50s Early TAMURA (A-4714) SE OPT for 45, 46, 71A special order from NHK

Description

Here are a Extremely RARE pair of Tamura OPT transformer, using for single end tube amplifier, early version of A-4714, special order made from NHK.
Primary : 5Kohm, secondary 600ohm, 150ohm, 6ohm, 1.5ohm, NFB : 250 ohm  Perfect matching for 101D, 71A, 45, 46,47 tube as well as many other legend tubes.
Can be used for preamp as well as power amp.
Coil continuos was checked and both transformers are working condition.
DCR for transformer 1
1-2: 535 ohm
3-4 : 94ohm (NFB)
5-7 (8-10): 36.2 ohm
6-7: (8-9) 0.8ohm
DCR for transformer 2
1-2: 526 ohm
3-4 : 91ohm (NFB)
5-7 (8-10): 36.2 ohm
6-7 (8-9): 0.8ohm
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