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Question about amps for the Stax SR-009 - Page 47

post #691 of 724
Quote:
Originally Posted by VandyMan View Post
 

I'm getting close to purchasing my SR-009s. I have a pair of Musical Fidelity M-250s in my closet. They are very quiet 250 watt mono-blocks. Would it be ok to use them with the Woo Wee to power the SR-009s until I buy a dedicated amp? (The wait for the BHSE is 6-8 months.) 

 

Here are the specs:

Output voltage, RMS 45 Volts 20Hz to 20kHz peak 127 Volts
Power output 250 Watts into 8 Ohms (24dBW) 450 Watts into 4 Ohms
Peak-to-peak output current 72 Amps
Damping factor 180
Output devices per channel 6
Total Harmonic Distortion + noise 0.006% at 1kHz up to 90% power, into 4 or 8 Ohms
Intermodulation distortion 0.004% at 12.5 Watts into 8 Ohms
Frequency response 20Hz to 20kHz ±0dB
10Hz to 100kHz +0 / -1.5dB
Audio gain 30dB (31.5 times) nominal
Input impedance 31K Ohm
Input sensitivity for full power output into 8 Ohms 1.42 Volts
Signal / noise ratio, reference full power output > 115dB “A”- weighted

 

Without any problem.

 

The voltage multiplier factor of the Wee transformers is 1:50

 

You could almost use your Musical Fidelity M-250 amplifier directly on the 009  by deleting (bypass) the two transformers 1:50  voltage of the Wee and keeping only the transformer  providing bias voltage 580 Volt DC on the 5th slot of theStax headphone.

127 Volts output ( peak) will give level peak > 100 dB with a nominal sensitivity Stax headphone of 101 dB / 100 Volt RMS.

post #692 of 724

Thanks Eric!

post #693 of 724

There is also the Stax SRD7 with pro bias. This could be preferable to the WEE, especially if you can get hold of one with SPRITZERS updated boards. 

post #694 of 724
Quote:
Originally Posted by Golfnutz View Post
 

Just noticed that Woo Audio is now offering the Psvane EL34PH as an upgrade tube to their WES amp ($480 w/ 1yr warranty).

Hi

Don't get too carried away with what Woo(or any other Manufacturer) offer as 'standard' or 'upgrade' tubes.It's probably more down to being able to source a regular supply of 'trusted' tubes.

I've recently purchased a VTL S200 (for my speaker system) and enquired about substituting the KT-88s for some good old NOS GECs.They wouldn't have it and stated it would invalidate the warranty.Nothing to do with sound quality,just a commercial decision!! However, Headphone Amp manufacturers appear to more 'open minded' about tube rolling and Woo  publish a list of suitable replacements without any question of warranty infringements . In my case and with good advice, I've 'upgraded' to the tubes of my choice and I'm totally amazed what can be achieved.

post #695 of 724
Quote:
Originally Posted by britneedadvice View Post
 

Hi

Don't get too carried away with what Woo(or any other Manufacturer) offer as 'standard' or 'upgrade' tubes.It's probably more down to being able to source a regular supply of 'trusted' tubes.

I've recently purchased a VTL S200 (for my speaker system) and enquired about substituting the KT-88s for some good old NOS GECs.They wouldn't have it and stated it would invalidate the warranty.Nothing to do with sound quality,just a commercial decision!! However, Headphone Amp manufacturers appear to more 'open minded' about tube rolling and Woo  publish a list of suitable replacements without any question of warranty infringements . In my case and with good advice, I've 'upgraded' to the tubes of my choice and I'm totally amazed what can be achieved.


Yep, been there done that with the WA22 (like many others have). Let us know in 6 months if you still have yours.

post #696 of 724
Quote:
Originally Posted by Golfnutz View Post
 


Yep, been there done that with the WA22 (like many others have). Let us know in 6 months if you still have yours.

 

Please do tell :rolleyes:

post #697 of 724

After hearing my 009 for a few weeks with stax 727 mk2 i have finally get my woo audio wes (basic version). Well i have read some critical reviews about this amp, but i must say i was blown away by the sound. Compared to my stax, dynamics, detail, bass and smoothness were much better. Maybe one can get more from stax sr009, but i must say i have not heard better headphones system.

post #698 of 724
Quote:
Originally Posted by Cortazar View Post

After hearing my 009 for a few weeks with stax 727 mk2 i have finally get my woo audio wes (basic version). Well i have read some critical reviews about this amp, but i must say i was blown away by the sound. Compared to my stax, dynamics, detail, bass and smoothness were much better. Maybe one can get more from stax sr009, but i must say i have not heard better headphones system.

