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The Stax Thread III - Page 202

post #3016 of 5940

Ok I don't intend to get into a discussion with someone who isn't listening.

 

So far, you've just proven everything that I've said. You're doing things zealously and with a DMM and a microphone (have you seen the stuff arnaud models with a simulated head/listening test environment?). Really? Worse, the graphs which show how things perform are created by KG. For someone who loves to measure, you're also not even consistent with what you're doing.

 

So what are you trying to explore? The outputs of the RKV amplifier when different step-up transformers are paired to it? Why not measure what's at the output of the transformers (I mean that's what you're using to power your headphones?) You don't expect the various transformers (built to a cost) to be perfect do you? You're also not able to measure distortion from the transformers (which I would think is a major factor since you're talking about how great it sounds?) And why can't you even keep the test parameters consistent (why all the different output voltages from your amplifier? Cherry picking the voltages that will make your case look better?)

 

So what has your measurements accomplished except give more questions than answers? I really don't get it, I'm just some guy who derives enjoyment from things I've built (better if it performs well against commercial products). Don't worry, I won't be responding to your future posts. I'm pulling the same line from you "Megatron is the ****z. Period."

post #3017 of 5940
Quote:
Originally Posted by wink View Post
 

Anything you say will be just like water off a duck's back.

Block function is indicated here.

 

I'm starting to get it wink (no pun intended :tongue:

 

I won't block him... I just won't respond... I'll just have to trust myself with that :etysmile:

post #3018 of 5940
Quote:
Originally Posted by eric65 View Post
 

 

SPECS: OTL mode: (RKV-III amp, OTL mode)

  • power output:  5,8 watt - 220 ohm load - ( 1% THD )
  • max. output voltage 100 VAC / 2kohms load
  • bandwide: 10 - 150.000 hz ( 100 ohms )
  • Ri: 0.01 ohm
  • THD:  configure - LM 351 - 3V - 1 kHz
  •      100 ohm load 0,014%
  • THD:  configure - LM 351 - 3V - 10 kHz
  •      100 ohm load 0,014%

 

link : http://www.audiovalve.info/rkv3/audiovalve%20rkv%20mark3.php

lets look at this mess for a minute.

max voltage 100 VAC (peak to peak!) into 2000 ohms.  This I agree with.

I measured it. Any higher voltage swing and the amp happily violates

the cathode to filament voltage spec for the output tubes. And from some

of Mikhail's creations, we know what happens when you do that.

 

power output 5.8 watts into 220 ohms load. Do the calculations and its

the same exact 100 VAC peak to peak. Not possible. I measured it.

Less than 1 watt. And way more than 1% THD.

 

Which gets us to that Ri. what output level is this measured at?

Doing the calculations and it is about 150 nanowatts. Not really

of much use is it.

 

 

Schiit just published their numbers for the ragnarok

power: 60 watts rms into 8 ohms, 100 watts rms into 4 ohms

output resistance .03 ohms.

 

So you are a physician, with all those years of school and you

are going to tell me that the magical RKV is capable of 1/3

the impedance of the ragnarok.

 

Really?

 

How about that bandwidth spec. There is no opamp you can

stuff in that circuit that will provide enough closed loop gain

to make that anywhere near flat to 150khz. How many db down

at 150khz.  60db, 70db... More useless information.

 

RiStaR is correct. You are doing way more damage to your cause

by mixing apples, oranges and grapefruit.

 

Your voltage measurements above are completely useless as

no one listens that quiet.

 

And speaking of mixing your vegetables, you cannot drive a stax

headphone single ended as you have said in the past.

only the RKV III which is balanced can do that. And its good for

an absolute max of 400 volts peak to peak stator to stator in otl mode.

way off the mark compared to many of the electrostatic amps

out there which do 1600 to 2400 volts peak to peak stator to

stator.

 

And wink actually does know what he is talking about.

That comes from some well aged brain cells.


Edited by kevin gilmore - 8/27/14 at 4:47pm
post #3019 of 5940

I wouldn't have as much of a problem with the empty specs if there wasn't that first post with the ABX paper slips

post #3020 of 5940

A new Stax owner here (well, actually so new it's being shipped as we speak). We're talking Vintage Stax here (SRA-3S amp and SR-X MK2 headphones).

