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Tube Primer
Excessive Rolling
Basic Tube Facts
NOS Gassiness
- Ref: Out of box @ -8.5vdc Sum of each triode tested individually
- 0 min: Both triodes enabled
- 30 min: Both triodes after 30 minutes
- 20 hrs: Both triodes after ≈20 hours on heater only.
Socket Retension
When there's a problem, someone always recommends retensioning tube sockets.
In decades of tube amp ownership, never found it required.
Octal KT88 / 6550 / 6L6 style tubes have pins about 0.095" diameter. A 3/32" drill is 0.09375" diameter, the perfect 'go-nogo' checker. If the shank end of a 3/32" drill does not slide easily into the pin socket, the socket does not need retensioning.
Nonal tubes have 0.040" diameter pins. A #65 drill or #19ga solid wire make good go-nogo checkers.
With a set of Gauge Pins, you can select the exact 0.001" required.
Matching
Power Output
6550/KT88 vs KT120
Plate Curves
Click thumbnails for a larger image.
ESC or Click Upper Right 'X' to close.
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