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Monday, May 19, 2014

ALIS-5SE


Triode Mode
Pentode Mode
Impedance Sweep

Primary Inductance vs Current
Phase Shift

20Hz Square Wave
40Hz Square Wave
100Hz Square Wave
1000Hz Square Wave
10KHz Square Wave

20KHz Square Wave
J&K Audio Design
12 May 2014

Product Lists  
Level 0

Level 3: depends on type, size and complexity. Email us for details.
Iso-trans: link 1, link 2
* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
* Please email for volume discounts, distributor and OEM pricing.
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Friday, May 16, 2014

Output Transformers - ALIS

ALIS = Advance Level I(1) Series Output Transformers
* Much better performance than standard Level 1.
* Close to Precision Wind but not there yet.
* Standardization for affordability.
* Price updated (2016)


ModelSpecificationsPrice
ALIS-5SE
Click for measurements. 		Power: 25W(20Hz) Single Ended
Bandwidth:
* Pentode: 20(-2.5dB) -50kHz(-1dB)
* Triode: 10(-1dB) -50kHz(-1dB)
Primary: 3.5K, Secondary: 0-4-8 Ohm
DCR: 216 Ohm(B-P); 1.05 Ohm(Sec 0-8 Ohm)
Primary Inductance: 28H(@75mA, 40Hz, 5Vrms)
Primary Current: 80mA (120mA max)
Core: Z11 EI86

 * Matched at actual operating condition!
* Fully shrouded, upright, with leads out.
* Suitable for EL34,KT66,807,6L6,5881,6P3P,etc.
 U$299/pr
ALIS-5SE MK2
Click for measurements.  		Power: 30W(20Hz) Single Ended
Bandwidth:
* Pentode: 20-65kHz(-1dB)
* Triode: 10-40kHz(-1dB)
Primary: 3.5K, Secondary: 0-4-8 Ohm
DCR: 215 Ohm(B-P); 0.96 Ohm(Sec 0-8 Ohm)
Primary Inductance: 34H(@100mA, 20Hz, 5Vrms)
Primary Current: 90-100mA (120mA max)
Core: Z11 EI96
Size: ~100mm x 80mm x 95mm (H), mounting holes ~80mm x 65mm.

 * Matched at actual operating condition.
* Fully shrouded, upright, with leads out.
* For higher impedance beam/pentode or triode.
* Especially for KT88, 6550 and etc.
* Extended bass version.
 U$409/pr
ALIS-5SE Ultimate
Click for measurements.  		Power: 30W(20Hz) Single Ended
Bandwidth:
*Actual measured with 0 feedback
*300B: 9-70kHz +0/-1dB), 15-45kHz +0/-0.5dB
*2A3: 11-75kHz +0/-1dB), 17-50kHz +0/-0.5dB
Primary: 3.5K, 2.5K; Secondary: 0-4-8-16 Ohm
Pri. DCR: 82.5 Ohm(B-P2.5K); 97.5 Ohm(B-P3.5K)
Sec. DCR: 0.67 Ohm (0-16 Ohm)
Primary Inductance: 18H(@80mA, 20Hz, 5Vrms)
Primary Current: 65-85mA (100mA max)
Core: Special Mix Hybrid Cores - EI96

 * Matched in actual operating condition!
* DCR <1 data-blogger-escaped-br="" data-blogger-escaped-inductance="" data-blogger-escaped-primary=""> * 350V B+, -80V bias, 40Vpp in, at 8 Ohm.
* Fully shrouded, upright, with leads out.
* Especially suitable for 2A3 and 300B.
* Level 1 Ultimate.
 U$469/pr
ALIS-845SE Ultimate Power: 50W(20Hz) Single Ended
Bandwidth:
* Actual measured with 0 feedback on 845.
* 20(-0.3dB)-20kHz(-0.3dB)
* 20-20kHz +/-0.16dB
Primary: 10K; Secondary: 0-4-8 Ohm
Pri. DCR: 275 Ohm
Sec. DCR: 0.25 Ohm (0-8 Ohm)
Primary Inductance: 51.5H(@100mA, 20Hz, 5Vrms)
Primary Current: <=100mA (120mA max)
Core: SiFe Amorphous Double C Core
Size: 122(L) 122(W) 128(H)
Weight: 13KG/pair

