Admiralty Type 619 Receiver Outfit CAT #5279, 1954


This is a Rees Marine "Receiver Outfit CAT" which is part of the Admiralty Type 619 transmitter / receiver system as fitted to smaller Royal Navy vessels in the fifties and early sixties. It's an extremely general coverage receiver, 60 kHz to 30 MHz.

From the Preliminary Technical Information Type 619 consists of an MF transmitter, an HF transmitter, the CAT receiver and a Power Supply Unit. The transmitters are AM only (or CW of course), and the receiver is fitted with a BFO for CW / SSB reception.

The unit was manufactured by Rees Mace Marine which later became PYE Marine. Keith has one bearing the PYE label while mine is Rees Mace Marine.

Production life: 1953 - 1965
Standard frequency range: MF TX 330-550 KHz, HF TX 1.5-16 MHz, RX 60kHz-30 MHz
Transmitter RF output: MF TX 15 Watts AM, HF TX 40 Watts AM

These sets are pretty badly documented on the web. Here's a video and here's the entry at

IMO These sets are very well built. Wires are neatly laced, and there seems to be a very strict colour coding system for all the wiring.

Replacement power connector Keith mentions that the power / speaker connector is hard to find, seems that the previous owner of my one realised this and fitted a replacement connector...
Incomplete wiring to power connector ... or at least half-fitted. The wiring is a mess. But I enjoy reverse-engineering.

Output transformer part of schematic PLN is the missing connector. It carries 100 ohm and 600 ohm speaker output, a muting relay input, the 245V HT supply and the 6.3V AC heater supply. The DPO removed the filter FL5 along with it.

Tracing the wiring: The shielded cable from the headphone connector on the left-hand side of the front panel goes to the output transformer, connected to the same terminals are two blue wires. Blue = 100 ohm. Check. Next to this on the output transformer is a pair of green wires. Green = 600 ohm. Check.

terminal strip on right-hand side

Other terminals on the output transformer are two pink and one red. Seems a good idea to assume that the red is HT, tracing it a bit more shows that it goes to some 2.2k resistors, that checks out against the schematic.

Heater wiring

That leaves a brown wire and examination shows that every tube socket has a brown wire. Brown = heater, check. (That's V11 the voltage regulator, V10, V9 from left to right. You can't really see it in this reduced-size picture, but it checks out, one side of the heater to chassis and the other side to brown).

TODO: buzz out red and brown to make doubly sure before applying power. I might be reckless but I'm not stupid.

The two white wires are most likely the relay mute input, the relay has three white wires connected to it so that seems a safe assumption for now.

The Type 619 receiver covers 60kHz to 31 MHz in eight ranges.
Range 160 - 125kHzSingle conversion, IF at 460kHz
Range 2100 - 255kHzSingle conversion, IF at 460kHz
Range 3255 - 675kHzDouble conversion, IFs at 1.4MHz and 460kHz
Range 4675 - 1500kHzSingle conversion, IF at 460kHz
Range 51.5 - 3.4MHzSingle conversion, IF at 460kHz
Range 63.4 - 7.2MHzDouble conversion, IFs at 1.4MHz and 460kHz
Range 77 - 15MHzDouble conversion, IFs at 1.4MHz and 460kHz
Range 815 - 31MHzDouble conversion, IFs at 1.4MHz and 460kHz

The higher ranges are double conversion (for selectivity) but of course Range 3 also has to convert up and then down to not step on its own dick. Selectivity is specified at 6kHz (wide), 4kHz (intermediate), 950kHz (narrow) and 700kHz (very narrow). It looks as if only the two wider settings are available when in double conversion?

Receiver Block Diagram

V1RF AmplifierCV454Variable μ screened pentodeCV4009 6BA6 EF93
V21st Mixer / Xtal osc.CV2128Triode / Heptode frequency changer6AJ8 ECH81
V31st Local osc.CV133Triode amplifier / RF power valveCV4058 6C4 EC90
V42nd Mixer / 2nd Local osc.CV2128Triode / Heptode frequency changer6AJ8 ECH81
V5IF ampCV131 or CV4015General purpose amplifying pentodeEF92
V6IF ampCV131 or CV4015General purpose amplifying pentodeEF92
V7AGC diode / Det. diodeCV140Double signal diodeCV4025 6AL5 EB91
V8Noise limiterCV140Double signal diodeCV4025 6AL5 EB91
V9AF ampCV131 or CV4015General purpose amplifying pentodeEF92
V10AF outputCV2127Video output pentodeCV4055 6CH6 EL821
V11Stab. HT supplyCV395150V voltage stabiliser, 5-45 mA
V12BFOCV131 or CV4015General purpose amplifying pentodeEF92

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