Tube Testing
Every Tube is tested for Shorts, Grid Emission & Gm (mutual conductance) on an upgraded and callibrated B&K 700 & 707. The number is marked as Gm on your tubes. For most tubes NOS (new old stock) = a nominal 100 or 100%, however, depending on the tube it can range from 80 – 120. I only sell good testing tubes – period.
Power Tubes are further tested for emission on my custom power tube tester at normal operating voltages for that tube. This number is marked as mA on your tube and means plate emission in milliamps.
Matching is a Free Service! In fact many tubes are sold as matched sets – pairs, quads etc.
Extended Testing: I specialize in Tubes that I use in my own custom builds, so if you buy any of those tubes, I will put them in circuit and check for noise and sound quality – Testing numbers only get you halfway!
Purchase Guarantee
Vacuum Tubes: If a tube is defective within 45 days of Purchase Date it will be replaced. No Returns or Exchanges.
NO WARRANTY for Commercial Use of Tubes. No Returns or Exchanges
Kit Amps are guaranteed to be complete (except tubes), should you be missing a part or have a defective part, it will be replaced and shipped within 24hrs. No Returns or Exchanges.