say I was at work and used the sencore tester like yours to test some GEC kt88s and one was acting funny on grid leak test if I took out the tube and did a repeat it tested good and when I moved rocked pins a little the needle shot up to bad don't know if the socket is bad but heck the tubes look good. mark
@Hemingray it just uses a 12AU7A as a rectifier to make wall outlet 110-120 volts AC into DC. Just replace it with a JAN NOS 12AU7A if the original gets funny. They make some really durable new production ones too like JJ and Tung-Sol also.
not sure, Ill look into it
guitarthroat 1 month ago
say I was at work and used the sencore tester like yours to test some GEC kt88s and one was acting funny on grid leak test if I took out the tube and did a repeat it tested good and when I moved rocked pins a little the needle shot up to bad don't know if the socket is bad but heck the tubes look good. mark
TheWarped45 1 year ago
@TheWarped45 Ya I found you need to test it for a few minutes.
Some tubes were good then slowly rise up to bad as minutes pass.
1112223333111 1 year ago
I have that same tester. Odd thing, it uses a tube itself (12AU7A), One heck of a nice tester for many things however.
Hemingray 2 years ago
@Hemingray it just uses a 12AU7A as a rectifier to make wall outlet 110-120 volts AC into DC. Just replace it with a JAN NOS 12AU7A if the original gets funny. They make some really durable new production ones too like JJ and Tung-Sol also.
guitarthroat 1 month ago
@guitarthroat Never thought it to use it for a rectifier, It uses both triodes in diode mode as a full wave?
Hemingray 1 month ago