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Brimar Radio Valve Type 50CD6G, by Brimar, England, Mid 20th Century
Inventory Number: 41092
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Historical Background - British Radio Valve Manufacturers' Association (BVA)
Text:
The British Radio Valve Manufacturers' Association (BVA) was established in July 1926 and was a registered trade union. It had been preceded by the Valve Manufacturers' Association, which had established a 'Memorandum of Sales Plan'. This agreement, which was signed by the seven major British valve manufacturers, secured a uniform practice in the sale of radio valves for broadcasting purposes in the UK. Practical examples included similar discounts and sales conditions, and were considered a form of restrictive practice. This association continued into the 1950s.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
50CD6 was 300mA heater version of 6CD6 beam tetrode. Parameters given were for single-ended audio use with an anode load of 1,500 Ohms. Valve was also specified for push pull service, where it could deliver 13.5 Watts at 1.7% distortion in class A. Unusually the valve was primarily designed for use as a line output stage in television receivers. Anode supply could be 700 Volts, with positive surge of up to 6,000 Volts. Anode dissipation was 15 Watts and screen dissipation 3.0 Watts. Anode current could be 170 mA. Other parameters were a screen voltage of 170 Volts and negative grid surge of -150 Volts.
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