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Brimar Radio Valve Type 50CD6G With Carton, by Brimar, England, Mid 20th Century
Inventory Number: 34364
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 is 300mA heater version of 6CD6 beam tetrode. Parameters given are for single-ended audio use with an anode load of 1,500 Ohms. Valve is also specified for push pull service, where it will 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 can be 700 Volts, with positive surge of up to 6,000 Volts. Anode dissipation is 15 Watts and screen dissipation 3.0 Watts. Anode current can be 170 mA. Other parameters would be screen voltage of 170 Volts and negative grid surge of -150 Volts.
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