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In Reply to: RE: Take on VT-25 / 801 / VT-62 / 10 Tubes? posted by megasat16 on January 10, 2017 at 11:40:19
Thoriated tungsten filament tubes (10 family):
210/10/10Y/VT-25 (1602 is selected VT-25);
801/801a/VT-62 mas more power capability (1608 is the robust uncle of 801a, but not as linear as little brother, only use for B class power amp);
VT25A has oxide coated filament, larger anode than VT-25.
For preamp - 10...25mA - each of them (except 1608) are excellent tubes.
Globe 210 is the oldest (rare and the most expensive).
10 and original 801 has lower voltage tolerance, thus lower power capable tubes, 10Y and 801a are the improved versions.
I use/used all of them (except 210 and 1602).
I prefer thoriated tungsten tubes, old type 10 and graphite anode 801 as preamp, 10Y as driver and 801a as power tube.
Follow Ups:
It's hard to go wrong with any 10 variant, I have tried most of them. A few points:
1608 is a high-mu version of the 2A3, not related to the 10 family. 1602 is a selected 10, fairly rare but mostly just a grading designation, no real construction differences. the 841 and 842 are high- and low- mu versions of the 10, respectively. Both are fairly uncommon though the 842 is the rarer of the two.
There's also mesh plate globe varieties, which are probably the rarest of the actual 10 types.
The UV-202 is the real parent of the line, and predates the globe 10 by a fair bit. Higher filament current and slightly different base (UV4 vs UX4) but otherwise similar enough that it could be tried in place of a 10 with some caveats.
-Ed
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