Competition Closed...but what is in the Retro – Stereo 50?
Mar 5, 2015 at 3:03 PM Post #166 of 516
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And what was the answer? ................................

...........was 781 components!

 

Towards the high end of the range.
 
We shall explain a little more in a parts quality overview at a later date.

 

Starting with the 5th to 10th prizes, the winners are

 
Winner no: 5     
sdolezalek
 
Winner no: 6  
bms44974
 
Winner no: 7
DougD
 
Winner no: 8
guido
 
Winner no: 9
murphythecat
 
Winner no: 10
themad
 
 
A BIG congratulations to you all.
 
Each of you have won a Music Direct $30 voucher AND Jazz or Classical compilation Native DSD Music album download.
 
 
What to do next:
 
 
1) Please drop our Laura a PM on Head-Fi or email press@ifi-audio.com
 
In this PM/email please outline:
 
i. Your actual name and H-F name
 
ii. Your preferred contact - email or phone
 
 
2) We will then forward your details to Music Direct and Native DSD Music respectively and they will arrange to award you your prize!
 
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iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
Mar 5, 2015 at 3:43 PM Post #168 of 516

rmullins08

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Drats.
 
Mar 5, 2015 at 5:22 PM Post #169 of 516
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  Drats.

 
Still prizes 1-5 to go mate (chin up)
 
Congrats to those who've been selected so far.  And thanks again to iFi for making the opportunity available.
 
Mar 5, 2015 at 5:23 PM Post #170 of 516

rmullins08

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Still prizes 1-5 to go mate (chin up)
 
Congrats to those who've been selected so far.  And thanks again to iFi for making the opportunity available.

 
Chin up would require I guess correctly though.  Oh well.  Keep eyeing that Retro 50.  Need to buy a new place so I actually have a good spot for one first.
 
Mar 6, 2015 at 12:45 AM Post #174 of 516

EVOLVIST

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Where are you guys getting 1 through 5 are left to pick? 5 through 10 were announced, which leaves only 4 lucky winners with prize packages.

This has been fun. Looking forward to reading iFi's overview of the parts quality, too. And donuts. And donuts. And...:)
 
Mar 6, 2015 at 11:35 PM Post #176 of 516

EVOLVIST

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.. ..-. .. / -.-. . .-. - .- .. -. .-.. -.-- / -.- -. --- .-- ... / .... --- .-- / - --- / .--. .-. --- .-.. --- -. --. / - .... . / .- --. --- -. -.-- .-.-.- / .. - / .-. . -- .. -. -.. ... / -- . / --- ..-. / .- -. / --- .-.. -.. / .--- --- -.- . ---... / .-..-. .... --- .-- / -.. --- / -.-- --- ..- / -.- . . .--. / .- -. / .- ... ... .... --- .-.. . / .. -. / ... ..- ... .--. . -. ... . ..--.. .-..-. / .-.-.- .-.-.- .-.-.- .. .----. .-.. .-.. / - . .-.. .-.. / -.-- --- ..- / .-.. .- - . .-. .-.-.- :beyersmile:

.. / .-.. --- ...- . / - .... . ... . / --. ..- -.-- ... / .- -. -.. / -.. --- .-.. .-.. ... / .- - / .. ..-. ..
 
Mar 7, 2015 at 12:48 AM Post #177 of 516

cskippy

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.. ..-. .. / -.-. . .-. - .- .. -. .-.. -.-- / -.- -. --- .-- ... / .... --- .-- / - --- / .--. .-. --- .-.. --- -. --. / - .... . / .- --. --- -. -.-- .-.-.- / .. - / .-. . -- .. -. -.. ... / -- . / --- ..-. / .- -. / --- .-.. -.. / .--- --- -.- . ---... / .-..-. .... --- .-- / -.. --- / -.-- --- ..- / -.- . . .--. / .- -. / .- ... ... .... --- .-.. . / .. -. / ... ..- ... .--. . -. ... . ..--.. .-..-. / .-.-.- .-.-.- .-.-.- .. .----. .-.. .-.. / - . .-.. .-.. / -.-- --- ..- / .-.. .- - . .-. .-.-.-
beyersmile.png


.. / .-.. --- ...- . / - .... . ... . / --. ..- -.-- ... / .- -. -.. / -.. --- .-.. .-.. ... / .- - / .. ..-. ..

