Description

This is a lot of three used 5R4* vacuum tubes which have been tested and are in good working condition. One is a GE 5R4GYA and the other are RCA branded 5R4GB. I have guitar amps that use this type of rectifier and also tested them there. About testing: The tubes were tested on a consumer-grade tube tester which has been calibrated according to its instructions. After one minute of warmup each tube is tested for shorts, leaks, and for general function. Though this tester has proved accurate and reliable enough for testing tubes I use in my own personal devices, please note that this is not a military or industrial grade tester and the results should be considered approximate.