03-02-2021, 12:25 AM
Thank you Dale, Arran & Mike
The only reason I'm not ordering the poly films is that I just placed 2 orders for this radio and the next one from Dave at Just Radios, but of course he has a min order (understandable) and I just don't need anything else to justify another order at the moment. So was hoping what I had would work.
Arran, I would use a ceramic but don't have one. the only ones I have in 100pf are Micas. While I have a basic knowledge of tube circuitry, I'm still learning about which caps work best in the different parts of the circuit. I know from other posts, that the stability of the Micas are best in the RF sections, but wasn't sure if they would be a good fit where these are.
Mike, thanks for the reminder about the voltage, that is one thing I pay attention to. The micas I have are rated at 500v. I've been tempted as you say, to just order a variety of caps in bulk to have on hand, but just haven't pulled the trigger on it. I did just as you suggested, went thru tallied up the caps to be replaced (films, Electrolytics & safetys) and ordered them, but when I was making my list forgot a 0 for these. Wrote them down as .001 instead of .0001. I did order the line to ground safety caps you mention. I do understand the importance of those as well as adding a fuse on the hot side of the ac in, and using a polarized plug. I like the replica acorn style.
Not sure if there is another post where the use of the different capacitors is discussed, but there has to be a reason why they went thru the trouble of making a Bakelite container, putting the caps inside, then filling them with a Plastic/Tar substance versus using a wax/paper cap. This radio also uses a rectangular "metal" container underneath, with caps and the Plastic/Tar stuffing as well. Does the Bakelite verses Metal containers serve different purposes, and is the purpose of the filler stuff to keep moisture out ??
"I love the smell of solder in the morning" well, actually at night.
Bob
The only reason I'm not ordering the poly films is that I just placed 2 orders for this radio and the next one from Dave at Just Radios, but of course he has a min order (understandable) and I just don't need anything else to justify another order at the moment. So was hoping what I had would work.
Arran, I would use a ceramic but don't have one. the only ones I have in 100pf are Micas. While I have a basic knowledge of tube circuitry, I'm still learning about which caps work best in the different parts of the circuit. I know from other posts, that the stability of the Micas are best in the RF sections, but wasn't sure if they would be a good fit where these are.
Mike, thanks for the reminder about the voltage, that is one thing I pay attention to. The micas I have are rated at 500v. I've been tempted as you say, to just order a variety of caps in bulk to have on hand, but just haven't pulled the trigger on it. I did just as you suggested, went thru tallied up the caps to be replaced (films, Electrolytics & safetys) and ordered them, but when I was making my list forgot a 0 for these. Wrote them down as .001 instead of .0001. I did order the line to ground safety caps you mention. I do understand the importance of those as well as adding a fuse on the hot side of the ac in, and using a polarized plug. I like the replica acorn style.
Not sure if there is another post where the use of the different capacitors is discussed, but there has to be a reason why they went thru the trouble of making a Bakelite container, putting the caps inside, then filling them with a Plastic/Tar substance versus using a wax/paper cap. This radio also uses a rectangular "metal" container underneath, with caps and the Plastic/Tar stuffing as well. Does the Bakelite verses Metal containers serve different purposes, and is the purpose of the filler stuff to keep moisture out ??
"I love the smell of solder in the morning" well, actually at night.
Bob
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