UV201 & UX201A are older versions of 01A. Use the setting for 01A. If you don't have that, test as #26 with 5 volts on the filament.
Norm
: Could some one Please help. Need settings for Ux201a and uv201 to test on a NRI Model 71 Tester. They are not on my scoll chart. Thank you.
Thank you for your response. Model NRI 71 pro has 17 voltage settings but 5 volt is not an option. 4.2 or 6
being closest. There's 3 other knobs that have to be set to someting. 01a is not on the scroll. Still lost.
What filament voltage is called out for 5Y3 and 5U4? These are both 5 volt filament tubes. You can use the same filament setting.
Do you have a 4 pin socket on the tester? Does the scroll have 30 or 26 tubes listed? Set up the tester for 26 or 30 then use 4.6 volts for filament, or whatever is called out for 5Y3. You will get a reading. If marginal the tubes will still be usable.
Norm
: : Could some one Please help. Need settings for Ux201a and uv201 to test on a NRI Model 71 Tester. They are not on my scoll chart. Thank you.
: Thank you for your response. Model NRI 71 pro has 17 voltage settings but 5 volt is not an option. 4.2 or 6
: being closest. There's 3 other knobs that have to be set to someting. 01a is not on the scroll. Still lost.
: What filament voltage is called out for 5Y3 and 5U4? These are both 5 volt filament tubes. You can use the same filament setting.
: Do you have a 4 pin socket on the tester? Does the scroll have 30 or 26 tubes listed? Set up the tester for 26 or 30 then use 4.6 volts for filament, or whatever is called out for 5Y3. You will get a reading. If marginal the tubes will still be usable.
: Norm
: : : Could some one Please help. Need settings for Ux201a and uv201 to test on a NRI Model 71 Tester. They are not on my scoll chart. Thank you.
: : Thank you for your response. Model NRI 71 pro has 17 voltage settings but 5 volt is not an option. 4.2 or 6
: : being closest. There's 3 other knobs that have to be set to someting. 01a is not on the scroll. Still lost.
All 10 said replace. Thank you for your time and interest.
Do the tubes read anything or are they dead? If they have some reading leave them lit in your tester with higher filament voltage, 6.3 volts. After a period of time, 30 min or so, test them again.
201A's have thoriated tungsten filaments. Thorium may be off the surface. Operating the filament at higher voltage, heat, can drive more to the surface and increase emission.
Norm
: : Hi Larry
: : What filament voltage is called out for 5Y3 and 5U4? These are both 5 volt filament tubes. You can use the same filament setting.
: : Do you have a 4 pin socket on the tester? Does the scroll have 30 or 26 tubes listed? Set up the tester for 26 or 30 then use 4.6 volts for filament, or whatever is called out for 5Y3. You will get a reading. If marginal the tubes will still be usable.
: : Norm
: : : : Could some one Please help. Need settings for Ux201a and uv201 to test on a NRI Model 71 Tester. They are not on my scoll chart. Thank you.
: : : Thank you for your response. Model NRI 71 pro has 17 voltage settings but 5 volt is not an option. 4.2 or 6
: : : being closest. There's 3 other knobs that have to be set to someting. 01a is not on the scroll. Still lost.
: All 10 said replace. Thank you for your time and interest.