Hi All,
Through the years I know most power tube makes but picking a box up from flea market, who made this version of 6550 with a pellet getter. Is it Sovtek or another ? There is not an origin mark or clue on the glass, but certainally Russian origin. The ones I tried on the jig varied enormously. I hate tosay this, but they seem like redressed 6L6 variants, as anodes start glowing at 30W.
Any ideas ?
Bench Baron
Through the years I know most power tube makes but picking a box up from flea market, who made this version of 6550 with a pellet getter. Is it Sovtek or another ? There is not an origin mark or clue on the glass, but certainally Russian origin. The ones I tried on the jig varied enormously. I hate tosay this, but they seem like redressed 6L6 variants, as anodes start glowing at 30W.
Any ideas ?
Bench Baron
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Thanks
With no upper glass gettering, the raw stucture looks boring, but I will deliberately run some tubes into the red anode zone and see if the characteristics stabilize, as is often the case.
Svet´s should be reliable but one never knows. To compare I have some early Svet 6550B version tubes and they can handle to the spec sheet. These produced very low distortion, interesting to compare.
BB
With no upper glass gettering, the raw stucture looks boring, but I will deliberately run some tubes into the red anode zone and see if the characteristics stabilize, as is often the case.
Svet´s should be reliable but one never knows. To compare I have some early Svet 6550B version tubes and they can handle to the spec sheet. These produced very low distortion, interesting to compare.
BB