 * Matched in actual operating conditions.
* DCR <1 data-blogger-escaped-br="" data-blogger-escaped-inductance="" data-blogger-escaped-primary=""> * Measurement graph provided.
* Shuguang 845, Vp 900V Ip 80mA 8 Ohm tap 1W.
* Potted.
* Special made for 845.
 U$1090/pr
ALIS-5PP
Click for measurements.  		Power: 50W(30Hz) Push Pull
Bandwidth: UL 10-60kHz +/- 0.5dB
Primary: 5K, Secondary: 0-4-8 Ohm
DCR: 166 Ohm(Pri, P to P); 0.62 Ohm(Sec 0-8 Ohm)
Primary Inductance: > 160H
Connections: P1 - UL1 - B - UL2 - P2
Core: Z11 EI86

 * Matched in actual operating conditions.
* DCR <1 data-blogger-escaped-br="" data-blogger-escaped-inductance="" data-blogger-escaped-primary=""> * Fully shrouded, upright, with leads out.
 U$329/pr
J&K Audio Design
17 May 2014

Product Lists  
Level 0

Level 3: depends on type, size and complexity. Email us for details.
Iso-trans: link 1, link 2
* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
* Please email for volume discounts, distributor and OEM pricing.
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Product Classifications

Level-0 Entry Best bang for the buck range, where price / performance ratio is at the highest to provide good quality with lowest price and size.
20Hz to 20kHz +/- 3dB or better is our standard reference, with exception to super high impedance transformers.
Certified made in Japan Z11 grain oriented EI core is used widely. (For cost sensitive users, H* grade cores can be offered at a lower price.) It offers good quality with good performance at the cost.
Over-specifications are done at a low level for reserves. Industrial grade copper wires are used. Good for starters or intermediate users.
Products: MiniWatt Series, Z11 based transformers.
Level-1 Standard Standard range, where price / performance ratio is balanced to provide good performance with a reasonable price.
20Hz to 20kHz +/- 1.5dB (15Hz to 40kHz +/-3dB) or better is the standard of this range, with exception to super high impedance transformers.
Certified made in Japan Z6 - Z10 grain oriented EI core, or even Z11 will be used, depending on the applications and requirements.
We offer the supposedly expensive Amorphous/Permalloy cores on this range too, where refurbished cores compensates for the lower price. Core lamination are aligned neatly for best transfer of electrical energy and efficiency.
Over-specifications are done at a medium level for more reserves.
Industrial grade or OFC wires will be deployed at extra charge.
Products: Refurbished Amorphous (NiFe) cores, Z6, Z9 or Z10 based transformers, matched components.
Level-2 Premium High performance comes at a price. This is built with the best technology, know how and premium materials from J&K.
20Hz to 20kHz +/- 1dB or better (8Hz to 60kHz +/-3dB) is the standard of this range for most of the models, with exception to super high impedance transformers.
Every little details that matters to the sound are tinkered and dealt with precision and perfection.
Products: Precision Wind (any cores), customized fiber glass transformer bobbins, precision matched components, C core output and power transformers.
Level-3 Alien-Class We deploy the absolute best in J&K, our trade secrets alien technologies and special tweaks unknown to the community to get this to the highest standards available with the best materials available to us. Specification ranges from 20Hz to 20kHz +/- 0.3dB or better (5Hz to 80kHz +/-3dB).
No, you may not know what they are to prevent our Intellectual Properties s being stolen or copied. Electronics is science but audio is an art, maybe even black magic!
It may measure similarly or appreciably better than the Premium range but the sonic signature and improvement it has is just unmeasurable or quantifiable with data like frequency response.
You've gotta hear it to believe.
Expect to pay premium for this - what you pay is what you get!
Products: Precision Wind, special cores, special materials, special enabling, special tweaking, special everything.

Above said, all are still built for continuous class A operation, with reserves for instantaneous dynamic peaks. We do not specify outputs at PMPO, or unrealistic modes, like 20W(70Hz) - this is for guitar use, not for audio!

Over specification is by 50% and up to 300%, depending on level, applications and customer requests.

Insulations are ensured to withstand 150%-300% operation voltage for continuous operation.

All these will give rise to better dynamic power transfer, lower distortion, lower operating temperature, lower noise floor and most importantly, better sound!

Some comments apply to both components and end products, whereas some applies to only dedicated components or end products.

Technical specifications may not be our strength but music is not just about measurements or numbers. Trust your ears and tastes.

J*K Audio Design
16 May 2014
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Thursday, May 15, 2014

Transformer Core Materials

Transformer Core Materials

People often ask me, what cores are we using for our transformers? Why some manufacturers name theirs as grain oriented silicon steel, Hi-B, Oriental Hi-B and etc? Well, there are many names, and actually some of them are the same. In order not to instill confusion, let me clarify some of the terms we use here. 

By the way - we offer custom made high grade Single and Double C Core Power Transformers now!

