Man, some people like to make things even more expensive...
Around here they come at 0.20$ a piece, now you wanna tell me that's expensive for a big stainless washer in small quantities ?
An even cheaper solution, and made of aluminum, was made by Lithuania back in 91', but those you need to drill the holes in yourself.
I bought myself a nice stock of those, as they make good quality washers in 3 different sizes (see pic).
And dear friends, do take note of the much improved quality of the photo
Magura and Magura got themselves a new camera. Bought a real cheap and simple one, which they're able to manage
Magura
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I'm playing with a super cheap input transformer on an differential source follower amp. I'm just stunned at the quality of sound I'm getting with such a simple input. The transformer gives the amp a gain of 4 (or so).
I've been in contact with Jensen Transformer and will be ordering a pair of their line stage 1 to 4 ratio transformers (listed as 4 to 1 but connected to my amp in reverse) for a greater attempt at audio nirvana.
This is such a simple experiment and one that paid off handsomely.
I've been in contact with Jensen Transformer and will be ordering a pair of their line stage 1 to 4 ratio transformers (listed as 4 to 1 but connected to my amp in reverse) for a greater attempt at audio nirvana.
This is such a simple experiment and one that paid off handsomely.
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Hey Carpenter,
Did you see this?
http://www.diyaudio.com/forums/tube...ormer-voltage-gain-element-4.html#post1914642.
Looney
Just read those three posts. Thanks. I'll take a peek at that transformer.
I'm listening to Alanis Morissette and honestly can't believe how pretty this transformer arrangement sounds. I spent a year developing a two stage pre to drive this source follower and now it's all been undone by a simple transformer...cheesh ???!!!???
I'm glad that you realized distinction between balanced and symmetric , when using xformer 
regarding sound ..... now you hear why I'm using xformer in stages after DAC's - great sense of continuum
( beat that explanation , if you can
)
and stunning dynamics and details , when impedances matched properly ;
regarding that - make sweep test ( varying from 20-20K ) and alter R2 and R4 to acheve flattest response
regarding sound ..... now you hear why I'm using xformer in stages after DAC's - great sense of continuum
( beat that explanation , if you can
)and stunning dynamics and details , when impedances matched properly ;
regarding that - make sweep test ( varying from 20-20K ) and alter R2 and R4 to acheve flattest response
I'm glad that you realized distinction between balanced and symmetric , when using xformer
regarding sound ..... now you hear why I'm using xformer in stages after DAC's - great sense of continuum
( beat that explanation , if you can
and stunning dynamics and details , when impedances matched properly ;
regarding that - make sweep test ( varying from 20-20K ) and alter R2 and R4 to acheve flattest response
I've been in love with inductors ever since Nelson introduced us to ZV7-T. Of course, you know that, Choky. I've never forgotten to use the power inductor--but, using an input transformer, this is a first for me. Now, it seems like I'm going to stay here for a long while. I like the way the music sounds--quite lively. When you think of the cost to build a preamp, not to mention time, which I have less as the sands fall through life's hour-glass, it seems a logical path to journey. Good grief, this is fun.
I've been toying around with R2 and R4. The tech at Jensen Transformer suggested a load no greater than 1/10 of the transformer's output impedance. In the case of the little Xicon, the output impedance is 50,000 ohms, so 10 x 50,000 is 1/2 meg. I had 1 meg resistors on hand, so that's the route I went. I'll try to get a little closer to his suggestion. The sound seems pretty smooth, better than with the 10k resistors I began with. In fact, there's just no way this amp should sound good with such a cheap input transformer. I'm still scratching my head over that one.
.....I'm still scratching my head over that one.
me too
look Ma' - with no hands ..... (boom! )
penultimate version
playing with SS ...... soon I'll try SS version od Magura/ZM Donut - choked , not cascoded
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pretty board... (actually, I'm pretty excited
this one is top secret ........
SS Donut will be in public domain ..... Copyleft by ZM
improved ( almost finished version of top secret one ) :
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sorry - I wasn't awake last few days
whatever I find , whenever I need
last was purchase from German e-pay , few pairs of small Beyerdynamic 1:7 and 1:10 xfromers , which I melted in Primare CD31 , for passive I/v conversion
ditto - no nasty passive resistor on DAC output , then xforming that voltage , but proper clean primary to differential PCM1704 ( pair , what else ) , then loading secondary 'till I get sweet spot , where transfer is linear from 20-20
funny thread is on Baby Diya ;
today's news is SUSY stage after xformer - to drive nasty PSM LS (optical volume) load .
next one is trying Babelfish UGS buffered stage , even if I'm not sure that present ( Juma's) simple diff. SUSY can be beaten in that place .
stage beaten , not Juma
anyway - while I'm at keyboard - can anyone point me in right direction for more info about this Diamond ( I can't find it ......I remember that I saw it here , as sort of predecessor to Papa's SUSY ........ hitachi .... or someone else ? ) :
( edit : Jaccovitty is my hope - having memory as Elephant
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naah - found it ;
AES E-Library: Fully Balanced Bridge Amplifier
AES E-Library: Fully Balanced Bridge Amplifier
anyone willing to smurgle that pdf to Mighty ZM ....... ?
I'm going to search patents in a meantime ......
edit:
zeronadanone searching patents on line
AES E-Library: Fully Balanced Bridge Amplifier
AES E-Library: Fully Balanced Bridge Amplifier
anyone willing to smurgle that pdf to Mighty ZM ....... ?
I'm going to search patents in a meantime ......
edit:
zeronadanone searching patents on line
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