Hammond makes these as a drop-in replacement. However the transformer may cost as much as the amplifier is worth. YAESU FL-2100B POWER XFMR P/N 21002, T1, FOR PAIR OF 572B'S CORE) EI-175 X 3" 29GAM6X STYLE #) 06 E-I LAMINATED CORE PR) 0-100-110-117 & 0-100-110-117 VAC 60 HZ S1) 0-425-620-850 VAC @ 1A ICAS S2) 6.5 VCT @ 8A CCS S3) 13 VAC @ 1A CCS DM) HT = 4.250 WT = 5.250 DT = 4.375 MD = 3.500 MW = 4.375 PRICE) $350.00 Plus S&H FOB Buffalo, NY WEIGHT) 19 LBS