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Lawrence
 
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Default 12AX7 and 12AU7 upgrade

Some people told me that a "good" and "no-so-good" 12AX7 and 12AU7 really
make a big difference to the pre-amp and power-amp.

I look at some Chinese 12AX7A which cost about US$12.00 a piece, and a
piece of Tesla ECC803S cost about US$50.00; similar goes to the 12AU7!

I wouldn't mind to pay for the difference, but I want to know if it is
worth paying that?

Can anyone ever tried that can be kind enough to share their experience?

Thanks in advance!

Lawrence