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The Stax Thread III - Page 37

post #541 of 3437
Quote:
Originally Posted by mangler View Post


TOGTE = This One Goes To Eleven ?

 

Yup! Thazzit.

 

Prolly total overkill for anything Stax. But waddoo I know?


Edited by livewire - 10/10/13 at 11:40pm
post #542 of 3437
Quote:
Originally Posted by eric65 View Post
 

 

With 6-10 volts average output voltage at the output of RKV (on a maximum 80 volts) for listening to an average level of 74-80 dB, and a load> 2 KOhms, there is no audible distortion. The degree of transparency and presence of sound is exceptional with 009 Stax headphones (without the 1:50 Wee transformers (bypassed)).

 

Otherwise, the RKV amplifier is used directly (without Wee transformator) to gain a high voltage (6-12 volts average ; maxi 80 Volts RMS), but with a very low power: maybe 40 mWatts to maximum output voltage of 80 volts RMS for a Stax 009 with an 145 KOhms impedance. (NB: the RKV can produce 3 Watts with a load of 200 Ohms)

 

 

Hello.

 

Potentiometer RKV 15 h (mean level "medium to high" loudly enough for me): 7.42 Volts (77.5 dB SPL)

 

 

 

Potentiometer RKV to 17 h (max) (mean level "strong" too hard for me): 12.72 Volts (83 dB SPL)

 

 


Potentiometer fully RKV (17 h) and with the Wee transformers bypassed, I just registered to a peak voltmeter level of at least 56 volts on a percussion (large drum) in a jazz recording of Henry Texier "Mad Nomads" that corresponds to a peak noise level of at least 96 dB SPL !

 

Otherwise, I always confirms the high degree of transparency and clarity of sound, and the realism and the strong presence of the vote.

Always zero audible breath.

 

Finally, the RKV amp has not given up the ghost and I do not see how it could do with a load of nominal output of 145 KOhms.

 

Eric


Edited by eric65 - 10/11/13 at 12:08am
post #543 of 3437

Be careful.

 

To operate the combo RKV-Wee with enough gain (the transformators Wee shunted), it is imperative that the source (dac) has an output with an enough high level ; if it is not the case, the amplification gain of the RKV will be too weak to reach an average level expected of listening of 80 to 84 dB SPL (enough to use) and  a maximal (peak) modulation of 96 to 100 dB SPL.

post #544 of 3437

Anyone have any experience with the WooAudio GES?

post #545 of 3437
Quote:
Originally Posted by livewire View Post
 

 

Yup! Thazzit.

 

Prolly total overkill for anything Stax. But waddoo I know?

 

Well any Stax headphone will not like going past 1200Vp-p so yeah... pretty much overkill

post #546 of 3437

I am biasing an SRM-600 ltd.

My question is: when measuring the dc balance and offset, the volume potentiometer (pot) should be in which position: at zero or at max or indifferent?

Thank for help. 


Edited by Pier Paolo - 10/14/13 at 6:44am
post #547 of 3437

Doesn't matter unless you have DC from the source which would be a pretty bad thing. 

post #548 of 3437

Oh, but I will measure without input signal connected. It is OK?

post #549 of 3437

For information : test in France Stax SRM-T2 + SR-009 : disappointing results.

 

 

Links (in french)

 

http://www.homecinema-fr.com/forum/post177806096.html#p177806096

http://www.homecinema-fr.com/forum/post177806821.html#p177806821

post #550 of 3437
Quote:
Originally Posted by Pier Paolo View Post
 

Oh, but I will measure without input signal connected. It is OK?

 

Yes, that is perfectly fine. 

post #551 of 3437
Quote:
Originally Posted by eric65 View Post
 

For information : test in France Stax SRM-T2 + SR-009 : disappointing results.

 

 

Links (in french)

 

http://www.homecinema-fr.com/forum/post177806096.html#p177806096

http://www.homecinema-fr.com/forum/post177806821.html#p177806821

 

So swapping the tubes helped a bit...

Just guessing here, replacing all of the old capacitors and a general "tune-up" would help as well.

Curious how the T2 performed with the Omegas?

post #552 of 3437

As much as this test is informative; they had no 717  (OK, not so important as it's no longer made) ...but no BHSE...is not that amp based somewhat on the T2 with modernization and many upgraded components? (Alps, etc). Still the best sounding amp with 007 or 009 that I've heard and hence the benchmark for comparisons such as this.

post #553 of 3437

Benchmarks? Woo-Wee!

post #554 of 3437
Hi, my 600 ltd is arrived and I am trying to biasing it. I can set the DC balance near to zero volts, but I can't set the DC offset: values are too high, near to -200V.
This is strange. i have measured also the DC offset value with the unit OFF and I have -70V. Someone can help?
Edited by Pier Paolo - 10/16/13 at 10:41am
post #555 of 3437

It is not possible to have DC offset with the amplifier turned off. 

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