UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Ted Kendall · 24th Jul 2022, 9:10 am

The rule of thumb is that the mass of the transformer core varies in inverse proportion to the supply frequency, all other things being equal. So the optimum mass for a 50Hz transformer is 20% greater than that for an equivalent 60Hz design. In practice, a 60 Hz design is usually satisfactory at 50 Hz unless designed to the bone, but will run hotter and more noisily at the lower frequency.

24th Jul 2022, 9:10 am	#8
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,675	Re: HH Scott LK48 restoration The rule of thumb is that the mass of the transformer core varies in inverse proportion to the supply frequency, all other things being equal. So the optimum mass for a 50Hz transformer is 20% greater than that for an equivalent 60Hz design. In practice, a 60 Hz design is usually satisfactory at 50 Hz unless designed to the bone, but will run hotter and more noisily at the lower frequency.