The Pacemaker model 5155 was manufactured for H. W. Clarke Ltd by Collier & Beale Ltd in 1955.

The Pacemaker Petite is a 5-valve broadcast-band mantle receiver using unusual 'new' construction techniques including a bakelite 'chassis' that was wired in one run using tinned copper wire, with the unwanted sections snipped out once done, and half-wave rectified mains supplying the HT and a small mains transformer providing the 6.3V filament voltage.  The chassis also has posts and bridges moulded in to aid in the routing of wires in such a way that they don't short.

Repair videos:


The red model above is a Motorola from the US of A - virtually the same cabinet, although very different design.

Pacemaker 5155 Petite

Originally coloured plastic cabinets were produced (Ivory, Walnut, Maroon, Pastel Green, Pastel Blue, Red), although these cracked with heat and so later versions used painted black or brown bakelite with heat shields inside the top of the cabinet.

The set had a cardboard back containing all the local radio stations and their frequencies - this was apparently because consumers were upset about a dial which did not have their favourite radio station call sign on it.

A run of 5000 sets was produced to reduce costs - especially the tooling cost of the cabinet (1000 - 2000 was typical at the time, so this was huge for our small market).

The cabinet was also used by Motorola in the USA for one of their models.

Much of this information comes from articles in NZVRS bulletins by Ian Sangster and Bob Blythe (one of the originators of the set at Collier & Beale).


Technical Information

Valves (5): 6BE6, 6BA6, 6AV6, 6AQ5, 6X4

Intermediate Frequency: 455kc/s

Frequency Bands: 1

Chassis Notes(most schematics can be clicked to download a full size version)

Bakelite chassis, early NZ attempt at production streamlining.

1955 Pacemaker model 5155 Schematic

1955 Pacemaker model 5155 Chassis

General Construction Notes for Collier & Beale Ltd:

Model numbering followed no real sensible scheme until around 1940 - and prior to 1934 apparently no model numbers were assigned at all.

From 1940 a 3- or 4-digit system was employed where the first digit indicates the number of valves, the second digit is the number of bands and the third is the year of manufacture.  From 1950 the last digit became two digits, eg: 5151 is a 5-valve broadcast-band only from 1951.

From 1957 model numbers were replaced with model names, ie the Pacemaker Buffalo - which makes the year of manufacture hard to determine unless service info is consulted (although C&B often released service info after the radio, and the date on the service info was for its release, not that of the model.