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Electro-Harmonix and Sovtex tubes

I'm a tube newbee so please forgive me if my questions are somewhat elementary.

First of all in a pre-amp what exactly do the 12at7 and the 12ax7 tubes do? I know that each type of tube has a particular function, but not exactly sure what the function of each is.

Second question, I understand that both E-H and Sovtex are both owned by the New Sensor Corp but what wondering from a sonic perspective what are differences between the E-H and Sovtex tubes (12at7 and 12ax7). At present I'm running NOS Sylvanias or NOS RCA 12at7 and Sovtex 12ax7 in my amp (Jolida SJ-502A) but down the line I thinking of getting away from NOS and going to current production stock simply because of availability (E-H/Sovtex tubes seem very available at the local music shops where I live).

Bottom line, I trying to educate myself on tubes (and it can get a little confusing).

Anyway, appreciate any comments.
cleaneduphippy

Showing 1 response by mrtennis

mrtennis
3,295 posts
 
i own eh 12ax7, 12at7, 12ay7 and 6fq7. they are the worst tubes i've ever heard. i spoke to 2 manufacturers who agree with me and refuse to use them in their products.

the only current production i liked was a chinese 12au7 in a chinese tube amp.

most eh tubes i have heard have a nasty upper midrange treble resonse.

i would love to get rid of these tubes if anyone wants them--cheap.
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