5670 driver tube rolling options

[Raymond P.]

Just rub the "E" off the glass if you happen to have them.   

LOL! I may just do that, because I'm really confused now. Turns out my ebay order is for another possible variant - the 6n3p-ev. Can't find any datasheet on the internet, but the listing states that a datasheet is included, so we'll see. Keeping my fingers crossed.

[Tom-s]

EV = EB means long life, high reliability, whereas E is long life.
Has nothing to do with maximum ratings.

See http://www.jogis-roehrenbude.de/Russian/russ_roehre_rue_dat.pdf

Edit: I've been collecting all tubes needed for BH amps and my 2C51 collection has 6 different build types at this point, WE, Tung Sol, Bendix, GE, Raytheon, Sylvania. Now i just need to buy a Kaiju to try them all.
Question. Are there any ancestor tubes for 2C51, like E88CC that work in Kaiju?

[Paul Joppa]

I don't remember where I found it, but this is the one I was reading:

[Raymond P.]

I found that one too. It shows the 6n3pe boast a life time of 5000+ hours. I wonder if that's predicated upon the data sheet specified max plate voltage of 160V. In other words, the manufacturer wants to market a 5000+ hr tube and does it by saying "don't apply more than 160V on the plate", all the while it's identical to the non "e" versions in every way.

[Raymond P.]

Got my pair of 6n3p-ev's and listened for a few days. Here are my quick impressions on them compared to the 5670. First, they seem to work fine, nothing blew up.


The 6n3p-ev's treble seems a bit smoother, slightly less sparkly. The mids sound very similar, can't detect any differences. The bass is not as impactful as the 5670. It actually sounds more neutral. I can live with either of these tubes, but a more ideal tube would be one with the 6n3p-ev's treble and 5670's bass. In the end, I'll probably put the 5670's back. I do prefer a stronger bass.