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Post by frankb on Oct 3, 2022 0:32:02 GMT
I'm working on an SHFA5 amp this time. I always wondered why Seeburg mounted some of the multisection cans on a fiber insulator with separate grounding wire going from one of the can "twist lugs" to a chassis grounding lug. ....BTW - I gave up on that SHFA2 with the power transformer replaced. I found another complete SHFA3 to use instead. Thanks for any response.
FrankB
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Post by jukenorman on Oct 3, 2022 14:05:45 GMT
Hi Frank,
I doubt that there's any technical reason! Probably just down to cost and/or availabilty?
Norman.
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tonyj
Junior Member
Jukebox Newbie
Posts: 93 
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Post by tonyj on Oct 21, 2022 1:28:29 GMT
I'm working on an SHFA5 amp this time. I always wondered why Seeburg mounted some of the multisection cans on a fiber insulator with separate grounding wire going from one of the can "twist lugs" to a chassis grounding lug. ....BTW - I gave up on that SHFA2 with the power transformer replaced. I found another complete SHFA3 to use instead. Thanks for any response. FrankB Frank - I don't have a schematic for that amp, but most likely it's because the power supply is delivering both a positive and negative DC voltage to the amp. The chassis (or "ground") is probably the reference for both voltage rails and connects to the center tap of the transformer output. The filter capacitor for the negative supply would have a positive lug from the can to ground and the can itself (the capacitor common or negative terminal) would connect to the negative voltage "rail". If you think about it voltage wise, the chassis "ground" is more positive with respect to the negative DC line, so hooking the can to the chassis for that one would be placing the capacitor backwards, causing it to blow. |
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