6LB6 looks pretty similar spec-wise to 6HF5, 6JE6, 6JS6, 6LQ6, 6LZ6, 6LG6.
High current capable at 315 mA Max DC, I would guess 2.5K or 3.3K P-P would be ballpark, but higher Z certainly (using higher B+) possible if you don't want to use that current capability (the sweep tubes are very much rated to go HV if wanted). There is an excellent GE data sheet with curves to try out loadlines on.
http://scottbecker.net/tube/sheets/123/6/6LB6.pdf
A moderately expensive tube to buy replacements for though. $24 With no higher filament Volt versions available (cheaper).
6LG6 looks to be its slightly smaller brother, and only $4 (21LG6).
High current capable at 315 mA Max DC, I would guess 2.5K or 3.3K P-P would be ballpark, but higher Z certainly (using higher B+) possible if you don't want to use that current capability (the sweep tubes are very much rated to go HV if wanted). There is an excellent GE data sheet with curves to try out loadlines on.
http://scottbecker.net/tube/sheets/123/6/6LB6.pdf
A moderately expensive tube to buy replacements for though. $24 With no higher filament Volt versions available (cheaper).
6LG6 looks to be its slightly smaller brother, and only $4 (21LG6).
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