Vintage Series Price List

Vintage Series Price List (updated 20/2/2014)

Please use this page for your price reference. Due to the ever increasing price of iron and copper, we will try to keep our price to be reasonable but we can’t do so forever. So, order early to save more money. If you have other specifications, please contact us.

1.35K single ended output transformer

• ·        For 6AS7, 6080 low impedance double triode and similar tubes
  ·        Japanese Z11 core, EI-66x36 core, encapsulated with wires drawn out
  ·        1.35K – 1K dual-taps, 0-4-8 Ohm output
  ·        100mA primary current
  ·        20Hz – 20kHz @ +/- 0.5dB @ 8 Ohm 1W
  ·        Size 68mm (L) x 68mm (W) x 58mm (H)
  ·        U$131/pair

5K single ended output transformer version 1.0

• ·        For 45, EL84, 5687, 5842, 6C45PI
  ·        Japanese Z11 core, encapsulated with wires drawn out
  ·        5K with 43% SG ultra linear tap for Pentode, 0-4-8-16 Ohm output
  ·        Size 68mm (L) x 68mm (W) x 58mm (H)
  ·        U$131/pair

5K single ended output transformer version 2.0

• ·        For 45, EL84, 5687, 5842, 6C45PI, 6L6, 6V6
  ·        Japanese Z6 0.3mm lamination EI-66x30 core, Teflon/Nomex insulation
  ·        5K, 0-4-8-16 Ohm output
  ·        Primary DCR 326 Ohm
  ·        20Hz – 20kHz +/- 0.5dB @ 1W
  ·        Size 68mm (L) x 68mm (W) x 58mm (H)
  ·        U$171/pair

10K single ended output transformer

• ·        For 10, 10Y, VT25A, 801A and similar tubes
  ·        Z6 EI-66x36 core, 0.3mm lamination, Teflon/Nomex insulation
  ·        10K : 0 – 8 – 16 Ohm
  ·        Precision primary winding with low tolerance
  ·        Wide bandwidth – 20Hz – 20kHz @ +/- 0.5dB (50kHz -3dB)
  ·        U$209/pair

1:1 interstage transformer

• ·        For 5842, 6C45, 5687, 6H30 and similar tubes
  ·        5K: 5K @ 30mA
  ·        U$119/pair

1: 0.5 + 0.5 interstage transformer (phase splitting)

• ·        Multiple configuration possibilities
  o   For single ended to push-pull configuration, single ended to single ended
  o   1:1, 1:0.5,  1:0.5+0.5
  ·        Z11 core
  ·        Secondary can be in parallel for lower impedance output
  ·        Primary 5K, primary DCR 370 Ohm, secondary DCR 265 Ohm + 265 Ohm
  ·        Maximum primary current 30mA
  ·        20Hz – 20kHz +/- 0.5dB
  ·        Size 59mm (L) x 55mm (W) x 51mm (H)
  ·        U$169/pair

5:1 or 1:5 Permalloy or Z11 input transformer

• ·        80% nickel iron core, permalloy!
  ·        Encapsulated with solder taps
  ·        Teflon tape insulation
  ·        Usage: galvanic isolation, system with too much/less gain, for driving low impedance stages / cables (step down configuration)
  ·        15k: 600 Ohm (5:1) step-down or step-up
  ·        Size 50mm (L) x 43mm (W) x 59mm (H)
  ·        U$276/pair (Permalloy); US$138/pair (Z11)

10:1 or 1:10

• ·        80% nickel iron core EI-48x16, permalloy!
  ·        Encapsulated with solder taps
  ·        Teflon tape insulation
  ·        Usage: galvanic isolation, system with too much/less gain, for driving low impedance stages / cables (step down configuration)
  ·        60k: 600 Ohm (5:1) step-down or step-up
  ·        20Hz – 20kHz @ +/- 0.1dB
  ·        Size 50mm (L) x 43mm (W) x 43mm (H)
  ·        U$276/pair

 

1+1 : 1+1 inter-stage transformer

• ·        Japanese Z11 EI-57x30 core
  ·        Solder taps
  ·        DCR 400 Ohm per winding
  ·        4K + 4K : 4K + 4K (output ~100V rms)
  ·        Maximum primary current 30mA
  ·        Recommended for driver tubes with <4K Rp
  ·        20Hz – 20kHz @ +/- 0.1dB
  ·        Size 59mm (L) x 57mm (W) x 51mm (H)
  ·        U$137/pair

