1920's Sterling R-402 Tubne Tester Apr 28 Written By Iain This is one of the earliest testers I've seen. It is certainly early as it only test a few early triodes but it looks great. This is currently on eBay. Not affiliated with seller. Sterling R-402 Iain
1920's Sterling R-402 Tubne Tester Apr 28 Written By Iain This is one of the earliest testers I've seen. It is certainly early as it only test a few early triodes but it looks great. This is currently on eBay. Not affiliated with seller. Sterling R-402 Iain