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III. Are our vacuum tubes burned in and tested before we ship them out?
YES. Each vacuum tube is burned-in for a minimum of 48 hours dissipating full power with filament, plate and screen voltages that are normally used in amplifier applications. Thus insuring that the various electrical parameters have stabilized and the matching of each vacuum tube will not drift during the life time of each vacuum tube.
Our power tubes are matched within 5% variation on all parameters. We start the process by using vacuum tubes that are tested for bogey values and reject those that are on the outside limits of their design. Each vacuum tube is then tested on our fleet of wt-100a original rca production testers for plate current, screen current and transconductance (gm). We also check for grid current and leakage between elements.

When you receive vacuum tubes from Penta Labs you can rest assured that you are receiving a product that has been thoroughly tested and will perform at levels unsurpassed in the industry.

- Steve Sanett,
Director of New Business Development
Penta Laboratories.
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