0.5H / 0.5A choke for DAC power supply

• ·        <4 Ohm DCR
  ·        Nickel plated copper encapsulation for extreme low noise emission
  ·        Solder taps
  ·        Suitable for either CLC or LCL topology
  ·        Size 50mm (L) x 43mm (W) x 34.5mm (H)
  ·        U$31

8H / 150mA choke for tube power supply

• ·        100 Ohm DCR
  ·        Encapsulated with solder taps
  ·        Size 59mm (L) x 52mm (W) x 51mm (H)
  ·        U$28

5H / 220mA choke for tube power supply

• ·        47 Ohm DCR
  ·        Encapsulated with solder taps
  ·        For CLC or LC (400V below)
  ·        Size 59mm (L) x 57mm (W) x 51mm (H)
  ·        U$37

60H / 30mA plate choke (audio frequency)

• ·        Japanese Z11 core
  ·        Encapsulated with solder taps
  ·        Primary DCR 1095 Ohm
  ·        20Hz – 20kHz @ +/- 0.5dB
  ·        Maximum primary current 30mA
  ·        Suitable for 6C45, 5842, 5687 and similar tubes
  ·        Size 50mm (L) x 57mm (W) x 43mm (H)
  ·        U$103 MATCHED PAIR

20H / 50mA choke for tube power supply

• ·        Nickel plated copper encapsulation for extreme low noise emission
  ·        For choke-input (LC) or cap-input (CLC)
  ·        U$29

7H / 350mA @120Hz

• ·        Especially for choke input / can be used as cap input too.
  ·        High stability and linearity, maintain 90% inductance at full load.
  ·        High durability build – selected high temperature and high insulation strength wires
  ·        EI-76x50 core, encapsulated with wires drawn
  ·        DRC 77 Ohm, 400mA max
  ·        Size 81mm (L) x 89mm (W) x 69mm (H)
  ·        U$78

Choke for filament/solid-state amplifier

• ·        2mH 15A DCR 30 mOhm
  o   EI-66x30, 2mm cable size, for CLC use
  o   Tolerate up to 120% overloading
  o   Size 92mm (L) x 63mm (W) x 58mm (H)
  o   US$41

• ·        230mH 1.6A DCR 1.5 Ohm
  o   EI-66x30, for CLC or LC (choke in)
  o   Tolerate up to 120% overloading
  o   Size 92mm (L) x 63mm (W) x 58mm (H)
  o   U$41

Grid Choke

• ·        80% nickel iron core, permalloy!
  ·        Encapsulated with solder taps
  ·        Teflon tape insulation
  ·        1200H / 120Hz
  ·        U$104/pair

Special Edition: PX3.5SE MK2 - U$259/pair

• For: 300B, EL34, and etc
• Pri: 3.5K, 
• Sec: 4/8/16 Ohm, 
• 20W, 90mA.
• Z11 core, Nylon bobbin
• Official frequency response: 20Hz – 20kHz +/- 3dB or better (tested to be ~+/- 1.5dB)
• Special Edition – better bass, flatter frequency response, but lower output power headroom.

Special Edition: PX-3.5SE, PX-5SE - U$399/pair

• For: 300B, 2A3, EL34, 45 and etc
• Pri: 3.5K or 5K, 
• Sec: 4/8/16 Ohm, 
• 65W, 170mA.
• Z11 core, Nylon bobbin.

Special Edition: PX2.5SE - U$249/pair

• For: 300B, 2A3
• Pri: 2.5K, 
• Sec: 4/8/16 Ohm, 
• 25W, 170mA.
• Z11 core, Nylon bobbin.

Special Edition: Chokes (with end bells)

• PCH5       - 5H 400mA                   - U$89
• PCH10A  - 10H 300mA                 - U$89
• PCH10B  - 10H 250mA (211 use)  - U$89

For custom specifications, or Precision Series price, please email us for quotation.

J&K Audio Design
24/12/2013



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Click here to find out what other interesting services we offer. 
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Level 2: link 1, link 2, link 3, link 4, link 5, link 6 

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.

Products Home Trial

Products Home Trial

We have received many questions on where they can listen to J&K products and request if they have have a home trial. After some thoughts, we're saying yes - for finished products only!

Here are the 2 options you can have:

1. Home trial of brand new in box items.
• Restocking fees of 15% applicable.
• For those planning to own our products but want some insurance, just in case.
2. Home trial of our demo units (limited to availability).
• No restocking fees. 
• Good for those who are not sure yet if our stuff is good.

