By Cynthia Tobias. Guitar Electric. Published at Wednesday, August 08th, 2018 - 06:55:32 AM.
The "Svetlana" brand name is now owned by Sovtek. In fact, Sovtek makes a copy of the SED "Winged C" 6l6 which is sold as the Svetlana 6l6. The SED and the Sovtek Svetlana are not the same tube (the getters are different), and they don't have exactly the same tone (the Svetlana is not quite as bright). But the two tubes are very similar, and the Svetlana costs almost half as much.
Before taking a look into the differences of single coil pickups and double coil pickups we need know there are primarily two different types of pickups. They are magnetic picks which is where single coil and doubles coil picks are categorized. The other common pickup is piezo electric pickups. Piezo comes from the Greek word meaning to squeeze. The piezo pickup reacts to vibrations rather than a flux in the magnetic field. In the past the piezo pickups were made of ceramic material however now they are mostly made of polymers. As these pickups work with vibrations and not a magnetic field they will work with any type of strings such as steel, nylon or gut. The string used does not matter. Mostly the piezo pick is used on acoustic guitars being installed in the bridge.
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.
Yet another thing to consider is mixing and matching different speakers in a multi-speaker amplifier. For example, if you have a Super Reverb or Bassman, which has 4 x 10" speakers, you can put two bright sounding Jensens on top (like Weber 10A100's or Jensen P10r's); and then try to balance the sound with two bassier sounding speakers on the bottom (like Weber10A150's or Jensen P10n's). Another popular set up is to have a Celestion G12M on one side and a G12H on the other side of a Marshall Bluesbreaker 2 x 12 amp.
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