearly a bigger step up and are worth to try, you can't go much wrong with these caps.

My preference is Mundorf Silver/Oil, an excellent all-rounder to my ears. The only downturn is (may be) the price, but if you can afford it, you should give it a try. For C2, you can use BG NX but it should be tough to get it fit the board.
Note that this is my personal experiences/opinions, other people might have totally different opinions.

Personally, I use Audyn MKP for C1 and C5 (I need much capacitance at these positions) and Obbligato MKP/Oil for C6. These are simply the caps I accidentally have on hand.
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post #535 of 3981
6/1/08 at 4:42am
Thank you!
Quote:
That's going to kill your wallet mate.
I don’t mean to try all of them.
What you say about Russian PIO/Teflon (K42Y-2, FT-2 etc.)?

Does someone have some experience with Sonicap Gen I?
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post #536 of 3981
6/1/08 at 5:51am
Russian PIO? It depends on which type you are talking about.

K42Y-2 PIO (metalized paper in oil) is overhyped in an other thread here at HF, very cheap and widely available on eBay.
To my ears it's nothing special, surely not a capacitor that I would put in my amp. Yes, it pumps the bass up (good for bass head), but the remaining audio band sounds quite dirty, poisoned mid-range and highs. Details and resolulions are really disappointed.
Alcheapo K42Y-2 PIO is clearly a big step down from K40Y-9 PIO.

K40Y-9 (metal foil + paper in oil) is a different story. The sound is much more neutral and smooth. (not that dirty, poisoned sound of K42Y-2). Considering the price, it's a good bargain for audio applications.

About Russian FT3 and K72 Teflon caps? I have posted my opinions about these caps here.
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post #537 of 3981
6/1/08 at 5:58am
Ferrari, what do you think of the big 100uF motor run oil can capacitors like you see on ebay (some are sprague.) I only need 100 uF with my 600 ohm phones and am tempted to try these.
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post #538 of 3981
6/1/08 at 6:15am
Quote:
Originally Posted by regal View Post
Ferrari, what do you think of the big 100uF motor run oil can capacitors like you see on ebay (some are sprague.) I only need 100 uF with my 600 ohm phones and am tempted to try these.
Personally, I have not tried motor run oil capacitors yet, so I can't comment on this.
From what I read at diyAudio.com, tubes lovers seems to like motor run oil capacitors very much.
If I can remember, n_maher (a HF member) has put 200uF motor run oil capacitors in his amp, so I think that he can help you.
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post #539 of 3981
6/1/08 at 5:58pm
Quote:
Originally Posted by Ferrari View Post
The look is not my main focus when selecting output caps, however cool looking caps are more than wellcome, to be honest.
I agree. It's just that they were so...BIG!
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post #540 of 3981
6/2/08 at 3:44pm
Quote:
Originally Posted by bhjazz View Post
I agree. It's just that they were so...BIG!
Those 330µF polypropylene caps are initially intended to use in speakers filters (speakers builds is my other hobby for years).
Yes, they are BIG for an tube amp... but as long as they are sounding BIG too, then that is no problem at all for an DIY audio nut like me. I will find a way to make them fit.
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