Guitar Tube – Tube Amp Power Tube – Reissue Vs Vintage
Wednesday, July 7th, 2010
Vacuum tube amplifiers are some of the most sought after amps in the industry due to their warm rich tones. For years people have compared certain types of amp tubes for their sonic richness and warmth. More than that, it seems to be the older vintage models that win most guitarists over for their great guitar tone. The big problem usually occurs when trying to find new old stock tubes, or at least tube that may be similar in its characteristics.
In this article we are going to look at the KT66 power tube. This well respected tube was introduced in the mid 1950′s by the Marconi-Osram Valve Company. They marketed their tubes under the name of “Genalex”. The KT66 was Europe’s version of the American 6L6GC.
The KT66 tube is quite larger than the 6L6 in physical size. It also has quite a big sound to go along with it’s size. The tube was used in the famous Marshall Bluesbreaker Combo in 1965 – 1966. Marshall eventually changed to the more readily available EL34.
If you’re lucky enough to find an original new old stock matched pair of KT66 tubes, you should be prepared to pay around $600.00. This is the current cost of these “original” bad boys.
On the other hand, you can get a matched pair of the reissue Genalex KT66 tubes for a much more affordable price of $99.00. These reissue tubes duplicate the large clear bottle of the UK tube, as well as it’s brown base, gold-ink lettering with prancing lion logo, gold plated screen, and huge plate structure.
The comparison between the original KT66 tubes and the reissue tubes are as follows:
The early original KT66 tubes sounded big and brawny, with extended lows and a very rich and detailed set of mids and highs. Something all guitar players tend to look for in a quality tube. The reissue Genalex KT66 tubes sounds incredibly similar to the original. They deliver an almost identical sense of presentation and focus. They did not seem to drift into the dreaded saggy zone when pushed into distortion. As with the original tubes, the reissues KT66′s overdrive voice is throatier and more british-sounding than the 6L6′s, and they respond beautifully to the changes in picking and volume dynamics.
It’s very easy to see why this robust-sounding tube remains so popular with savvy musicians. With such a great-sounding reissue tube available at only a fraction of the cost of the originals, it’s an attractive replacement for any 6L6 amp that has enough cabinet space to accommodate the KT66′s tall bottle.
As far as long-term reliability of the reissue, it’s hard to say for sure because the superbly made original is a tough act to follow in that regard. However, if you’re interested in getting great guitar tone with the highly acclaimed KT66 power tube, the reissue Genalex model really hits the mark.
I hope this has helped shed light on the highly acclaimed KT66 power tube.
For more information on Great Guitar Tone see details below.
Thank You,
Bob Molton


