11-22-2014, 10:56 AM
Okay!
Since I last posted in this thread, I recapped my 53-960 - you can read about that here.
I have sent the 42-720's dial back plate off to Greg (NostalgiaRadioTime) to let him work his magic on it.
And now I have a new Hammond 270EX transformer.
It is longer than the original, plus it has wires protruding from both bells. The original had all of the wires coming from just one bell. So...that meant drilling and enlarging a second hole for some of the transformer leads.
Here's how it looks:
[Image: http://www.philcoradio.com/images/phorum...e00030.jpg]
[Image: http://www.philcoradio.com/images/phorum...e00031.jpg]
[Image: http://www.philcoradio.com/images/phorum...e00032.jpg]
I'm using only three screws to hold it onto the chassis; the fourth screw hole would be right above where the audio output transformer is mounted, so it could not be used.
I probably should have purchased the 270DX instead; that would have allowed me to reuse the original transformer bells. But this one has plenty of reserve current capacity and should never run hot. With all of that iron, it looks like a 25 cycle transformer (even though it isn't)!
This transformer has a 5 volt winding as well as a 6.3 volt winding, so I rewired the 6X5 tube socket to accept a 5Y3GT instead. The 5Y3GT is a more robust rectifier, and this mod should eliminate the possibility of a shorted rectifier tube.
Since I last posted in this thread, I recapped my 53-960 - you can read about that here.
I have sent the 42-720's dial back plate off to Greg (NostalgiaRadioTime) to let him work his magic on it.
And now I have a new Hammond 270EX transformer.
It is longer than the original, plus it has wires protruding from both bells. The original had all of the wires coming from just one bell. So...that meant drilling and enlarging a second hole for some of the transformer leads.
Here's how it looks:
[Image: http://www.philcoradio.com/images/phorum...e00030.jpg]
[Image: http://www.philcoradio.com/images/phorum...e00031.jpg]
[Image: http://www.philcoradio.com/images/phorum...e00032.jpg]
I'm using only three screws to hold it onto the chassis; the fourth screw hole would be right above where the audio output transformer is mounted, so it could not be used.
I probably should have purchased the 270DX instead; that would have allowed me to reuse the original transformer bells. But this one has plenty of reserve current capacity and should never run hot. With all of that iron, it looks like a 25 cycle transformer (even though it isn't)!
This transformer has a 5 volt winding as well as a 6.3 volt winding, so I rewired the 6X5 tube socket to accept a 5Y3GT instead. The 5Y3GT is a more robust rectifier, and this mod should eliminate the possibility of a shorted rectifier tube.
--
Ron Ramirez
Ferdinand IN
