The Penta Laboratories 572B is a power triode designed for use as a RF Oscillator, Amateur Radio RF Power Amplifiers and Audio Frequency Modulator.
The 572B is a direct replacement for the 811A, but has a Graphite Anode for increased performance and reliability.
All Penta Laboratories tubes are burned in before testing and matching at their Testing Facility in Ventura, California.
New Current Production
** No returns, however Defective Tubes will be replaced free of charge for 13 months**
Product is manufactured by affiliated or unaffiliated manufacturers in various countries. Country of origin is printed on the tube.