via this auction
"Extremely rare - TWO very similar looking BBC audio frequency generators.
Contain:
Some valves including ECC81's;
Several transformers;
BBC Audio meters;
Huge knobs;
Unit one numbered: TS/10P/510
Unit two numbered: OS3/1/1
1950s or early 1960s manufacture.
One has cover missing."
Pics of the inside below.
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