26HU5's vs 26DQ5's

[rsumperl]

Greetings everyone,
I biased up a set of 26HU5's to 60ma/per, 500v Eb, 135v G2, 3300 xfmr. All I can say is wow. The sound is really clean and really loud. Even though the DQ5's were good, I feel the 26HU5's are a cut above.
Anyone else play with this tube?


Ray

 

[AmpKiller66]

I know this is an old thread, but as I just came across 12 26HU5s (and 1 26DQ5, incidentally) I thought I'd make an observation regarding this tube. They appear to be identical in construction to a 26LW6 without the cooling fins welded to the ends of the plate, in fact you can see where the ends of the plate are folded over where the fins would be inserted on the LW6. This is just on the GE-manufactured tubes, the one Sylvania I have is identical to a small Sylvania 26LW6, fins and all. The pinout is identical as well, and the differences in the datasheet pinouts aren't there upon real-world observation. I haven't had the opportunity to fire them up yet, but I expect to see similar performance to the 26LW6, with maybe a little less max plate dissipation (compared to a small 26LW6, the big ones will eat all you can throw at it according to Tubelab. Haven't pushed the few I have but they are HUGE! Heavy too.) So... definitely some serious potential here, and probably a bass amp as well lol.

 

[smoking-amp]

26HU5 appears to be the same tube (other than the base) as the 26LX6, for which there are curves:
http://frank.pocnet.net/sheets/123/2/26LX6.pdf

 

[AmpKiller66]

It certainly appears so. And the specs are similar to what few I've seen for the 26lw6. Seems like a common trend among sweep tubes to share the same internals among several tube types for a given brand, especially among tubes that date from the final days of tube production.

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