Is it necessary to readjust the bias on a jolida 502P tube amp after changing from 8 ohm speakers to 4 ohm speakers? The 8 ohm speakers were connected to the 8 ohm taps and I connected the 4 ohm speakers to the 4 ohm taps.
That is a good question. I own the Jolida 502P amp as well but have always had about 6 ohm nominal speakers so I've always used the 4 ohm taps to be safe. I think the one time I had 8 ohm speakers I just switched taps and then turned on the 502P. I had no issues at all. The only time biased jumped was when I switched out power tubes. I had NOS 6550 tubes and dialed down the bias and put in Tung Sol KT120s. I checked the bias and it was 700 millivolts.
Well I hope the A'gon vets can advise on this. Have you also tried calling Jolida? Maybe they can help after the holiday.
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