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post #331 of 1989

The hum is caused by the windings vibrating.  Power cords won't fix that, unfortunately.

 

Quote:
Originally Posted by ginetto61 View Post

i would not put a transformer on the pcb by the way. 

A separate box with a good umbilical it is a common solution as the amp is not portable so one more little box is a non issue.

All transformers have vibration.

Is a power cord without ground effective in taming the noise/hum ?

Thanks and regards,

gino

post #332 of 1989
Quote:
Originally Posted by Pappas3278 View Post

I would have to vehemently disagree with the A2 and "high noise floor" in Low Gain mode with low impedance phones. 

 

I use Grado RS1's and the A2 is absolutely dead quite.  My source player is rated at -115dB signal-to-noise and my preamp that is chained to the A2 is rated at -97dB (not excellent).  I have an A2 with the transformer hum and it is still...you guessed it -- dead quite.

 

My A2 also has the mechanical transformer hum issue, but the headphone output in low gain mode is very quiet.  No appreciable noise to be heard with my SR60i or HD598.

 

High gain mode, on the other hand, is a different story.  With either of the aforementioned headphones, there's a pretty good amount of background noise.  I can still hear a little bit of background noise on my K702 65th Anniversary.  With my 600-ohm DT880, I don't hear any noise.

 

Ultimately, this works just fine for me.  The A2 is able to swing plenty of power in the low gain mode to drive my SR60i, HD598, and K702.65.  I only ever flip it up to the high gain mode with my DT880/600.  No noise floor to be heard with any of those setups.

 

A couple interesting things to note from Schiit's website:

 

  • SNR: More than 102db, unweighted, referenced to 1V RMS, in low gain mode
  • Topology: Fully discrete, single-ended Class A with single voltage gain stage, no overall feedback in high gain mode, 12dB feedback in low gain mode

 

The SNR figure is given for the low gain mode, indicating that this is presumably the better of the two modes in that regard.  I could be wrong, but I suspect the better SNR figure is achieved due to the 12dB of feedback they used in the low gain mode.

post #333 of 1989

102db, unweighted is not a bad S/N ratio to have. Part of the reason you are getting mechanical transformer hum is that since the amp is class A the transformer drawing quite a bit of current even at idle. So in class A amps you have to over-engineer the power supply more than class A/B so that you do not get hum or buzz at idle.

post #334 of 1989

I'm expecting the next batch of A2s to have all the problems sorted out.  I think it got rushed out the door the first time to keep customers happy.

post #335 of 1989

Sorry if this is a dumb question, but what voltage should I choose for driving my LCD-2's or does it even matter?

post #336 of 1989
Quote:
Originally Posted by benk97 View Post

Sorry if this is a dumb question, but what voltage should I choose for driving my LCD-2's or does it even matter?

 

set gain to high unless you are fine with low gain

post #337 of 1989

An ortho like the lcd2 will need high gain on the A2 to sound it's best. 

post #338 of 1989

Just checked the site, today 4/8, and for the Asgard 2 it still says

 

"STATUS: In production. Backorders will start shipping the week of 4/1

and orders placed now are expected to ship in 5-7 business days."

 

 

Maybe I'll just go for a Valhalla.

post #339 of 1989

For which headphones?  The Valhalla is best suited for high impedance headphones (> 250 ohms).

 

Quote:
Originally Posted by zazex View Post

Just checked the site, today 4/8, and for the Asgard 2 it still says

 

"STATUS: In production. Backorders will start shipping the week of 4/1

and orders placed now are expected to ship in 5-7 business days."

 

 

Maybe I'll just go for a Valhalla.

post #340 of 1989

I was pretty hopeful about getting mine last week according to my revised backorder date and "in production" status on the web site, but my order fulfillment date got bumped back another week. This and the drama surrounding my Meridian Explorer has left me pretty discouraged about early adoption of desktop audio products. I'm actually burning through the 30-day trial period on my Airmotiv 4s waiting for this amp. As I posted earlier, though, I can't come up with a superior alternative, and I can live with these first-world problems in the meantime. 

post #341 of 1989
Quote:
Originally Posted by hodgjy View Post

For which headphones?  The Valhalla is best suited for high impedance headphones (> 250 ohms).

 

 

Thanks for that input.

 

I want to use it for a variety of headphones; AKG 702's, Sony MDR 7520's,

and others.  ('My Profile' has a list.)

 

But I'm not sure how much better the Valhalla will sound than my Asgard 1

across the board.

 

IMO they're not handling the Asgard 2 situation as well as they could be -

but ultimately, I think, they'll fully sort things out.  When they do, I'd really

like to buy one (an A2).

post #342 of 1989

I just ordered the Asgard 2 to power my LCD-2's pretty excited! I also bought a Modi and was wondering if they came with a usb cable or will I have to buy the PYST cable.

post #343 of 1989
Quote:
Originally Posted by benk97 View Post

I just ordered the Asgard 2 to power my LCD-2's pretty excited! I also bought a Modi and was wondering if they came with a usb cable or will I have to buy the PYST cable.

You need to get both, peace
post #344 of 1989

Hmm...thats disappointing. 

post #345 of 1989

Just to make sure the USB I need is a type A Male to type B Male right?

 

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