08-10-2016, 04:44 PM
(08-10-2016, 10:59 AM)Geordie McBoyne Wrote: The frequency changer consists of a 6L7 hexode and a separate local oscillator using a 6J7 triode pentode connected as a triode.
That's a higher quality method than the Heptode or Octode method that became popular in USA mains sets.
Victor Talking Machine Co. founded HMV.
When HMV became separate and took over UK branch of Colombia (Graphophone, the USA part became CBS eventually), that became EMI and took over Marconi Domestic radios with a licence to use Marconi brand.
Victor also founded Victor Japan, later known as JVC.
Marconi was forced (as a foreigner) to divest RCA which bought Victor.
Hence RCA, EMI (HMV) and JVC had right to the Nipper & Gramophone logo, ironically originally painted with an Edison Phonograph, in different markets.
EMI, Marconi (the Commercial radio company rather than the domestic Brand) and RCA cross licensed and co-operated for many years after ownership was separate, hence the EMI/RCA camera & TV co-operation and Marconi Transmitters.
The 1928 to prewar EMI (HMV/Columbia/Marconi brands with the same chassis) often were high quality. One 1949 model HMV I have had almost usable paper dielectric capacitors, the slatted glass scale copied a 1930s Telefunken, who I believe did take RCA patent licences in the early 1930s?
Sadly RCA ended in 1986.
Lucky you having one of those high quality RCA models!
