+1 to eric_squires. Bloody hell man!,
Unless your vintage x-covers have electrolytic caps don't f* with them! Just pass enough juice to reform those old Mylars or what have you. Replacement of resistors if they have gone out of spec could clean thing up a bit, but an attempt to re-engineer those x-covers will likely not end well. I've owned RS-1.5 and sadly parted ways, but still have some of my best audio memories those paired with an early ps audio preamp and a highly modified dh-220 built by an EE who worked for the sound lab in Groton CT. .
Unless your vintage x-covers have electrolytic caps don't f* with them! Just pass enough juice to reform those old Mylars or what have you. Replacement of resistors if they have gone out of spec could clean thing up a bit, but an attempt to re-engineer those x-covers will likely not end well. I've owned RS-1.5 and sadly parted ways, but still have some of my best audio memories those paired with an early ps audio preamp and a highly modified dh-220 built by an EE who worked for the sound lab in Groton CT. .