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Help with info on Original Genalex KT66

Posted on May 4, 2012 at 21:03:28
Posts: 3
Location: Illinois
Joined: October 6, 2010


Does anyone know any specifics about these Genalex Gold Monarch white print KT66- I am wondering when they made these (what years) and just any info anyone has on these specific tubes is appreciated- Thanks- Barry


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RE: Help with info on Original Genalex KT66, posted on May 5, 2012 at 19:32:47
Michael Samra

Posts: 35874
Location: saginaw michigan
Joined: January 30, 2005
June 24, 2005
Those are the Monarch series and they made in the 70s to early 80s,the ones you have.I will be honest with you,the smoked gray bottles are my favorite because they rich in sonics and have the RCA black plate sound.You can get a pretty penny for those on ebay and I can almost bet,you will like the reissues as well or better because they are that good..The tubes you have are rated to 450v and you can run them at 500v without arching risks.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken


RE: Help with info on Original Genalex KT66, posted on May 6, 2012 at 01:58:58
Bored Member

Posts: 12664
Joined: July 31, 2007
May 17, 2009

The infomation is included in the data sheet with each tube. Something that most British made GEC/MOV Gold Lions came with. BTW... I agree with Mike, the gray glass KT-66's are absolutely one of the best output tubes ever made. Esp at this power range.

Some KT-66 came with a four-digit number stamped on the plates. Like:

"8011" = 1980, 11th week.

But, not all KT-66 made had this dating.

Compared to RCA black plate 6L6GC the KT-66 really has an agressive tone with a very clean bass and high end. Maybe, not the rich harmonic of the RCA. Both are excellent tubes, when you can find a good NOS or high testing, quiet pull.

The KT-66 kinda reminds me of the original regular-based Sylvania 7591A. If you are familiar with that tube. With a better midrange than the 7591A (if it's a gray glass).


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