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There is a Tungsol 5U4G on Ebay that has test results of 90 and 75 on a Heath tester with a minimum of 50 being passing. I am wondering what the consequences would be of using such an unbalanced 5U4G rectifier in a tube rectified SET amp. What would this imbalance do electrically and would you expect to hear a sonic difference compared to a well balanced rectifier of the same brand/construction? I have a number of 5URG’s, but they are all pretty closely matched between sections, so I have no experience with this level of imbalance.
Follow Ups:
I sincerely doubt that you'd notice any difference as the whole "balance" issue is more a marketing strategy than a true factor in judging the quality or a tube. But the real issue is more one of what you think is a good value for your money - if you're buying this tube at the corresponding price of a similar weight of platinum then you should demand perfection in every way - but if the price is reasonable then why not buy it.
Rob
Personally I would not use a rectifier that measures like that because I have a choice of purchasing a closer balanced tube. Who knows what the voltage difference would be on each 60Hz side without a scope. A choke would clean likely up most or all of the low frequency ripple.
I alway see some imbalance on my emission tester, but not that much. The result will be a bit of 60 Hz ripple on the supply, since one half is dropping more voltage. Best test is the in-circuit voltage - a weak tube will result in low B+. In a low-current circuit,it might still be fine.
Tom, shouldn't a well-designed filter circuit help to balance out this problem?
thanks
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