I hear what you did there...
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Mar 7, 2015 at 12:51 PM Post #178 of 516
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Uber Parts Quality and then some (Part 2)

 
The rest of the Tube Amplifier Circuit of the Retro Stereo 50 is as classic as they come, though the use of modern SMD components including MELF resistors...
 

 
and  C0G capacitors...
 

 
...take the performance of an old friend to new heights.
 
 
How good are these parts?
Put it this way, for the revised AMR Signature Series, the C0G has superceded the Sanyo OSCONs capacitor which was used in the digital section of AMR machines. A case of trickle-up technology. Yes, these have also been used in the micro iDSD as covered in the Crowd-Design thread.
 
The tube circuit itself is ultra-simple, yet also highly refined.
 
The ECF82 driver tube is what is called a "compound tube", it contains a small signal pentode and a fairly high power triode.
 


 
The pentode is employed as the only voltage gain stage, in this it is very similar to the design of the classic Western Electric type 91A amplifier, which introduced the 300B tube in single ended operation to the world and which is still held in highest esteem among the tube cognoscenti.
 

The triode is directly coupled to the pentode gain stage and operates as what is called a "split load phase splitter". It provides the two absolutely equal, but opposite drive signals to the power stage. As this triode is quite powerful we use this power to create a powerful driver stage for the power tubes, with much better drive than the ECC83 tubes often found as drivers in EL84 Amplifiers.
 
The only coupling Capacitors (German Wima MKP-04 types) in the Amplifier link the driver stage to the EL84 power tubes, which operate in cathode biased mode for maintenance and adjustment-free use. The output stage uses a configuration named "Ultra-linear" which gives a good mix between the high efficiency of pentode operation and the smooth and musical sound of triode operation. Around 15dB of negative feedback are used to lower output impedance and distortion, just enough to improve performance but not so much to create the dead, high-feedback sound many solid state amplifiers suffer.
 
Next time....Power is everything (Part 3)
 
iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
Mar 10, 2015 at 9:57 AM Post #179 of 516

tf1216

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Hello iFi,
 
Will he be hearing who placed 1 thru 5 today?  I am getting excited to see who wins all of the gear.
 
Mar 10, 2015 at 10:30 AM Post #180 of 516
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From the 4th to 2nd prizes, the winners are...

 
 

4th prize - Music Direct $200 voucher AND 2 free Native DSD Music album downloads

Goes to...Mach3
 
 

3rd prize* - micro iTUBE with micro iCAN with 3 free Native DSD Music album downloads (worth over US$550)

Goes to...GearMe
 
 

2nd prize* - micro iDSD with Alclair Curves iems with 4 free Native DSD Music album downloads (worth over US$700)

Goes to...brooko
 
 
Nope, we have not forgotten the 1st prize!
 

and the 1st prize* - micro iDAC2 (launch in early April) + micro iTUBE + micro iCAN + iRACK with 5 free Native DSD Music album downloads (worth over US$1000)

Goes to...evanft
 
 
* The 1st, 2nd and 3rd prizes will all be signed by one of the Skunkworks team. We'll personalise it for you. Doesn't get much better than that!
 
 
A huge congratulations to you all!!!
 
 
 
What to do next:
 
 
1) Please drop our Laura a PM on Head-Fi or email press@ifi-audio.com
 
In this PM/email please outline:
 
i. Your actual name and H-F name
 
ii. Your preferred contact - email or phone
 
iii. If you are 1st, 2nd or 3rd winner, your delivery address (as we need to get the iFi units to you!).
 
 
Last and not least we would like to say a big THANK YOU to all who have participated. And if you enjoyed this competition, we may host another in the not too distant future.
regular_smile .gif
 
 
And many thanks to Alclairs, Music Direct and Native DSD Music. You guys are grrrrreat.
 
 

 
and

and
 

 
iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com

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