Winged C (SED) 6550C Vacuum Tube, Matched Quad

Svetlana 6550 Tube Medium/Green Quartet

Svetlana 6550 Tube Hard/Blue Duet

Svetlana 6550 Tube, Soft/Red Duet

Svetlana 6550 Tube Medium/Green Sextet

Svetlana 6550 Tube Hard/Blue Quartet

Svetlana 6550 Tube Medium/Green Duet

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6550 Tubes Svetlana Popular Q&A

Q: Who invented the 6550 power tube?
A: Lee de Forest Read More »

Q: How do I test svetlana tubes for an amplifier?
A: Unless you have a tube tester that can apply full plate voltage to the tube, you won't be able to fully test them. If you have a DMM, I suppose you could make s... Read More »

Q: What is the bias setting for a 6550 tube in a diezel herbert guit...
A: Bias setting for Diezel Herbert: EL34: 60 mA per pair; 6550: 80mA per pair; Diezel recommends to use EL34BHT or SED (Svetlana) =C= EL34s. report this answer. Up... Read More »

Q: What's a good 6550 power tube amp?
A: 6550s are capable of huge power, so they're generally reserved for Bass amps...the SVT used 6 of them to crank out 300 watts. I recall vaguely that Zakk Wylde u... Read More »

Q: So, what's YOUR power tube preference? EL34 or 6550?
A: This is another good site for tube info. It seems that everyone has a slightly different opinion in regards to the best tubes. I retubed my TSL601 with Tung-Sol... Read More »