If you're happy, that's what matters.
post #699 of 724

I heard the WES at a show with the 009 and thought the upper mids were sort of peaky, but it was just a demo experience.

I think the 009 needs some amp that warms it up a bit.

I still think the 009 may need an amp tailored for it.


Edited by rgs9200m - 3/27/14 at 5:23pm
post #700 of 724
Quote:
Originally Posted by rgs9200m View Post
 

I heard the WES at a show with the 009 and thought the upper mids were sort of peaky, but it was just a demo experience.

I think the 009 needs some amp that warms it up a bit.

I still think the 009 may need an amp tailored for it.

 

I think the SR-009 sounds a little warm coupled with my Cavalli Liquid Lightning. A lot of people on head-fi who've heard this combo seem to agree. It definitely gives more than enough bass for my tastes (but not too much, it still sounds gorgeous). It'll be interesting to see how it sounds on other amps. I think it's such a neutral headphone that it will sound different on each amp, and really tell you what kind of sound signature that amp delivers. I think I'm going to experiment with very poor quality sources just for the fun of it and see how it sounds (such as 64 or 128 kbps mp3 files). It'll probably still sound better than most anything else out there. :p 

post #701 of 724
Quote:
Originally Posted by Golfnutz View Post


Yep, been there done that with the WA22 (like many others have). Let us know in 6 months if you still have yours.

Me too, only with a WA5: 2x 5u4g, 2x 6sn7, 2x 300B, I had more $$$ in my (active) tube combo than the cost of the Woo amp.

But of course with NOS tubes one must have a backup set, a backup for that and probably many more; not to mention if one of your tubes from a matched pair of Tung Sol BGRP or WE300B went south it could really ruin your day.

Sold it all lock, stock and barrel, got a BHSE and 009's two years ago this June and haven't looked back.
post #702 of 724
Quote:
Originally Posted by Golfnutz View Post
 


Yep, been there done that with the WA22 (like many others have). Let us know in 6 months if you still have yours.

Hi Golfnutz

Your reply indicates you missed the point of my post!

I was simply making a point about what manufacturers used as 'stock' tubes.

In reply to your comment-I assume you found keeping a second set of tubes difficult?

I don't know why you mention the WA22(as your comment could equally apply to any tube unit)if you didn't like it in the first place,why did you buy it?

Yes,I've gone from SS to tubes and back again, a couple of times.  And yes I've just bought a VTL tube Amp for my main speaker system.Neither of my tube Amps require  biasing or maintainance other than to replace the tubes.Now come on,that can't be difficult, can it?

Just as an interest, read Bea Lam's interview if you want to know why tubes are best.Audio Engineers can bore the pants of you with technical analysis.Professional Musicians know the truth!!

post #703 of 724
Quote:
Originally Posted by vinyllp33 View Post


Me too, only with a WA5: 2x 5u4g, 2x 6sn7, 2x 300B, I had more $$$ in my (active) tube combo than the cost of the Woo amp.

But of course with NOS tubes one must have a backup set, a backup for that and probably many more; not to mention if one of your tubes from a matched pair of Tung Sol BGRP or WE300B went south it could really ruin your day.

Sold it all lock, stock and barrel, got a BHSE and 009's two years ago this June and haven't looked back.

Hi vinylllp33

Here again, I can't see the point of this post.Should you choose to keep several sets of tubes, that's up to you.Yes I keep a 'stock', but that's only because I want to safeguard the type of tubes I want for the future.So you've moved onto a BHSE? so 4 tubes instead of 6, so what's your point?? Surely you'd feel the same if you'd bought a set of NOS Mullards EL34s ?Your ID indicates you're into Vinyl? when was vinyl the most easiest of sources?(compared to digital sources)Had you stated you'd moved to SS,I could see the argument.(but then my reply to Gofnutz would apply)

post #704 of 724

Further to my post above I mean Classically trained professional musicians!

post #705 of 724
Quote:
Originally Posted by vinyllp33 View Post


Me too, only with a WA5: 2x 5u4g, 2x 6sn7, 2x 300B, I had more $$$ in my (active) tube combo than the cost of the Woo amp.

But of course with NOS tubes one must have a backup set, a backup for that and probably many more; not to mention if one of your tubes from a matched pair of Tung Sol BGRP or WE300B went south it could really ruin your day.

Sold it all lock, stock and barrel, got a BHSE and 009's two years ago this June and haven't looked back.


Wow, almost identical stories. With tubes ($4K), HP's, WA22, testers, I was at $10K. I thought to myself this is nuts, I could have had the BHSE and SR-009's for this amount of money.

 

I ended up doing what you did - we must have been in the same BHSE batch.

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