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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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Old 28th Apr 2013, 1:10 pm   #1
Daventry 5XX
Join Date: Dec 2011
Location: Daventry, Northamptonshire, UK.
Posts: 163
Default 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 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

Daventry 5XX is offline  
Old 28th Apr 2013, 6:35 pm   #2
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 6,825
Default 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_Dinning is online now  
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