[David Dunlop]

As well as its more formal name, this component is also known as the Audio Output Transformer, with a Circuit Reference Number “T1A”.

It is mounted to the side of the chassis, in the lower, front right corner (upper left section of the 1st Photo in Post #620), held in place by four slotted, countersunk machine screws, with external tooth lock washers and hex nuts.

Interestingly, the two rear sets of hardware had thick, spacer/washers between the transformer case and the lock washers. They were serving no useful purpose there, but were the same thickness as the chassis metal. The transformer sat firm and flush to the front chassis, but perhaps at one point in early production, where was not enough clearance for the transformer to fit flush, so spacers were used to give it clearance on the chassis. The spacing issue was resolved but the spacers were never dropped from the production process.

The stamped part number on the transformer case faces out, to the right side of the chassis when installed, with Terminals 3. 4 and 5 on the transformer panel facing the front of the chassis. The transformer appears to be of Canadian Marconi design and manufacture, based on the Part Number Stamp on the side of the case.

The side of the transformer case facing to the rear of the receiver chassis has a pink stamp on it stating, “O.K. TO FILL”.

On the top terminal board of the transformer, the CMC Part Number is repeated, directly above the one stamped on the side of the case. Roughly dead centre is stamped the Circuit Reference Number “T1A’. Stamped in the large space above ‘Terminal 1’ is another large, pink square stamp stating, “TESTED O.K.”, with a round, black CMC Inspection Stamp over top of it.

David