Catalogue
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Mullard Television Valve Type PL504 With Carton, by Mullard, Britain, 20th Century
Inventory Number: 40357
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 PL504 was a purpose designed television pentode line output valve. It was introduced as a replacement for the PL500. The peak anode voltage was quoted as 7,000 Volts and showed why the line output stage of a television receiver was the last consumer electronics product to remain a valve, with the exception of the CRT. TV line output valves found their way into amateur radio transmitters for service at HF (up to 30 MHz) because of their peak voltage characteristics and relatively high current capability.
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