电源变压器

Here are some samples of power transformers 电源变压器 physical outlook you can specify for your orders, as a reference. If there are other types of output format you would like, you can send us the pictures and we shall see if those can be done. 

Point us to these transformer pictures when you order. It will make it easier for you to describe what you want with help of pictures.

EI Transformer

Impregnated Transformer

Audiophile EI Transformer

Audio Grade EI Transformer

Audio Grade Transformers

Audio Grade EI Transformer

Audiophile Transformers

Audio Grade Power Transformer

845 tube transformer

845 Power Transformer

Audiophile EI Transformer

Special EI Transformer Frame

Level 3 EI Power Transformer

Power Chokes

Silver Plated Copper Output Transformer

Super Hi-B Double C Chokes

Super Hi-B Power Output

Super Hi-B Power Transformer

Super Hi B Output Transformers

Super Hi B Output Transformers

Super Hi B Transformers

Double C core Output Transformer

Double C Core Power Transformer

Double C Core Transformer

Primary and secondary winding

Choke Measurement

Hybrid winding - silver + copper

Primary and secondary

Silver Plated Copper Magnet Wire

Silver Plated Magnet Wire Transformer

High Quality Magnet Wire for High Voltage Use (211, 845, 212)

J&K Audio Design

12/8/2015

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.

15K Primary Impedance Output Transformer

High primary impedance (>10K Ohm) has always been a challenge for most winders. Unfortunately, such high primary impedance are required for older tubes, like 6J5G, 6SN7, 801A and etc, that have Rp (internal plate impedance) of ~4K Ohm.


Here's a preview of the upcoming 15K OPT for 801A and similar tubes: 

20Hz to 20kHz TOTALLY FLAT

Full bandwidth: 10Hz (-0.5dB) to 60kHz (-3dB), measured with 801A tube in actual performing circuit.

J&K Audio Design

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.

输出变压器review

Greetings.

We have another output transformer (输出变压器) review from one of our customers. Sri is using our ALIS-5SE Ultimate for his 300B project.

Attached is the picture of his creation, and also the schematic for your reference. 

It is a 2 stage all direct heated Triode amplifier. It is using EML 30 tube to drive 300B. Interesting minimalism design!

 

Kudos to Sri for his effort, and 5% discount on his next purchase for sharing the details with us on using our products. Again, for those that are new to our blog, we offer 5% discounts for feedback obtained, sharing the details on the design, pictures and any that our users would like to publish.

J&K Audio Design

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.

11/16/2015

NOS Vacuum Tubes

We're always on the hunt for exotic NOS tubes. Our audio buddies and us have just scored a batch from UK and we'd like to share the pictures on our little treasure chest here. Some are mainstream and some are not.

One of our specialty is to use non-mainstream high quality NOS tubes in our designs. This way, our customers pay peanuts and yet they could get extremely high quality sound with those legendary NOS brands like Telefunken, GEC, Cossor, Mullard and etc vacuum tubes.

Cossor 41 MP triode

A box of NOS premium NOS tubes!

Cossor 45IU Rectifier

 This is my favorite! Antique shape rounded base old style rectifier, like the famous U52 rectifier. Yummy!!! Things do not get better than this!

Cossor Tube Boxes

NOS Cossor Valves

Treasures in old boxes!

Ain't this a beauty!

Cossor 41MP triode.

41MP triode. Modern tubes just don't come close!

A box full of premium NOS tubes! OSRAM, GEC, Mullard, Cossor, Telefunken, oh yes!!!

Match quad of Telefunken EL84

2nd match quad of Telefunken EL84, yummy!!!

Close up look of Telefunken EL84

STC 3A/108A triode

Osram 6J5G triode.

GEC Pentodes

Mullard GZ33, matched pair!

We can't wait to put these tubes into use!

J&K Audio Design
10/17/2015

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.

Tannoy Autograph Mini

Greetings! 

If you know me, I'm a fan of Tannoy's dual concentric speakers. I've owned Tannoy Arundels and Tannoy HPD 385A previously. I nearly got hold of a pair of Tannoy Gold but I missed the chance and regretted until today. I've even posted pictures of the Tannoy HPD 385A multiple times in this and my previous website - diy-audio-guide.com. 

I still own the HPD 385A but it was retired as the surrounds had rotten and I do not have the space to place it for now as this pair of speakers is huge! It will resurface some day for sure, when I upgrade my house or retire to the country side where property prices are more reasonable.

Why am I bring this old story up here? Well, I'd like to share a picture of the setup number "n" of a personal close audiophile friend that I knew for over 15 years that is using the Nightshade Miniamp that I built quite some time ago with Tannoy Autograph Mini.

Tannoy Autograph Mini - grill off

Tannoy Autograph Mini - grill on

One would shun this type of placement or setup since it is placed on a shelf with no proper speaker placement at all. Also, the 0.7W output would be so under-powered for Tannoy Autograph Mini. Before you comment on all these, please bare in mind that this is just for casual listening, and therefore is just simply placed merely for convenience and ease of use. 

If you know him, seen and heard his real setup, you would be amazed by his masterpiece and how well it is setup meticulously to the very last details. He is one of the audiophile that I truly respect and praised.

Some background of Nightshade Miniamp is below:

Nightshade Miniamp introduction:
http://jandkaudiodesign.blogspot.com/2014/04/nightshade-miniamp-5687-gz32.html

Some experience of using Nightshade with difficult loads:
http://jandkaudiodesign.blogspot.com/2014/05/nightshade-amplifier.html

J&K Audio Design
10/7/2015

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.