I read somewhere though that Larry Carlton uses (old?) Sovtek 5881's in his Dumble(s). I assume the Sovtek would be a better bet then?

'The Tube Store' says the following:

I'm thinking of trying the 5881, EL34 next to the standard 6L6... as the 5881/EL34 would give a tighter low end... which what I'm searching for.

I did get a chance to use my JJ's and winged c's again. I felt in my amp the JJ's sounded worst. Some frequencies seem to stand out a bit (For instande when I play a c on the b string). The sound isn't well balanced.
The Winged C's are well balanced and even. They sound better at 39 then a 34 mV. For my tatste they are very direct and uncompromising, they lack a bit of " sweetness". They Sovtek 5881 (new) are warmer sounding.

I'll keep you posted on the Tung Sol 5881's. I didn't realise they are for 400V max. I think the OTS runs on 450V. Some people here seem to get good results though.

The datasheet for the 5881 say the max rating for the tube is 23 w.

That means with 440 plate voltage a amp is biased hot with 36mA.

OK first impression of the Tung Sol 5881's:
Biased and 35 and 33 mV
There is a very fanit hum even with the volume turned down all the way.
That's the only nagtive thing I have found so far. These tbes sound nice and warm and round. I could imagine a good choise with an overly bright amp. They tubes are not as direct (in your face) and tight as the SED Winged C's and sweeter sounding then my JJ's.

I'd say the Winged C's are a bit brighter and more open (more balanced in all frequencies perhaps), but I don't like them that much because they sound a bit to hard for me. The Tung Sols are sweeter and Jazzier. Nice OD as well.
Must confess I have tried them only for a bit and only in my house so not VERY loud.

I like them a lot. I thing (not sure cause I can't A/B them) they are slightly less dark then the Sovtek 5881's). My guess is that if you like 5881's these are great.

If you like a very direct tight tone you might wanna try the Winged C's. They are louder as well.

Just my, non expert, first impression
Great
Steven

ps. I wrote the supplier several e-mails and he said the voltage probably wouldn't be an big issue. (these are rated for 400V and people have told me my OPTS is about 460V)

Tung Sols.
Yeah Biasing is easy with the OTS. There's a Maual here somewhere.

Tonequest:
     I wouldn't say the TAD's are darker, they just seemed to slightly dull the sharpness and maybe fatter would be appropriate. A little more 3D.  Can still sound pretty aggressive but a little more refined. Hard to describe but I hope you get the idea. I need to learn how to post sound clips and buy recording equipment.

Dennis

IMO the TAD 6L6WGC's has less highs and lows than a 6L6GC which has a broader spectrum with lots of highs and lows. With a WGC you get the feeling of more mids but I think they are just more "narrow" sounding.
Andy Fuchs uses the TAD 6L6WGC in his ODS amps from a post some time ago.