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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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22nd Oct 2017, 10:30 am | #21 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: What type of capacitor for R.F. decoupling ?
Older silver-mica capacitors certainly were axial leaded, and I've got a lot of them as NOS. Rather fragile mechanically, and wax-covered. There were also some military types covered with moulded plastic or even ceramic, probably the best style in my opnion.
Later, the standard type was covered in a hard red layer, but typically with the two legs from one side, ie radial, for PCB mounting. I was wondering whether anybody made axial types with the hard epoxy covering, akin to those linked to above, but with a lead out of each side. Andy |
22nd Oct 2017, 10:50 am | #22 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: What type of capacitor for R.F. decoupling ?
I have vague memories of using hard cased axial SM's, brownish colour.
The most common type of axial SM that I came across were waxed covered, there were some that had no covering except some kind of paint, yellow, orange and sometimes white. Lawrence. |
22nd Oct 2017, 11:42 am | #23 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
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Re: What type of capacitor for R.F. decoupling ?
I have also, in the past, used the hard cased brownish SM Caps, and those I still have are that type. Many years ago I used SM caps of that type, in different values, wired to appropriate pins of a B9A valveholde, into which Denco Coils of different ranges could be plugged, automatically connecting to a padder cap. of the correct value when the coil was changed.
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22nd Oct 2017, 7:39 pm | #24 |
Heptode
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 762
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Re: What type of capacitor for R.F. decoupling ?
I have looked without success recently. I had to replace 3 510pF moulded micas and a 100pF in an audio amp (100pFCAP pic attached). I had a few RadioSpares 500pF red which had the horrible metal tape legs. They had been salvaged from some early digital pcbs and had leads only a couple of mm long. I soldered a couple of BTCu wires and araldited along the bottom. Touched up with some Humbrol enamel. I could have extended the wires round the corner and made them fully axial I suppose.
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George |