The RD4/4 machine is an in-house design from the BBC, the recorder was a BTR-2 before all the mono valve electronics were removed and replaced with transistor electronics and addittional tape tension and reel size selection controls added.
source
EMI RD4/4 reel to reel tape recorder BBC mod from the EMI BTR-2
The RD4/4 machine is an in-house design from the BBC, the recorder was a BTR-2 before all the mono valve electronics were removed and replaced with transistor electronics and addittional tape tension and reel size selection controls added.
source
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