04-17-2018, 02:51 PM
Hi Arran,
The IF transformer thing is a mystery. My chassis has the smaller cans, around 1" square footprint, and rather tall. There must have been a lot of "grunt work" in designing these chassis, and the various odds and sods of metal pressings and widgets that make them fit together.
On this set, there are two pairs of connections for the loop antenna. One which comes through a slit in the chassis side (as I described before), and another which is soldered to the rear of the terminals for an external antenna. A shorting bar is provided, to be used depending on internal or external antenna choice.
The mixture of cloth and rubber wire is also intriguing. Any wires leaving the chassis are cloth, stranded type. This makes sense as they could be subject to more movement, and need better protection. Solid core wires for under chassis are rubber covered 20 awg. But there is also some under chassis wiring that is cloth covered, and some short bare wire connections. There doesn't seem to be a particular pattern for this, although the higher voltage connections are made with cloth covered wire.
P.S. I thought the wire I used to replace the rubber stuff was a bit skinny, and now realise it was 300 V insulation - "Who looks under a chassis?" - Me! So for better safety margin and closer appearence, I bought some 600 V rated stuff, and will replace my work. Shouldn't be too bad now I know where things go, and I'll feel much happier with it this way
Cheers
Ed
The IF transformer thing is a mystery. My chassis has the smaller cans, around 1" square footprint, and rather tall. There must have been a lot of "grunt work" in designing these chassis, and the various odds and sods of metal pressings and widgets that make them fit together.
On this set, there are two pairs of connections for the loop antenna. One which comes through a slit in the chassis side (as I described before), and another which is soldered to the rear of the terminals for an external antenna. A shorting bar is provided, to be used depending on internal or external antenna choice.
The mixture of cloth and rubber wire is also intriguing. Any wires leaving the chassis are cloth, stranded type. This makes sense as they could be subject to more movement, and need better protection. Solid core wires for under chassis are rubber covered 20 awg. But there is also some under chassis wiring that is cloth covered, and some short bare wire connections. There doesn't seem to be a particular pattern for this, although the higher voltage connections are made with cloth covered wire.
P.S. I thought the wire I used to replace the rubber stuff was a bit skinny, and now realise it was 300 V insulation - "Who looks under a chassis?" - Me! So for better safety margin and closer appearence, I bought some 600 V rated stuff, and will replace my work. Shouldn't be too bad now I know where things go, and I'll feel much happier with it this way
Cheers
Ed
I don't hold with furniture that talks.
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