Originally Posted by
tunghaichuan
Just as I suspected. Those are 6П3С-EB (In Cyrillic, 6P3S-EV in Latin) tubes. They are rebased Sovtek "5881" tubes. The first 6П3С-EB tubes exported from Russia back in the early 90s had a coin base and were labled "5881." They were nothing like a real Tung-sol 5881. Nor were they like a 6L6GC. Rather they were just similar enough to use in 6L6 circuits. At the time, they were a godsend because GE had shut down their factory in Kentucky and it was the first time a 6L6 type tube wasn't in production since the 1930s. Sovtek then began to have the same tube manufactured with a full-size base (identical to yours) so that the claws in Fender amps could grip them. The coin based tubes didn't fit in Fender amps right. Sovtek relabeled the tube 6L6WXT. The WXT suffix is a tip-off: no real Western-made tube had this suffix, and it is meaningless under the Western tube designation scheme...
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