Here are some of the names of our standard Si Fe grain oriented cores:
  • 23ZDMH85 - C Core
  • 27ZH105 (aka Z6H) - EI core 0.27mm lamination thickness
  • 27Z130 (aka Z9) - EI core 0.27mm lamination thickness
  • 27Z145 (aka Z10) - EI core 0.27mm lamination thickness
  • 30Z145 (aka Z11) - EI core 0.30mm lamination thickness
  • Etc... 
Ours are all sourced from Nippon Steel & Sumitomo Metal, Japan (exclude NiFe Permalloy cores). Our Amorphous cores are from this same manufacturer as well, but a custom made version for our own usage only.

There are high grade core materials used for transformers. A lot of the other guys are using the lower grade materials, non grain oriented cores that are inefficient, larger in size comparison, hotter and sound worse. We don't use them for our high grade products. Period.

For cost sensitive users, we will consider coming out with more cost effective products in near future, depending on demand and user requests. We will specify clearly what materials will be used if customers ask for low cost products.


J&K Audio Design
15 May 2014

Product Lists  
Level 0

Level 3: depends on type, size and complexity. Email us for details.
Iso-trans: link 1, link 2
* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
* Please email for volume discounts, distributor and OEM pricing.


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Products Listing (15/5/2014)

Products mapping:(obsolete - best to contact us for orders if you cannot find what you want)

      • USD$476 / pair - workmanship + potting
        • Made to your specifications (input, output, interstage, or anything!)
        • Choose the materials you like and pay the extra for materials cost.
        • Or, supply us with your unique/premium own cores.
          • Nickel, Ferrite, Cobalt, Nano-crystalline, Amorphous, and etc.
      • Silver Output Transformers
        • Silver plated OFC wire
          • Hi-B double C core - USD$1229/pair
          • Amorphous double C core - USD$1499/pair
        • High purity (pure) silver wire
          • Amorphous double C core - USD$6229/pair
          • Other cores, please email, but amorphous is recommended. Price is no big difference with other cores. High purity silver is the main component cost.
      • Single + Double C Core Power Transformers (New! Give your amp the best!)
        • OFC wire
        • Nippon Steel 23ZDMH85 C cores 
        • Potting options available 


  • Power Transformer (customize only)
    • ~U$0.50 to U$1.00 per VA, depending on complexity and finishing.
    • Z11, Z10, C core (new).
    • Email us your specifications.
  • Choke / Inductor (customization available)
    • Plate / anode, power supply, crossover, and etc
    • Various values and sizes are available.
    • Z11, Z10, C core. 
    • Email us your specifications.

J&K Audio Design
15/4/2013 --> 5/5/2014

Click here to check out our product archive. 
Click here to find out what other interesting services we offer.
Click here to find out what output transformers we have.  
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Product Lists  
Level 0

Level 3: depends on type, size and complexity. Email us for details.
Iso-trans: link 1, link 2
* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
* Please email for volume discounts, distributor and OEM pricing.


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Monday, May 12, 2014

Nightshade Amplifier

Nightshade went for some matching test at a fellow audiophile place - with pretty high end gears before actual delivery happens.



Nightshade on Symposium clone - recommended.

Nightshade matched with Focus Audio
 Not a good match in terms of power but the sonic character is a good fit. If it can be made to produce higher power...

Nightshade is hidden behind the AudioNote Preamp

Now you see it, a temporary station for Nightshade.

Another view of the setup.

Nightshade mated with GEC U52 (original rectifier is German made Lorenze GZ32)

Nice glow from the GEC U52
Conclusion:
Do not expect Nightshade to do wonders by being able to drive the Focus floorstander fully but the sonic signature is really transparent, forward, detailed and revealing. At low volume, everything falls nicely into place, as what the Nightshade is meant for, night listening.

Nightshade can fully drive the Zu Soul Superfly but the highs come in too hot. Both components are more forward sounding and therefore the mid-highs are emphasized too much. Although so, the bass is impactful, taut and low. We can feel the sofa vibrating when there are low bass involved.

For those that like warmer character, it can be tamed further by selective parts for mellower sound. With the right partner, Nightshade should perform, and perform extremely well.

J&K Audio Design
12 May 2014

Product Lists  
Level 0

Level 3: depends on type, size and complexity. Email us for details.
Iso-trans: link 1, link 2
* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
* Please email for volume discounts, distributor and OEM pricing.
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Level 1: link 1, link 2, link 3, link 4

Level 2: link 1, link 2, link 3, link 4, link 5, link 6, link 7, Link 8, link 9

Level 3: depends on type, size and complexity. Email us for details.

Iso-trans: link 1, link 2

Power-trans: link 1

* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.