Koyo KR-6TS1

Koyo KR-6TS1 - guts

This unit is not from the earliest production, but still uses early NEC oval transistors:
ST37D - ST28B x 2 - ST301 - ST121 x 2 - [SD46]
For reference, the earliest units use the following
NEC oval transistors:
ST16B - ST16A x 2 - ST3B - ST12 x 2 - [SD34]

Runs on 6V of power from 4 x UM-3 (AA-size) batteries. Note: there's a second transparent blue insert that fits between the two rows of batteries. (The earliest production units have a different battery holder.)

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