Driver/Input tubes

Stupid questions coming up. Does this mean that it is a must for the 12AT7 and 12AX7 tubes to be matched (each triode of the preamp tube has matching gain) and balanced (when the plate current draw of each triode is the same)for the Jolida 502P? I found that some tube sellers add a surcharge for this service.

Jedinite, you don't have to match 12AT7 or 12AX7 at all.

Jed,
If you are asking about matching the AT7s to the AX7s, then no. If you are asking if you should have matching AT7s (or AX7s), then I'd strongly recommend it (not absolutely required, though).

Hi Marakanetz and Batch68

From seeing the tubes that came with the Jolida 502P I see I don't have to have matching 12AT7 and 12AX7 tube brands. It came with EH 12AT7 tubes and Tung Sol 12AX7 tubes. I normally like having uniformity all around but hey if it is ok for Jolida it should be ok for me.

I was wondering about the necessity of matching the gain of each triode of the preamp tube as well as the plate current draw of each triode being the same.

Here are some examples. Please see the Options check boxes

http://www.dougstubes.com/preamp-tubes/12at7-ecc81/penta-12at7.html

http://www.dougstubes.com/preamp-tubes/12ax7-ecc83-7025/penta-12ax7.html

If matching isn't necessary I was just going to go to the music shops by me and get the Groove Tubes equivalent of these tubes. They aren't matched at all from what the associates tell me.

Thanks again for the help.

Maybe Atmasphere will see this thread and post a reply;if he does you can not get any better information in my opinion;also advice so far has been pretty good.