CED 7025 /12ax7 ?

[colin.hepburn]

Hi All
What do you now about this valve a CED 7025 /12ax7 also known as an E7GC7 well here’s my review on this one up ageist the mullard ECC83 /12ax7) at £40.00 ish and the Marconi B339 £65.00 and the 7025 8 quid this valve is as good in every way that the other two I have listed hear in my 12B4a headphone Amp the 7025 just doses its thing and works with jazz/blues but any one know it s history

[Paul Barker]

useful, ta.

[colin.hepburn]

Hi Paul
this is just in my MHOP on this valve but was hoping for a bit more feedback than useful, ta.
thanks Paul

[Paul Barker]

Not had one, theres an unusual thing.

[colin.hepburn]

Hi Paul
Here you go if you want some the valve in the image is not the 7025
http://www.cricklewoodelectronics.com/C ... =23&page=1

[Andrew]

Hi Colin,

Is this NOS or new. The site doesn't give too much away can you see who made it?

cheers,

-- Andrew

[Paul Barker]

t's listed in Vade-Mecum, as American equivalent of ECC83.

Other equivalents

B339
ECC803
ECC893S
E83CC
M8137
QB339
6L13

12ax7
12DF7
12DT7
6057
FF6057
6681
7729
same pinout slightly different performance
12bz7 1.5 watt instead of 1 watt greater filament to cathode potential allowed
Diff pinout
2C52
E283cc
12AK7
7058
diff pinout slightly different performance more s similar mu so lower r
6h2pi
6cc41

[colin.hepburn]

Yes that site isn’t too informative all I can say is it’s labelled as CE not CED. E7GC7 7025/12AX7WA made in Russia by Sovtek 0406 no other markings on it
This link shows the valve but not much info http://www.elderly.com/accessories/items/12AX7WA.htm

[Andrew]

OK, I know it, it's a re-badged modern Sovtek ECC83, I think this was originally derived form their 6N2P.

I've used these and the EI Elites, quite good value for money, the 83 is probably OK in a headphone, I have used them in gain stages for my 300B, better when self loaded.

cheers,

-- Andrew