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:I have read that the 148 did have different cabinet styles. I own the cathedral version. It uses a type 42 tube in the output. The power transformer has a high voltage winding, a 5.0 volt winding, and a 7.0 volt winding. The 42 is lit from the 7.0 volt winding directly. The 2.5 volt tubes are strung in series, and are fed from the 7.0 volt winding. The pilot lamp, a 2.5 volt bulb, is in parallel with one of the tubes (which causes it to run slightly dimmer, and over-powers the others slightly). I assume that if your set has a 2A5, all of the tubes are in parallel, and are wired to a 2.5 volt winding. I don't see why they didn't use a 6-8 volt bulb for my set.
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