Catalogue
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Mazda Radio Valve Type PY33 With Carton, by Mazda, England, 1960s
Inventory Number: 26731
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:
The PY33 operated directly from the mains input. With series resistance of 25 Ohms, it fed a reservoir capacitor of 200 µF. The 300 mA heater was the standard for TV receivers from the 1960s.
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