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Valab NOS DAC - subjective listening and modifications - Page 113

post #1681 of 1987
Quote:
Originally Posted by Wood View Post
Oh that low pass filter is a nightmare, what were they thinking? Glad your getting mojo out of that girl now marcelnl. I think the TX's will go a long way to give you more detail.
Can't wait to get my hands on them....

I am playing with the thought to re-create my 6 step volume switch with those TXs...will be costly but it's now made with crappy metal film resistors......probably is more cost effective to use PRPs or shinkohs or the likes for that purpose. 14*16 USD vs 14*? but if they perform well I just might....
post #1682 of 1987
prp's are 32c each
post #1683 of 1987
Quote:
Originally Posted by Wood View Post
Bad-Gerbil, If you used the 0.47uf caps for coupling, output caps... then this is prob to low, you would lose a lot of bass. Strange then your reporting the opposite,... losing out in the highs? Pic?
Hi,
How do I get more highs, lose bass (and get definition of it),and put forward mids?
Is there any way?
Thanks
post #1684 of 1987
Thread Starter 

last time ...

Quote:
Originally Posted by massivni View Post
Hi,
How do I get more highs, lose bass (and get definition of it),and put forward mids?
Is there any way?
Thanks
post #1685 of 1987

shunt?

Quote:
Originally Posted by marcelnl View Post
Can't wait to get my hands on them....

I am playing with the thought to re-create my 6 step volume switch with those TXs...will be costly but it's now made with crappy metal film resistors......probably is more cost effective to use PRPs or shinkohs or the likes for that purpose. 14*16 USD vs 14*? but if they perform well I just might....
If you shunt the pot you would only need 1 TX
post #1686 of 1987
well it is shunted(if you are talking about having the the ladder between live and ground and the bleed resisistor in the signal path), but I would nevertheless like to have decent Quality resistors throughout the thingy as we are talking AC here and the signal path is important but the ground path is as important in my experience.
But having one TX in line and PRPs in the ladder might be a good compromise.
post #1687 of 1987
Quote:
Originally Posted by massivni View Post
Hi,
How do I get more highs, lose bass (and get definition of it),and put forward mids?
Is there any way?
Thanks
Without knowing your setup a decent answer would be a challenge and almost certainly a random guess, I'm not sure if Pats proposal is the cure all...( a bit like prescribing aspirin without a physical when a patient complaining about a tummy ache in fact has appendicitis)

What did you do to your gear, what gear are you using and why are you looking for this change?
post #1688 of 1987
? what is that? how can I implement this into valab?
post #1689 of 1987
Quote:
Originally Posted by marcelnl View Post
Without knowing your setup a decent answer would be a challenge and almost certainly a random guess, I'm not sure if Pats proposal is the cure all...( a bit like prescribing aspirin without a physical when a patient complaining about a tummy ache in fact has appendicitis)

What did you do to your gear, what gear are you using and why are you looking for this change?
Hi, thanks for reply
The only thing I did to my valab was, input caps changed to russian teflon. Nothing else. I would like to achieve:
-faster, leaner, less heavy bass
-more detailed and more pronounced highs
-forward midrange with more details
My valab is normal version from 2009, I think that is 2.5.
Regards
post #1690 of 1987
Quote:
Originally Posted by PatOMalley View Post
? what is that? how can I implement this into valab?
post #1691 of 1987
Quote:
Originally Posted by PatOMalley View Post
thanks, marcelnl, for the 90 degree tip. I will try that when I mount the CineMags on the chassis.

Both the Chameleon and old VALAB have 47K resistors at output.
But the Tube Buffers works better with the VALAB and the transformers work better with the Chameleon. Same Hagerman Clarinet preamp in play.

There are a few DACs out there that use output transformers. And the deal there should again be correct matching impedance with those transformers going to the preamp .... which is why you may get mixed reviews.

"But the Tube Buffers works better with the VALAB "
Hi,
Interesting information I'm thinking buying the basic Valab $200 on ebay or the Fathom from pacific valve to work with my Maverick TubeMagic as buffer tube, (my poor clone paradisea, jajaaja) welcome suggestions, thanks, Martin,
post #1692 of 1987
Thread Starter 

1:1 600ohm-ers

Quote:
Originally Posted by massivni View Post
? what is that? how can I implement this into valab?
It is a set of steel 1:1 600 ohms transformers from Cinemag.
I set them up on a breadboard with RCAs. Plug the outout from the DAC to them then output from them to the line pre.
post #1693 of 1987
Massivni; it it clear what you want , it is still not clear what sort of equipment you are listening to (it might be your speakers or headphone that are causing the problem, adding a transformer is not going to help in that case)
post #1694 of 1987
Quote:
Originally Posted by PatOMalley View Post
It is a set of steel 1:1 600 ohms transformers from Cinemag.
I set them up on a breadboard with RCAs. Plug the outout from the DAC to them then output from them to the line pre.
Pat, you've convinced me the Cinemags is a worthy effort. I just committed to a set (pending a reply and invoice). I'll hardwire them into the outputs of the Valab instead of using RCAs and additional interconnects. If it turns out to be a bad decision I'll just undo the mod.

I'm not sure Bill Allen is still looking at this thread but I know he's all over the Chameleon thread. Note to Bill and those interested: I've pretty much decided to forgo the Chameleon and probably upgrade my Off Ramp to the new async USB module when it becomes available and maybe swap the Superclock for an Ultraclock to max it out once and for all. Or maybe get one of these...

I've been watching the talk about the dB Audio Labs Tranquility USB DAC. There is quite a buzz for it, making a significant presence for itself at the last RMAF and I mention it here because it would be very interesting to compare its innards to the Valab/Chameleon designs. It's similarly NOS 16/44.1 with every aspect of design and construct given extreme care to maximize its potential. The USB is not async but apparently still serves the DAC very, very well. Unfortunately the actual components have been kept on the down low, even by those who have purchased one.
post #1695 of 1987
Thread Starter 

Newk it

Newk,

I really want to hardwire mine but I have them in a case that I like and don't want to take them out. WTF is wrong with me? I got to get another pair.

Everywhere I put that box it improved things - between my phono pre and line and turned a humble shuffle iPod into an incredible source. Crazy.
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