Published at Friday, August 31st, 2018 - 23:49:49 PM. . By Sarah Broughton.
The second common OEM tube out there is the Chinese Shuguang 12AX7 (Groove Tubes also sells this tube as the 12AX7C; Tube Amp Doctor has also sold this tube as a TAD 7025; and it has also been sold by Mesa Boogie). The Chinese 12ax7's are constructed with short, fat plates, like the Sovteks, but they have an extra spacer above the tubes, a big nickel colored brace connecting the plates, and a "halo" getter on top. Again, if you see a tube made like this, it's a Chinese tube, regardless of whether it has Groove Tubes or Mesa Boogie or TAD written on the glass. These tubes have a warmer tone than the Sovteks and more gain (volume). As a result, they work well in high gain amps.
There are also many different materials used for capacitors. A large portion of mass manufactured guitars come stock with a small ceramic disc caps. Many don’t use the tone control, so they never switch them out. However, for the serious tone-seeker, there are plenty of aftermarket caps available. Metal film, paper-in-oil, and polyesterfoil will each have a different effect on the overall tone of the guitar as well as the response of the tone control. Testing is useful to help find the capacitor that provides the right tone.
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