Because I wasn't quite sure of the capacitance (sometimes it changed in successive readings), I opted to up the value, when in doubt. 0.6 MFD sometime read 0.75 MFD, so I upped the value to 1 MFD. Similarly, one of the 1 MFD capacitors read 1.5 MFD at one point, so I opted to go with 1.5 MFD. None of these were actually labeled, nor did the schematic match what was actually found.
The Rogers 120 had several old paper capacitors in it. Most appeared to be working, but since these were nearly a 100 years old, I decided to replace the internals with modern equivalents. As you can see from the photos below, the new components can be easily hidden inside the original cases, giving the appearance that they were unchanged. Because I wasn't quite sure of the capacitance (sometimes it changed in successive readings), I opted to up the value, when in doubt. 0.6 MFD sometime read 0.75 MFD, so I upped the value to 1 MFD. Similarly, one of the 1 MFD capacitors read 1.5 MFD at one point, so I opted to go with 1.5 MFD. None of these were actually labeled, nor did the schematic match what was actually found.
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Today I picked up an early Model 120 Rogers Batteryless Radio from a person in London, Ontario. A Type 120, which is one of the first series of AC operated radios produced in Canada (if not the world). It was first demonstrated in August 1925 at the Canadian National Exhibition (CNE) in Toronto.
The unit was in exceptional condition. Whoever owned it over the years kept must have kept it as a display piece at least as there was no moisture damage or rust to speak of. The cloth covered wire looks like it was made yesterday. There is no mold or fading of the colours. The set even came with the instruction card still attached to the inside cover. The only issues I could see was a disconnected wire (to the speaker jack) and a frayed power cable (as is normal for such old equipment). All tubes were present (Rogers #32). In the power supply one of the two Rogers RX-100 tubes (half wave rectifiers) was missing. |
AuthorCharles Baetsen holds a Bachelor and a Master's degree in Engineering Physics from McMaster University in Hamilton, Canada. Archives
February 2024
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