Have a PACO T-60 tube testor not working properly. All the tubes test bad though some are in actuality good. Any thoughts as to what might be wrong and where to get a free schematic for same.

:Have a PACO T-60 tube testor not working properly. All the tubes test bad though some are in actuality good. Any thoughts as to what might be wrong and where to get a free schematic for same.

::Have a PACO T-60 tube testor not working properly. All the tubes test bad though some are in actuality good. Any thoughts as to what might be wrong and where to get a free schematic for same.

Come on guys, put your rabbit ears on and see if there are some answers for these questions. Thanks

Well, here's my answer (again, from a 27 year old, so be prepared for disaster). My EICO 625 had your problem when I first got it. All of the resistors had drifted. Since most, if not all, tube testers use a simple network of resistors and such, I suggest that you check the resistors and replace them if they check out of spec. You should not need a schematic unless one or more of the resistors has discolored.

My tube tester, for what it is worth (it is an emissions tester), now tests tubes that seem to work fairly well as weak or good, depending on the condition of the tube. My #2 setting was particularily at fault. Tubes always tested at weak or replace, so I strongly suspected that its resistors might be drifted. Now it's as good as the other settings (of course you must use the proper setting for the tube in question).

The resistors in my tester are gold band resistors. It isn't like my tester is supposed to be accurate (again, it's an emissions tester), but it is probably a good idea to replace with gold band resistors.

Thomas

Also, you may need to clean the switch contacts.

:Also, you may need to clean the switch contacts.

Carl, thank you, I'll a;so try that

:Well, here's my answer (again, from a 27 year old, so be prepared for disaster). My EICO 625 had your problem when I first got it. All of the resistors had drifted. Since most, if not all, tube testers use a simple network of resistors and such, I suggest that you check the resistors and replace them if they check out of spec. You should not need a schematic unless one or more of the resistors has discolored.
:
:My tube tester, for what it is worth (it is an emissions tester), now tests tubes that seem to work fairly well as weak or good, depending on the condition of the tube. My #2 setting was particularily at fault. Tubes always tested at weak or replace, so I strongly suspected that its resistors might be drifted. Now it's as good as the other settings (of course you must use the proper setting for the tube in question).
:
:The resistors in my tester are gold band resistors. It isn't like my tester is supposed to be accurate (again, it's an emissions tester), but it is probably a good idea to replace with gold band resistors.
:
:Thomas

Tom:

Thanks for the answer, I'll try it and see.

::Well, here's my answer (again, from a 27 year old, so be prepared for disaster). My EICO 625 had your problem when I first got it. All of the resistors had drifted. Since most, if not all, tube testers use a simple network of resistors and such, I suggest that you check the resistors and replace them if they check out of spec. You should not need a schematic unless one or more of the resistors has discolored.
::
::My tube tester, for what it is worth (it is an emissions tester), now tests tubes that seem to work fairly well as weak or good, depending on the condition of the tube. My #2 setting was particularily at fault. Tubes always tested at weak or replace, so I strongly suspected that its resistors might be drifted. Now it's as good as the other settings (of course you must use the proper setting for the tube in question).
::
::The resistors in my tester are gold band resistors. It isn't like my tester is supposed to be accurate (again, it's an emissions tester), but it is probably a good idea to replace with gold band resistors.
::
::Thomas
:
:
:Tom:
:
:Thanks for the answer, I'll try it and see.

:Well, here's my answer (again, from a 27 year old, so be prepared for disaster). My EICO 625 had your problem when I first got it. All of the resistors had drifted. Since most, if not all, tube testers use a simple network of resistors and such, I suggest that you check the resistors and replace them if they check out of spec. You should not need a schematic unless one or more of the resistors has discolored.
:
:My tube tester, for what it is worth (it is an emissions tester), now tests tubes that seem to work fairly well as weak or good, depending on the condition of the tube. My #2 setting was particularily at fault. Tubes always tested at weak or replace, so I strongly suspected that its resistors might be drifted. Now it's as good as the other settings (of course you must use the proper setting for the tube in question).
:
:The resistors in my tester are gold band resistors. It isn't like my tester is supposed to be accurate (again, it's an emissions tester), but it is probably a good idea to replace with gold band resistors.
:
:Thomas