[michaelkeeney]

Which version you have? Reg or r

Reg. I'm all cd and vinyl, so the whole usb doesn't really matter.

 

[scalpel]

No more DACT CT2 balanced stereo stepped attenuator on WA22 produced lately? This is the WA22 I received 2 weeks ago.
 

 

[Stereolab42]

  No more DACT CT2 balanced stereo stepped attenuator on WA22 produced lately? This is the WA22 I received 2 weeks ago.

 
Great news, that was one of the things holding back the WA22. It makes no sense to use a stepped attenuator with balanced inputs because stray DC that would otherwise be cancelled out causes noise during steps.

 

[abvolt]

That's good to know Stereolab42 since I've also only owned my wa22 for about 5 weeks, I get no noise whatsoever cool thanks..

 

[dahan]

  No more DACT CT2 balanced stereo stepped attenuator on WA22 produced lately? This is the WA22 I received 2 weeks ago.
 
 

I wish my WA22 didn't come with the stepped attenuator. Sometimes it's hard to hit the sweet spot with stepped attenuator.

 

[2359glenn]

 

  No more DACT CT2 balanced stereo stepped attenuator on WA22 produced lately? This is the WA22 I received 2 weeks ago.

 
Great news, that was one of the things holding back the WA22. It makes no sense to use a stepped attenuator with balanced inputs because stray DC that would otherwise be cancelled out causes noise during steps.

Were is the stray DC coming from the DAC??

 

[Stereolab42]

 
Were is the stray DC coming from the DAC??

 
Yup. They explain it with "It is possible however to see more significant DC offset with reference to ground. Different DAC chips produce different offset." Completely harmeless normally because it gets cancelled out when one signal gets inverted and added to the other, but with the volume control operating on the signals before that stage, you get noise as the DC is cut in and cut out between steps.

 

[2359glenn]

 

 
Were is the stray DC coming from the DAC??

 
Yup. They explain it with "It is possible however to see more significant DC offset with reference to ground. Different DAC chips produce different offset." Completely harmeless normally because it gets cancelled out when one signal gets inverted and added to the other, but with the volume control operating on the signals before that stage, you get noise as the DC is cut in and cut out between steps.

DC offset is completely unacceptable what if it was plugged into a direct coupled SS amp. It would amplify
the DC and blow the speakers.
If DAC manufacture cant design a circuit without DC offset they should have output capacitors to block the DC.   
The amp manufacture has to change there product to compensate for poor design on the part of the DAC company's What.  

 

[Stereolab42]

 
DC offset is completely unacceptable what if it was plugged into a direct coupled SS amp. It would amplify
the DC and blow the speakers.
If DAC manufacture cant design a circuit without DC offset they should have output capacitors to block the DC.   
The amp manufacture has to change there product to compensate for poor design on the part of the DAC company's What.  

 
It's only on the balanced outputs and only on hot wire wrt ground and cold wire wrt ground, so therefore shouldn't the DC cancel out (just like any other noise) during the inversion and addition process (which is before amplification)?

 

[3083joe]

Quick listen tonight
596 rectifier - excellent (slightly warm/muddy)
6f8g nu - seem muddy w/596 combo
6f8g ts - smooth more refined airy w/596 combo
6sn7 nu - even smoother. Detail upon detail. Feel like I'm in the room with bad as they are recording. Hear chairs squeaking and all. W/596 combo.
Brimar 5z4g will be here tomorrow.(hopefully) Look forward to trying it with the same drivers.
Have a great evening.

 

[joseph69]

596 rectifier - excellent (slightly warm/muddy)
6f8g nu - seem muddy w/596 combo

???

 

[3083joe]

???

The combo for me is very very warm. Missing in detail.
The ts with the 596 is sublime. Love it.

 

[2359glenn]

 

 
Were is the stray DC coming from the DAC??

 
Yup. They explain it with "It is possible however to see more significant DC offset with reference to ground. Different DAC chips produce different offset." Completely harmeless normally because it gets cancelled out when one signal gets inverted and added to the other, but with the volume control operating on the signals before that stage, you get noise as the DC is cut in and cut out between steps.

The DC offset is not going to get through the coupling caps that are blocking DC anyway. And defiantly not getting through the output transformers.
This can screw up the bias on the 6SN7. It just not supposed to be there don't know how DAC company's think this is acceptable.  

 

[isquirrel]

Office WA5-LE  (upgraded) has arrived. Yes, that's a 5/8" bike lock in the background (and not the only security protecting this baby, not by a long shot... if you can steal this and get away with it you deserve it.) I guess I'm keeping the WA6-SE it replaces as a backup for now; it's a great amp for the price, but doesn't hold a candle to 300B.

Nice, are those RCA black glass I can see?

 

[musicman59]

Quick listen tonight
596 rectifier - excellent (slightly warm/muddy)
6f8g nu - seem muddy w/596 combo
6f8g ts - smooth more refined airy w/596 combo
6sn7 nu - even smoother. Detail upon detail. Feel like I'm in the room with bad as they are recording. Hear chairs squeaking and all. W/596 combo.
Brimar 5z4g will be here tomorrow.(hopefully) Look forward to trying it with the same drivers.
Have a great evening.

I am glad you are liking the 596. I normally run them with TS 6F8G round plates.