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RE: MQ OPTs for Tubelab SE 300b

The RH-60 is a series feed transformer. The same coil is available for parafeed, where it handles zero direct current but has more inductance for deeper bass - assuming the parafeed choke has more inductance than the airgapped RH-60.

For parafeed, no changes to the circuit board are needed; you just have two pieces of iron and a parafeed capacitor that are mounted off the board. (A 3.3uF/630v capacitor would be a good choice.)

Power is about 8 watts - see the chart at the link.


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