Tubes

Taste Tests

• Mook's Taste Tests of various tubes
• Jeff Morris's 12AX7 and 6L6 comparisons
• Miles's Snack & Taste Tests

Tube FAQs

• European Tube Numbers (How to read European tube designations)
• USA Tube Numbers (How to read USA tube designations)
• Dual Triode Specs (Useful for substituting between 12AT7, 12AX7, etc)
• Blue Glow FAQ (My tubes glow blue; are they burning up?)

Tools

• Tube Circuit Gain Calculators
  1. From AX84 Project Theory Doc
     uses Plate resistance, Plate load resistor, Following grid resistance, Transconductance (in uMHOs) and Cathode resistance
  2. From Circuit Analysis of a Legendary Tube Amplifier: The Fender Bassman 5F6-A, Second Edition by Richard Kuehnel
     uses Plate resistance, Plate load resistor, and Tube amplification factor (mu), with optional cathode resistor and bypass cap
  3. As above, plus graph
  4. From RCA Receiving Tube Manual RC-22
     uses Plate resistance, Plate load resistor, and Transconductance (gm)

Does the truth hurt?

• You might be a tubeneck if...

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Last updated: 23 December 2008

Copyright 1999, Y2K, Y2K++, Y2K4 Miles O'Neal, Austin, TX. All rights reserved.

Miles O'Neal <meo@XYZZY.rru.com> [remove the "XYZZY." to make things work!] c/o RNN / 1705 Oak Forest Dr / Round Rock, TX / 78681-1514