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WTB: B&W 51SB-B Audio Transformer
Gene Marcus wrote:
I am repairing my B&W 51SB-B Single Sideband Generator and need the following audio transformer: Primary 20,000 ohms single plate 10MA DC Secondary 500 ohms B&W part # T-826 Hi, Looking at the 51SB schematic, is the T-201 input transformer for the antivox circuit the same as one you need? If so, move that transformer over and use any generic 20,000 Ohm to 600 Ohm transformer for the antivox input. snip Ed Knobloch Gene Marcus wrote: Thanks for the tip Ed, but I have used T-201 to replace T-204 in the past. T-202 is bad. When all is said and done, I will probably have to use the two good original transformers as a matched pair in the output circuit (T-202 and T-203) to maintain balance. I don't know why the audio transformers seem to be the weak link in this rig. The B+ is correct and I'm measuring 4 ma through the high Z winding, well below the rated 10 ma. Hi, Gene, you might consider picking up a Heath SB-10 sideband adapter. It is a near clone of the B&W 51SB, and should provide the transformers that you need inexpensively. 73, Ed Knobloch |
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