 

I'll share my experiences once they're here and hooked up.

post #3021 of 5940
Quote:
Originally Posted by Chozart View Post
 

A new Stax owner here (well, actually so new it's being shipped as we speak). We're talking Vintage Stax here (SRA-3S amp and SR-X MK2 headphones).

 

I'll share my experiences once they're here and hooked up.

That SRA-3s is a nice amp. I preferred it to the SRA-12s I had at the time I heard it.

post #3022 of 5940

Welcome my friend to the weird and wonderful world of Stax Earspeakers! We are an odd bunch but bond very well with our love of all things Stax.

I got my first Stax system aboput 30 years ago, a Lambda Normal Bias and an SRD-7 energiser. I sounded great, better than my speakers from the same power amp.

 

I would check the caps in your amp are A OK. It depends on how much it's been used. Take of the top case and look for leaks or bloated cases.

Also any other signs of damage to the boards or the transformer leaking. Are the fuses ok (no corrosion).

 

It would in any case be cheap to re-cap it, si if it works now, you are onto a winner I would say.

 

Check out a Spritzer post at the 'other site'. Search in Google for SRA-3S stax

post #3023 of 5940

Here's my new transformer-based Stax "adapter" box- (technician not included)

 

 

....and the amplifier to drive it

 

post #3024 of 5940

What are you eating? Can I have some?

post #3025 of 5940

But But, that's mono. You need 2 of them.

Given that the step up ratio would be 5 to 10, they should be

perfect, and very efficient. Designed for ultra low leakage

inductance etc...



edit: actually you need 4 because each would have only one high voltage output.
but since the input is center tapped it would work great with push pull tubes
Edited by kevin gilmore - 8/30/14 at 6:48am
post #3026 of 5940
^ Now that would be a Statement Stax Amp.
post #3027 of 5940
Quote:
Originally Posted by kevin gilmore View Post
 

But But, that's mono. You need 2 of them.

Given that the step up ratio would be 5 to 10, they should be

perfect, and very efficient. Designed for ultra low leakage

inductance etc...



edit: actually you need 4 because each would have only one high voltage output.
but since the input is center tapped it would work great with push pull tubes

You don't need that when you have this:

Death-Star-star-wars-4534240-1280-800.jpg

post #3028 of 5940
Quote:
Originally Posted by astrostar59 View Post
 

Welcome my friend to the weird and wonderful world of Stax Earspeakers! We are an odd bunch but bond very well with our love of all things Stax.

I got my first Stax system aboput 30 years ago, a Lambda Normal Bias and an SRD-7 energiser. I sounded great, better than my speakers from the same power amp.

 

I would check the caps in your amp are A OK. It depends on how much it's been used. Take of the top case and look for leaks or bloated cases.

Also any other signs of damage to the boards or the transformer leaking. Are the fuses ok (no corrosion).

 

It would in any case be cheap to re-cap it, si if it works now, you are onto a winner I would say.

 

Check out a Spritzer post at the 'other site'. Search in Google for SRA-3S stax


Thank you, and yes, I will check the condition of the amp, since it's obviously vintage. I own other vintage tube amplifiers (a Sonic Frontiers SFS-80 and a pair of Dynaco's MK-IV monoblocks, of course neither one is a headphone amp).  It's still in transit as we speak (ETA on Wednesday.. UPS Ground, and Monday is a Holiday.)  I'll keep you all posted on my experiences!

post #3029 of 5940

And a spare room in the house to install them all in :beerchug:

Quote:

Originally Posted by kevin gilmore View Post
 

But But, that's mono. You need 2 of them.

Given that the step up ratio would be 5 to 10, they should be

perfect, and very efficient. Designed for ultra low leakage

inductance etc...



edit: actually you need 4 because each would have only one high voltage output.
but since the input is center tapped it would work great with push pull tubes
post #3030 of 5940

That's the Stax Mafia walking past one of the output tubes there on the gantry....

 

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