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In Reply to: RE: Once In A Lifetime Find KT88's From 1956 & 57 posted by firstname.lastname@example.org on February 17, 2017 at 17:37:49
I have never had a pair of the brown base, but I have had a few of the metal base (I still have one used pair somewhere).
Be careful with those tubes - based on the original literature they are not rated as high as the more "common" version - a maximum rated plate voltage of 600V (as opposed to 800V for later versions), and a maximum anode dissipation of only 35 watts (as opposed to 42 watts for later versions).
I sold a group of five new in box a couple of years ago, and the price was high but not as high as you would expect. While there are a handful of pure collectors, most will not pay that high dollar. The rest are either users or resellers (mainly from Asia). Because the tubes are very scarce, they are tough to match and people really want a quad (for push pull).
Thanks for the information. I figure since there are 2 sets they would be perfect SE application.
All 4 tubes above were made in October 1956.
I would not be at all surprised if you have 2X reasonably well matched pairs. In an amp with 4X individual bias adjustments, like the H/K Cit. 2 (AKA "Deuce"), you would be just fine.
What sort of speakers are you planning on using?
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