12-12-2009, 08:08 AM
Thanks for the welcome and the helpful reply Bill,
took a while to get back to this project after moving my shop
first thing I did was fix the speaker plug - after a study of the circuit I see how all that works
I'm gonna get a rivet gun and snap it back together when I get a chance
so, I replaced as many capacitors as I was able to - the attached pics give an idea:
[Image: http://www.lynx.net/~jc/philco650-before.jpg]
[Image: http://www.lynx.net/~jc/philco650-after.jpg]
I tied three 0.082uF/400v film caps together to replace the 0.25uF cap ... there's a mystery cap in the Lower RHS that I couldn't find in the schematic, what was there was 0.1uF/400v and I replaced with the same ... I stopped at the signal caps around the volume control as they looked ok ... I didn't get to 30 and 32 - how the heck do you change those things ?? I imagine one would have to remove the giant rotary switch ... here, I wanted to disturb as little as possible - so I left those for eventual replacement if need be ... I'm curious if I should try going after them while the chassis is open ??
lucky me, the Radio works again and the intermittent popping is gone ...
and I get fairly loud volume when I stick my arm near the top of the chassis - so yeah, tubes appear strongly emissive !
next questions :
(i) what kind of antenna does this radio need ?
(ii) what's the fine-tuning procedure ?
cheers
HR
took a while to get back to this project after moving my shop
first thing I did was fix the speaker plug - after a study of the circuit I see how all that works
I'm gonna get a rivet gun and snap it back together when I get a chance
so, I replaced as many capacitors as I was able to - the attached pics give an idea:
[Image: http://www.lynx.net/~jc/philco650-before.jpg]
[Image: http://www.lynx.net/~jc/philco650-after.jpg]
I tied three 0.082uF/400v film caps together to replace the 0.25uF cap ... there's a mystery cap in the Lower RHS that I couldn't find in the schematic, what was there was 0.1uF/400v and I replaced with the same ... I stopped at the signal caps around the volume control as they looked ok ... I didn't get to 30 and 32 - how the heck do you change those things ?? I imagine one would have to remove the giant rotary switch ... here, I wanted to disturb as little as possible - so I left those for eventual replacement if need be ... I'm curious if I should try going after them while the chassis is open ??
lucky me, the Radio works again and the intermittent popping is gone ...
and I get fairly loud volume when I stick my arm near the top of the chassis - so yeah, tubes appear strongly emissive !
next questions :
(i) what kind of antenna does this radio need ?
(ii) what's the fine-tuning procedure ?
cheers
HR
