Good day folks! We
have been quite quiet these days on the blog, but we aren’t dead!
Things are moving
at a very fast pace at the background to fulfil all the orders. Apologies if
your orders take such a long time. Lead time is long to maintain the quality of
the products. If you are in a rush, please submit your orders early, or go
somewhere else please if you’d like to rush things. I’m sorry we cannot take
rushed orders. Thank you for your patience in advance, and your support all
these years. We cannot make it that far without all your love and blessings on our
products!
For those that
prefers more frequent updates, they can visit our Facebook page where we frequently
post about our product news, and interesting HIFI related topics. We welcome
your emails to discuss about anything related to HIFI or audio transformers
with us. We are open to partnerships or ODM for your equipment needs. Just drop
us a mail.
For this round, we would
like to introduce you guys to our Super Hi-B EI core. I believe all would be
familiar with the EI Z11 core used all over our standard offerings, which is considered
quite high quality compared to the lower H cores used elsewhere. The Super Hi-B
EI core is even better.
The Super Hi-B EI
core have higher permeability and lower core loss (~35% lower than EI Z11). Super
Hi-B EI core loss is only ~0.92W/KG (versus ~1.25W/KG for EI Z11)! We have been
experimenting on using this core on the most commonly used 300B output transformer
and got excellent results. Based on all similar design parameters, with just the
difference on the core material, Super Hi-B EI versus EI Z11, the Super Hi-B EI
core boasts 20% higher primary inductance compared to EI Z11. This has opened a
door for a better output transformer design!
With the lower core
loss and higher inductance generated with the Super Hi-B EI core, we can notice
obvious improvement on the output transformers. The low frequency, in terms of
linearity, extension and quantity, are so much better with the Super Hi-B EI
core compared to EI Z11 version. The control and grip on the speakers are much
stronger, and therefore you can “feel” that the power is higher. There are some
improvement on clarity and transparency too, possibly due to the lower loss of
the core, and the different design approach we take for this core since consideration
or compensation for higher primary inductance is lesser in some degree.
A lot of tube
amplifier users feel that the low frequency fidelity for tubes are not good and
deep enough. They should try to listen to this version with Super Hi-B EI core.
We can easily get low frequency response of 10Hz @-1dB, and more if the users
have special request.
The EI core size
profile is quite complete for this Super Hi-B EI core compared to the C core
version that is limited in sizes, and therefore there are more flexibility in
terms of the VA or capacity, and the ease of more deeper customizations. Super
Hi-B EI core has size of EI 66, 76, 86, 96, 105, 114 and 133.
And yes, to answer
some extreme customers, that these cores can be used as power transformers or
chokes too. And yes again too, for even more exotic users, we can pair this
with OCC Copper or OCC Silver wires, to make the ultimate output transformer
for your project.
Send in your orders
now, and be amazed with the renewed life of your tube amplifiers! Apologies on all
words article – the EI core all looks the same. There is nothing much to see,
but it is much to hear!
J&K Audio Design
27/7/2018
