02-06-2021, 02:35 PM
Hey Rich S - Sorry for the delay in responding. The paper caps should be replaced with film caps...polystyrene, polypropylene, polyester. I've been buying from Just Radios: https://www.justradios.com/cart.html Any of those in the left column of that page. I've also bought from Sal's in the past: http://www.tuberadios.com/capacitors/
Be aware that 630v caps will work for all the paper caps in this radio except C15 (Sams) which is a 1000v cap.
For the electrolytics I used to buy them from Just Radios, but have decided I want to use caps that I am certain are good quality (not saying that those on Just Radios are not good quality...I just want to be sure), so I've been buying mostly Nichicon or Rubycon electrolytics. My favorite source for them (and many other things) is Digi-Key: https://www.digikey.com/
It's my understanding that the power transformer ALWAYS runs hot in this set. Both of mine get quite hot. Initially I installed an 18 ohm 50W chassis mount voltage dropping resistor in the AC line to drop the line voltage to around 113v, but it got so hot that the entire chassis got hot and some of the paper caps started loosing their wax (I restuffed them in one set). So I designed and 3D printed a box to house a bucking transformer and mounted it next to the chassis inside the cabinet. I started discussing it midway through this thread on ARF: https://antiqueradios.com/forums/viewtop...g&start=20 This setup has a switch that allows me to switch from full power (usually around 122v for me), to about 114v, or to about 106v. This does help to cool the transformer some, but it still runs hot.
Good luck!
Rich
Be aware that 630v caps will work for all the paper caps in this radio except C15 (Sams) which is a 1000v cap.
For the electrolytics I used to buy them from Just Radios, but have decided I want to use caps that I am certain are good quality (not saying that those on Just Radios are not good quality...I just want to be sure), so I've been buying mostly Nichicon or Rubycon electrolytics. My favorite source for them (and many other things) is Digi-Key: https://www.digikey.com/
It's my understanding that the power transformer ALWAYS runs hot in this set. Both of mine get quite hot. Initially I installed an 18 ohm 50W chassis mount voltage dropping resistor in the AC line to drop the line voltage to around 113v, but it got so hot that the entire chassis got hot and some of the paper caps started loosing their wax (I restuffed them in one set). So I designed and 3D printed a box to house a bucking transformer and mounted it next to the chassis inside the cabinet. I started discussing it midway through this thread on ARF: https://antiqueradios.com/forums/viewtop...g&start=20 This setup has a switch that allows me to switch from full power (usually around 122v for me), to about 114v, or to about 106v. This does help to cool the transformer some, but it still runs hot.
Good luck!
Rich
