11-14-2021, 08:51 AM
Hi All
My first attempt at radio restoration, just opened up the chassis and already in trouble.
http://philcoradio.com/library/download/...l.%202.pdf
A brief background, I always enjoyed refinishing furniture, loved the look of old radios and when I saw this radio for sale I phoned the owner. An older lady who was selling it indicated that her family had owned it from purchase, it had never been worked on or repaired so I thought, perfect for a beginner. I have been reading on what to do and what not to do so I figured this radio would be ideal for a “recap”
I have trouble at this time understanding schematics I thought I would replace all the caps, check the resistors and it would be a learning experience that I could use to help me with how to follow a schematic.
Wrong! Nice lady but as the photos show this radio has had repairs and from what I know which isn’t much, they weren’t done very well.
My initial concern was to replace the two electrolytics p/n 66 and p/n 64. As the photo shows they’ve been moved. The existing 22 mfd cap I assume is for the original 18 mfd p/n 66. It is attached to the bias resistor strip and the condenser block circled in yellow. The other 8 mfd cap attached to the same bias strip as the 22 and the other end to condenser block 52. I assume this cap is part of what is supposed to be p/n, a duo 8/10 mfd cap. There is no 10 mfd cap anywhere.
I plan on replacing block 69 with safety caps, change all other caps, check resistors and replace the power cord but as I mentioned earlier, my ability to read schematics at this time is limited so I am appealing for help from members of this forum to walk me thru how and where to connect the replacement caps for these two electrolytic caps. Are the connection points for the existing two caps correct and can I just replace them with new caps? If not, where are the correct connection points and where do I connect the 10 mfd cap that is missing. I know that correct polarity is essential with electrolytic caps so I don’t want to do this wrong and ruin other parts of the radio.
I realize that this is a long post and basic for all of you, but with no electrical background I really need some assistance from knowledgeable members like yourselves that I can gain experience from.
I will appreciate all and any help.
My first attempt at radio restoration, just opened up the chassis and already in trouble.
http://philcoradio.com/library/download/...l.%202.pdf
A brief background, I always enjoyed refinishing furniture, loved the look of old radios and when I saw this radio for sale I phoned the owner. An older lady who was selling it indicated that her family had owned it from purchase, it had never been worked on or repaired so I thought, perfect for a beginner. I have been reading on what to do and what not to do so I figured this radio would be ideal for a “recap”
I have trouble at this time understanding schematics I thought I would replace all the caps, check the resistors and it would be a learning experience that I could use to help me with how to follow a schematic.
Wrong! Nice lady but as the photos show this radio has had repairs and from what I know which isn’t much, they weren’t done very well.
My initial concern was to replace the two electrolytics p/n 66 and p/n 64. As the photo shows they’ve been moved. The existing 22 mfd cap I assume is for the original 18 mfd p/n 66. It is attached to the bias resistor strip and the condenser block circled in yellow. The other 8 mfd cap attached to the same bias strip as the 22 and the other end to condenser block 52. I assume this cap is part of what is supposed to be p/n, a duo 8/10 mfd cap. There is no 10 mfd cap anywhere.
I plan on replacing block 69 with safety caps, change all other caps, check resistors and replace the power cord but as I mentioned earlier, my ability to read schematics at this time is limited so I am appealing for help from members of this forum to walk me thru how and where to connect the replacement caps for these two electrolytic caps. Are the connection points for the existing two caps correct and can I just replace them with new caps? If not, where are the correct connection points and where do I connect the 10 mfd cap that is missing. I know that correct polarity is essential with electrolytic caps so I don’t want to do this wrong and ruin other parts of the radio.
I realize that this is a long post and basic for all of you, but with no electrical background I really need some assistance from knowledgeable members like yourselves that I can gain experience from.
I will appreciate all and any help.
