With the emergence of XL size direct heated Triodes like KR 300B XLS, EML 300B XLS, EML 1605, EML 320B XLS, EML 520B, the demand of high quality and decent priced XL size output transformers dedicated for large direct heated Triodes is rising.
The standard ALIS-5SE, ALIS-5SE MK2 or ALIS-5SE Ultimate that are made for generic 300B could not longer be optimal for such tasks with the KR or EML series of large direct heated Triodes. They are still usable if the idle current is set to 80mA - 100mA but if one really needs to fully optimize the large Triodes, they need to bias it hotter and higher.
For those that are unaware of the ALIS series output transformers, you can refer to the URL below:
ALIS Output Transformers
Previously, the only option to use KR 300B XLS or EML 300B XLS and the likes will be to order customized OPTs that is drastically more expensive (>U$1,000). We have heard you pain, and we have decided to upgrade the ALIS-5SE Ultimate to another level higher.
With this, we would like to introduce the ALIS-5SE Paragon! The ALIS-5SE Paragon is redesigned and redefined to meet the KR 300B XLS, EML 300B XLS or EML 520B Triodes needs. ALIS-5SE Paragon comes in 2 flavors, the EI version and the Nanorcystalline version.
* ALIS-5SE Paragon EI(Z11) - U$690 / matched pair (Level 1)
* ALIS-5SE Paragon DC (Nanorcystalline Dual Core) - U$1390 / matched pair (Level 3)
ALIS-5SE Paragon transformers retain all the Ultimate goodness and boast higher output power. Some highlights below:
* 300B XLS: 9-70kHz +0/-1dB), 15-45kHz +0/-0.5dB * Equal or better Pri. DCR: 82.5 Ohm(B-P2.5K); 97.5 Ohm(B-P3.5K)
* Primary Current: 130mA recommended (160mA max)
* Cores - EI 105, EI 113 or Nanocrystalline C
The Paragon version couples old school output transformer making "technology" with modern day transformer making theories, materials and design. We merged the reference book design with our technology and came up with optimized design that is low loss, low DCR, wide bandwidth and ultra linear frequency response! Measurements reflects what a reference books show under ideal cases. This is how good they are.
Try it to believe.
Happy New Year!
J&K Audio Design
3/1/2015
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