27-10-2016, 08:30 AM
In many cases a valve tester won't tell you how a valve will perform in a real circuit. 2 main areas:
1: High power, especially pulse power as found in TV line scan. A tester simply can't simulate these conditions.
2: High frequency. A valve tester is working at or near DC which tells you nothing about how a valve will work at RF.
Many radios etc are very tolerant of variations in valve performance so even a valve that tests badly may work OK.
1: High power, especially pulse power as found in TV line scan. A tester simply can't simulate these conditions.
2: High frequency. A valve tester is working at or near DC which tells you nothing about how a valve will work at RF.
Many radios etc are very tolerant of variations in valve performance so even a valve that tests badly may work OK.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
