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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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28th Apr 2013, 2:10 pm
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#1 |
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Pentode
Join Date: Dec 2011
Location: Daventry, Northamptonshire, UK.
Posts: 163
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1920's Colvern tuning coil assembly
Hi All
Can anybody supply me with any info. on a tuning coil assembly,made by a company called Colvern ltd.in Romford Essex around about 1927. It was made presumably for the home build market and consisted of 3 coils,LW,SW,(what we would now call MW)and a reaction coil. There are 2 coils on the outside former,a large one and a small one at the bottom,and one coil down the centre of the former with a label marked "new Mullard master three". The coil base has 6 connections marked 1 to 6 with a sliding wavechange switch built into it. On the underside,numerous pins are hardwired together. I think connections 1 and 2 are for the tuning condensor,but other than that I am just guessing. There is a similar item,RM3S, on the 'Radio Museum' website but it is a later version,about 1935. Many Thanks Alan |
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28th Apr 2013, 7:35 pm
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#2 |
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Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,194
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Re: 1920's Colvern tuning coil assembly
Hi Alan, Colvern and Telsen both made a similar range of baseboard mounting coils. PM me you e-mail and I'll send you a scan or one of their leaflets showing connections and typical circuit.
Ed |
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