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The Counterpoint I/V analog stage - Page 2

post #16 of 26
10/1/09 at 5:21pm
Quote:
Originally Posted by regal View Post
I hate the sound of audio transformers so thats out of the question (they are never transperent.)
I'm curious. What specific audio transformers have you used that you've hated the sound of?

Thanks.

k
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post #17 of 26
10/1/09 at 5:33pm
Quote:
Originally Posted by fran View Post
All of the above with usual disclaimer of in my system YMMV


Fran
I'll take your word for it.
Did you build on breadboard or a pcb from TP during beta testing?
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post #18 of 26
10/2/09 at 1:05pm
Twisted Pear has something coming out called the Ventus which is a 'mostly discrete' opamp/balance-to-SE converter. Only IC is LME49600, a new audio buffer from National.

I'll be picking one up for my in-progress Buffalo.
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post #19 of 26
10/2/09 at 2:06pm
Quote:
Originally Posted by MoodySteve View Post
I'll be picking one up for my in-progress Buffalo.
Considering it is mono, I think you'll want to grab two......
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post #20 of 26
10/2/09 at 8:48pm
Hi digger945 - hows that aikido going!?

I got some boards from TP and stuffed them myself. Fairly large jump - and well worth it. They draw a good bit of current, so I had to modify the LCBPS a bit cause it was running out of steam. They also run pretty hot: The cases on my transistors get to 55-60 deg C. Yikes!!

Sound great though and well worth the build. Its a pity they didn;t do that buffalo 32 without the onboard IVY.

Fran
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post #21 of 26
10/2/09 at 9:04pm
24V Aikido is loaned to a friend, and I think I may have a hard time getting it back LOL!!!

Say they like more juice eh. Guess the new Placid is out then as I doubt it would be up to the job(don't know how much current the Placid is good for actually).

Thanks for the info, much appreciated.


EDIT: Just took a peek at the Placid user's manual and it looks like the default config will give up about 200mA and can be tweaked to over 500mA. That's about the most I've seen from a small low volt shunt lately.
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post #22 of 26
10/2/09 at 10:40pm
Quote:
Originally Posted by digger945 View Post
it looks like the default config will give up about 200mA and can be tweaked to over 500mA
That's just one possible setting. Varying the current is just a matter of turning the trimmer. Depending on the drop, you can theoretically go up to 1A or so, but it will be toasty.
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post #23 of 26
10/8/09 at 11:46am
Thread Starter 
Quote:
Originally Posted by Koyaan I. Sqatsi View Post
I'm curious. What specific audio transformers have you used that you've hated the sound of?

Thanks.

k
Ones I could afford !

I understand that if you have the bucks a transformer can be transperant but I have found that transistors typically do a better job for the dollars if you find the right circuit.
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post #24 of 26
10/8/09 at 12:07pm
Quote:
Originally Posted by regal View Post
Ones I could afford !

I understand that if you have the bucks a transformer can be transperant but I have found that transistors typically do a better job for the dollars if you find the right circuit.
I understand.

I'm just trying to put your comment into some sort of context is all.

You said "I hate the sound of audio transformers so thats out of the question (they are never transperent)."

So what are we talking about here? "Ones I could afford" doesn't tell me anything. Are we talking about $5 transformers from Edcor, or are we talking about something else?

se

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post #25 of 26
10/10/09 at 4:40am
Thread Starter 
Oh I see, I've experiemented with transformers to lower the I/V resistor on a DAC. The step up transformers I tried were made by Cinemag, I blew about $150 on them and they sounded terrible. I am sure the more expensive Sowter or Lundal transformers sound fine though.

I've also experimented with tranformers for SET head amps, and none sound as good as Runelights Stacker II which basically uses transistors to replace the iron. Thats when I made up my mind that I would seek methods that avoid transformers in the audio signal. Just an opinion and I could be dead wrong. But this is just a hobby and I like to keep it fun (expensive transformers kill the joy
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post #26 of 26
10/10/09 at 4:58am
Quote:
Originally Posted by regal View Post
The step up transformers I tried were made by Cinemag, I blew about $150 on them and they sounded terrible.
Probably more to do with a mismatch of some sort. But, there is no requirement to use them, so if they aren't fun, don't
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