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power coaxial triode - GI7-BT - (NOS) without heat sink = Gi-70BT
NOS/NIB tubes. Application: continuos wave or pulsed operation with anode modulation, as an oscillator and an amplifier. These tubes were available in two variants, differing in the cooling type. The Gi-7BT was normally with the heat sink for forced air and Gi-70BT without the heat sink for other cooling systems. In this case they have removed the heat sinks from the Gi-7BT tubes and turned it into the Gi-70BT. If you have some spare heat sinks for these tubes, you can use them as normal Gi-7BT. If not, it is usable only as GI-70BT.
(we reserve the right to change the description and specifications without prior notice)