Wade Bequest collection of valves: R4 triode radio valve
- PART OF:
- Wade Bequest collection of valves
- Made:
- 1917 in Portsmouth
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Wade Bequest collection of valves: R4 triode radio valve. Marked 'Wireless Receiving Valve R.4. Pattern No 4411 serial A5774' on bulb. STS bulb with two flying leads. Paper label: 1917. Paper Label: W28.
