Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

: (Corrected to 1926). Well I have moved from successful restoration of 1930 Model 66 Radiola to 1926. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Hi Jeff

Use the setting for #31 tube and increase filament voltage to 3 volts. A marginal reading is still ok.

Norm

: Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Hi,
1) Unless you have a position setting for type #20, and short of someone having the knob settings, you can get really close by using the settings for a type 31, BUT set the filament voltage to 3.3 volts.

2) There is the little red lettered shortcut up at the top.

: Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

John,
I. Thanks for the test information.
II. The shortcut at the top takes a long time and it seems like you end up at the bottom of the page. All postings must load on the browser. To be sure, I am not a Webmaster, and will stick to antique radios.

: Hi,
: 1) Unless you have a position setting for type #20, and short of someone having the knob settings, you can get really close by using the settings for a type 31, BUT set the filament voltage to 3.3 volts.

: 2) There is the little red lettered shortcut up at the top.

:
: : Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: : Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Gentlemen,

I found a 20 on the obsolete tubes list for the Knight 600C. It calls for a filament setting of 6.3 volts. I also have the 31 and it says 2 volts (one of you said use 3.3 for this setting). I have 3 volts and can check the actual voltage with a meter. Do you feel that the 20 is the same as a 120? If so which setting of the two (20 or 31) is best?

Thanks
Jeff

Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Do not use 6.3 volts! Set your filament to 3 or 3.3 volts. Yes, 20 and 120 are the same. Use this setting. If you didn't have it, setting for 31 will work with increased filament to 3 or 3.3 volts.

Norm

: Gentlemen,

: I found a 20 on the obsolete tubes list for the Knight 600C. It calls for a filament setting of 6.3 volts. I also have the 31 and it says 2 volts (one of you said use 3.3 for this setting). I have 3 volts and can check the actual voltage with a meter. Do you feel that the 20 is the same as a 120? If so which setting of the two (20 or 31) is best?

: Thanks
: Jeff

: Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: : Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Norm,
I corrected my tube chart and tested at the 20 settings except at 3 volts. The only difference between the other settings for the 31 and the 20 is the "load factor". The 31 is at 48% and the 20 is a 40%. The tube tests at around 28 out of 100 on the 31 setting, and reducing the load on the 20 setting gives me around 23%. I am not sure if this is still considered in the marginal or below for this old tube. It is reading in the replace section on the meter.
Thanks
Jeff

: Do not use 6.3 volts! Set your filament to 3 or 3.3 volts. Yes, 20 and 120 are the same. Use this setting. If you didn't have it, setting for 31 will work with increased filament to 3 or 3.3 volts.

: Norm

: : Gentlemen,

: : I found a 20 on the obsolete tubes list for the Knight 600C. It calls for a filament setting of 6.3 volts. I also have the 31 and it says 2 volts (one of you said use 3.3 for this setting). I have 3 volts and can check the actual voltage with a meter. Do you feel that the 20 is the same as a 120? If so which setting of the two (20 or 31) is best?

: : Thanks
: : Jeff

: : Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: : : Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!

Jeff

Go with it. Your tube has a good filament and enough emission to work. It will be hard to find a 120 tube that reads very high.

Norm

:
: Norm,
: I corrected my tube chart and tested at the 20 settings except at 3 volts. The only difference between the other settings for the 31 and the 20 is the "load factor". The 31 is at 48% and the 20 is a 40%. The tube tests at around 28 out of 100 on the 31 setting, and reducing the load on the 20 setting gives me around 23%. I am not sure if this is still considered in the marginal or below for this old tube. It is reading in the replace section on the meter.
: Thanks
: Jeff

: : Do not use 6.3 volts! Set your filament to 3 or 3.3 volts. Yes, 20 and 120 are the same. Use this setting. If you didn't have it, setting for 31 will work with increased filament to 3 or 3.3 volts.

: : Norm

: : : Gentlemen,

: : : I found a 20 on the obsolete tubes list for the Knight 600C. It calls for a filament setting of 6.3 volts. I also have the 31 and it says 2 volts (one of you said use 3.3 for this setting). I have 3 volts and can check the actual voltage with a meter. Do you feel that the 20 is the same as a 120? If so which setting of the two (20 or 31) is best?

: : : Thanks
: : : Jeff

: : : Well I ahve moved from successful restoration of 1930 Model 66 Radiola to 1925. I am now working on a Model 25. I have tested the chassis per service notes and now wish to test the tubes. It is more of a challeng eto find information on these old battery tubes. My Knight Model 600C will test the UX 199 tubes under X99 on the obsolete tube chart. I cannot find any listing for the UX 120. I looked on the tube substitution section of the site. No luck. Can anyone tell me how to test this final stage tube? I also have access to an NRI Model 70 if that helps. Your assistance is much appreciated.
: : : : Question II. Why is the post a message at the bottom of the page. It takes a long time for modem based access to get to the bottom. Can it be moved to the top? Thanks!