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FERNSEH · 8th Feb 2018, 10:47 pm

These excellent sets date back to 1972, about the time I opened the shop.
Sold under the Marconiphone Ultra and Ferguson brands the set were sold in large numbers. Back then the first fault I encountered was failure of the 12volt supply rectifier diodes in the power supply, the originals weren't up to the job. Fortunately, just in time the 1N5401 series of 3amp diodes were available and were used as reliable replacements. Also, failure of certain diodes in the line output stage, seem to remember the CRT A1 diode needed replacement in early production models. BY207 was the approved replacement.
Models 4816 and 6816 remained in production until 1977.

DFWB.

8th Feb 2018, 10:47 pm	#5
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Marconi 4816 1590 survivor! These excellent sets date back to 1972, about the time I opened the shop. Sold under the Marconiphone Ultra and Ferguson brands the set were sold in large numbers. Back then the first fault I encountered was failure of the 12volt supply rectifier diodes in the power supply, the originals weren't up to the job. Fortunately, just in time the 1N5401 series of 3amp diodes were available and were used as reliable replacements. Also, failure of certain diodes in the line output stage, seem to remember the CRT A1 diode needed replacement in early production models. BY207 was the approved replacement. Models 4816 and 6816 remained in production until 1977. DFWB.