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Ruby Tubes 12AX7 High Gain Preamp Vacuum Tube (HG)

4 models to choose from:
Expertly manufactured, the Ruby 12AX7AC5 Preamp Vacuum Tube offers unparalleled quality and performance for all your audio needs. Upgrade your sound today with Ruby.
Ruby Tubes minature dual-triode vacumm tube with high voltage gain is available in four versions to suit your application:
HG: Ruby Tubes' Standard Rating of High Gain for high gain circuits
HG+: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits
HG+ 123: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. The 123 Variation provides a tube where triode side A tested with premium test results.
HG+ 678: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. The 678 provides a tube where Triode side B tested with premium test results.
Ruby Tubes minature dual-triode vacumm tube with high voltage gain is available in four versions to suit your application:
HG: Ruby Tubes' Standard Rating of High Gain for high gain circuits
HG+: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits
HG+ 123: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. The 123 Variation provides a tube where triode side A tested with premium test results.
HG+ 678: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. The 678 provides a tube where Triode side B tested with premium test results.
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