Neutralising the Radiola 20
(To the Editor.) A CORRESPONDENT, R.D. (Kaitangata), writes with regard to our answer to a query concerning the use of other American valves in the Radiola 20. Our answer favoured the 199,120. He states that we are not correct in this statement, and 'that he has been using A409 as r.f., detector A415, first audio A409, power B403. They have been in use for three years, and have given excellent service. His log to date is 74 stations. Regarding neutralisation, he says it certainly takes time and patience to re-neutralise the set, but he considers it worth while. We pass this information on, but we might add that our remarks concerning the use of the 199 and 120 type valves were based not solely. upon our own experience, nor those of one: listener, but upon the average. However, when the set is neutralised for other valves, it will give good service.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310814.2.22.7
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Radio Record, Volume V, Issue 5, 14 August 1931, Page 7
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155Neutralising the Radiola 20 Radio Record, Volume V, Issue 5, 14 August 1931, Page 7
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