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Electro-Harmonix KT90 – Upscale Audio
https://upscaleaudio.com/products/electro-harmonix-kt90
Electro-Harmonix KT90 The Electro Harmonix KT90-EH tube is a drop-in for any KT88 or 6550 tube... bias your amp just as you would a KT88 and you're good to go! Sonically they are true to the Electo Harmonix brand; clear top end that is open but not bright or tizzy, tight bottom end, and a clear midrange that is not hard or clinical. They are not a super warm tube. Pricing above …
6550 vs KT88 vs KT90 - High-End Audio Discussion Forum
https://forum.audiogon.com/discussions/6550-vs-kt88-vs-kt90
Use these if you are searching for the "classic" tube sound. Warm, euphonic, less control of the bass frequencies, etc. Svetalana EL34 are the warmest, followed by JJ EL34, then by JJ E34L. In general order from warm(and sweet) to neutral: EL34, E34L, KT88, KT90, 6550.
KT90-ELECTRO HARMONIX - Watford Valves
https://watfordvalves.com/product_detail.asp?id=1251
The KT90 was originally introduced in the early 1990s by the E.I factory. These early examples were not compatible with KT88 or 6550 as they were a modified TV sweep tube, namely a 6KG6. Then in the mid 1990s E.I did make a version which was compatible with the KT88 & 6550. This valve did find favour with audiophiles for its openness and dynamics and solid bass. Sadly, The …
500 watt monoblock power amplifiers KT90 tubes
https://www.ttvjaudio.com/Manley-Neo-Classic-500-p/man0000077.htm
Best regards, Geoffrey Wyshak". Features and Specifications. Manley 500 Watt Monoblock. ALL-TUBE monoblock design 10 x KT90EH Electro-Harmonix Russian output tubes. High current double 6414W GE driver stage. 12AT7EH large plate Electro-Harmonix Russian input tube. BALANCED & UNBALANCED inputs. MUTE switch.
Mingda MC368-BLP Tube KT90 Class A ... - China-hifi-Audio
https://www.china-hifi-audio.com/en/meixing-mingda-valve-amplifier-c-17/mingda-mc368-blp-tube-kt90-class-a-single-end-intergrated-amplifier-phono-lp-mm-p-1525
Use a special KT90 Class A circuit to output dual-channel 18W, electronic tube rectification, to ensure a high degree of reproduction of the amplified tone, beautiful and pleasant. 4. A dual-purpose machine, is not only an excellent Class A amplifier, but also a high-quality phono amplifier, from the turntable audio input to the power amplifier ...
Ei KT-90 Rare Type 2 matched quad. Test NOS. Spare ...
https://audioasylumtrader.com/ca/listing/Tubes/Ei/KT-90/Rare-Type-2-matched-quad.-Test-NOS.-Spare-included.-Free-US-PayPal-and-ship/219985
Vintage Ei KT90 quad plus one spare (5 tubes). Vintage Ei KT90 matched quad. All with the type 2 heavily spot welded plates and silver tab w/black square. Most say that this rare version of the Ei KT-90 is the best sounding. ONE TUBE HAD MISSING GUIDE PIN. I HAD MARKED THE GUIDE PIN LOCATION. Made in the former Yugoslavia.
EL156/KT88/6550/KT90 then KT120 Single Ended …
http://www.single-ended.com/EL156amp.htm
One thing KT90 are not so good sounding for Single Ended.originally KT90 is same spec of TV horizental final(PL509) valves so not for Audio valve.static charactor is good but sound is not same as KT88 and EL156(China). Hatt Audio Laboratory Japan --Audio Transformer Factory--Compatible Amplfier Circuit for KT90/KT88 and EL156 China
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