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WTB: B&W 51SB-B Audio Transformer
Primary 20,000 ohms single plate 10MA DC
Secondary 500 ohms Ahh, wait, you DID give impedances! What you want is a 20K to 600 ohm line output transformer. I bet a nickel Hammond makes one. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#2
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WTB: B&W 51SB-B Audio Transformer
Scott Dorsey ) writes:
Primary 20,000 ohms single plate 10MA DC Secondary 500 ohms Ahh, wait, you DID give impedances! What you want is a 20K to 600 ohm line output transformer. I bet a nickel Hammond makes one. There was a time when everyone made them. If you were making a phasing rig, you'd need those to interface with the B&W phasing network (the ones that came in a package like a metal tube). The B&W seemed to be the most common, but I think the other similar networks (Central Electronics was another manufacturer) used the same sorts of transformers. So look for a phasing rig, and the transformers will follow. Michael VE2BVW |
#3
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WTB: B&W 51SB-B Audio Transformer
Michael Black wrote:
Scott Dorsey ) writes: Primary 20,000 ohms single plate 10MA DC Secondary 500 ohms Ahh, wait, you DID give impedances! What you want is a 20K to 600 ohm line output transformer. I bet a nickel Hammond makes one. There was a time when everyone made them. If you were making a phasing rig, you'd need those to interface with the B&W phasing network (the ones that came in a package like a metal tube). The B&W seemed to be the most common, but I think the other similar networks (Central Electronics was another manufacturer) used the same sorts of transformers. So look for a phasing rig, and the transformers will follow. Michael VE2BVW Michael and Scott, Thanks for the tips. I did check Hammond and did not find anything suitable. The 51SB-B does use the B&W Model 350 (2Q4) audio phase shift network. I suppose my best bet will be to look for a junk phasing rig at a hamfest. Gene W3PM |
#4
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WTB: B&W 51SB-B Audio Transformer
Michael Black wrote:
Scott Dorsey ) writes: Primary 20,000 ohms single plate 10MA DC Secondary 500 ohms Ahh, wait, you DID give impedances! What you want is a 20K to 600 ohm line output transformer. I bet a nickel Hammond makes one. There was a time when everyone made them. If you were making a phasing rig, you'd need those to interface with the B&W phasing network (the ones that came in a package like a metal tube). The B&W seemed to be the most common, but I think the other similar networks (Central Electronics was another manufacturer) used the same sorts of transformers. You saw transformers like this in most audio equipment... you'd see a single-ended output stage, often a 6AQ5 or even a 6V6, driving an output transformer for a 600 ohm output. This was one of the most common transformer types around because everyone used them for their output stages. But you're right... Hammond doesn't have anything in the catalogue, although they do have a 20k to 32ohm output transformer. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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