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Seco tube tester "VT grid circuit tester" any info on it?
Made by Seco manufacturing. Mpls, Minn, model GCT-3
It has a "magic eye" tube for the indicator, and 3 sockets. One socket for twin triodes of the pin pattern 9A (12AX7s and such, another for 6V twin triodes, and a 3rd for pentodes like 6AU6s (7CM and 7BK pinouts). Doesn't seem to work but it's not clear how to operate it. The eye tube does glow green. Anyone familiar with Seco equipment? If not I could trace it out; looks to be a transconductance tester for a limited selection of tubes. |
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