Terms & conditions:

1. Items must be returned in original conditions with original packing materials. For any product not shipped back in its original condition, an appropriate restocking fee of 25% will be charged.
2. Lost of packing materials or return in non original packing materials will be charged a replacement fee.
3. No refund will be issued for products that have been damaged, altered, or abused.
4. Outstation / overseas buyers and testers of this service pay for shipping. 
5. Local customers (Penang, Malaysia) can arrange pick-up or home visit / delivery with us.
6. If use payment methods like PayPal with surcharges, the refund will be after the surcharge deductions. 
7. Not all items are available for home trial due to the nature of our product types.

Step 1: Shop around.

Find the J&K products that best suit your needs, and simply place your order by email or over the phone at +6017-4747808. Pay and wait for your items to arrive.

Step 2: Try them for 30 days.  

Once your J&K products arrive, test-drive them for 30 days with your own music and movies, connected to your own equipment, and surrounded by the only acoustics that matter: your room. 

Step 3: Fall in love or send them back.

This is a two-pronged step in that you have two options. If you fall in love with our products, they move in permanently. If you’re not so crazy about them, just inform us and ship them back using registered air mail. 

Once your return merchandise arrives, we will inspect it to ensure it has been shipped back to us in its original condition. Just make sure the item gets returned in its original packaging with all the remotes, manuals, wiring and even feet included. Upon a satisfactory inspection, we’ll credit your account on the balance.

Some items are only eligible for return if they are unused and returned in their original packaging. No refund will be issued for products that have been damaged, altered, or abused. We’ll credit your account once we receive the undamaged products, simple as that. 

HANG ON TO THE ORIGINAL PACKING MATERIALS

You must return the merchandise back to J&K in the original packaging materials. If you have tossed them, new packing materials may be sent to you at a nominal cost if they are available. Contact us to check for availability.  Some of our products are heavy and can get damaged in shipping without proper protection, so we suggest you keep your packing materials during and beyond your warranty period, just in case they need to be sent back for return or service.

J&K Audio Design
18/2/2014

Product Lists  
Level 0

Level 1: link 1, link 2, link 3

Level 2: link 1, link 2, link 3, link 4, link 5, link 6 

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.

Recycle Transformers

Let's save our mother earth -> recycle transformers. Before we go further, I'd like to thank GS Ch'ng as this article is contributed by him. I've done some minor editing to make it better for Web presentation.

Recycle Transformers

Above are DIY tube power transformer using recycled transformer cores!

• The bigger is version is a 100VA transformer. Input is 230V, output are 200V 0.5A, 6.3V 4A, 2.5V 7A and all used aluminum magnet wire.
• The smaller transformer is 50VA. Input is 230V (copper), output are 300V-0V-300V (copper), 5V 2A (aluminum), 6.3V 2A (aluminum). 

I like to use aluminum wires because they are cheaper. Therefore, I can use for practices without burning my pocket.

The above 100VA power transformer operates at 1 Tesla and 50VA power transformer operates 1.2 Tesla. Usually this is the standard. The formula for turns ratio is as follow:

Volts per turn = 4.44 x AC x Freq x Tesla

• AC = magnetic path cross section area in meter square
• Freq = operating frequency 50Hz / 60Hz
• Tesla = magnetic flux density.
• For very old poor core, it can be set as 0.8 Tesla.
• Normally I set as 1 Tesla. 
• Some better core materials can operate as high as 1.5 Tesla.

Example, for EI57 core and stack up of 20mm,  we have about 20mm x 20mm of magnetic path cross section, converting to meter square = 400um2.

4.44 x 400um2 x 50hz x 1tesla = 88.8mV per turn

1 Volt = 11.26 turns (assume 11 turns for easy calculation)

• For input voltage of 230V, # turns = 230 x 11 = 2530 turns
• For output voltage of 12V, # turns = 12V x 11 = 132 turns

The wire size is depand the current density, typically what I found is 3A/mm2. Some can be as high as 6A/mm2.

The lower the Tesla value is set, the more turns it needs, making it hard to fit the core. For higher Tesla value, the Eddy current is higher due to core loss is higher and therefore it gets hotter during operation.

This article is to encourage more (transformer) DIYer to convert the junk steel cores to valueable tube parts.

*** Extracted from GS Ch'ng's posting.

If you've any questions or comments, please use the form below and perhaps GS or we can help to answer them when available.

J&K Audio Design
16 FEB 2014.

Product Lists  
Level 0

Level 1: link 1, link 2, link 3

Level 2: link 1, link 2, link 3, link 4, link 5, link 6 

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.