[R-390] Tube Testers

[KA9EGW]

What he said.
73, Brian KA9EGW

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Glenn Little WB4UIV
Sent: Tuesday, September 17, 2013 1:13 AM
To: R-390 at mailman.qth.net
Subject: Re: [R-390] Tube Testers

Your best tube tester is the instrument that you will be using the tube in.
If it works in the circuit, it is good.
Measure the voltages around the tube.
If they vary significantly from the manual, replace the tube.
If this fixes the problem, the tube was bad.
If the problem remains, put the original tube back in and find the bad
capacitor, open coil or out of tolerance resistor.
Most of the resistors will be out of tolerance, high.
Any paper capacitors should be replaced with mylar or similar capacitors.
By definition, the paper capacitors are bad.




73
Glenn
WB4UIV