National Power Supply Information

National Power Supply Information

Designation	 Year	     Notes

7180		 1927	 Heavy duty "B" eliminator. The first
			   "doghouse"
7180-AB 	 1927	 "B" voltages + 2.5 and 5 volt filament voltages
3580 Velvet B	 1929	 3 adjust + 1 fixed "B". SW-4
SW-5 Power Unit  1930	 Low-hum. SW-5
5880-AB 	 1931	 4-prong socket. Single "B" + 2.5V. ACSW-3
5880-AB-S	 1932	 5-prong socket. Dual "B" + 2.5V. SW-58, ACSW-45
GR-SPU		 1932	 Rack mount. AGS, HRO
GR-DPU		 1932	 Rack mounted, dual supplies. AGS, SW-58C
5887-AB 	 1933	 180VDC "B" + 2.5V. FB-7
5897-AB 	 1933	 240VDC "B" + 2.5V. FB-7, HRO, HRO Jr
5886-AB 	 1933	 180VDC "B" + 6.3V. SRR, 1-10, 1-10A, HRO, SW-3U,
			   HFS
SPC		 1936	 Rack mount, combo speaker, power supply, coil box.
			   HRO
686		 1939	 6 volt vibrator pack. 165VDC "B"
1286		 1939	 12 volt vibrator pack. 165VDC "B"
SPU-686 	 1939	 Rack version of the 686
697		 1939	 240VDC "B" + 6.3V. HRO, HRO-5
SPU-697 	 1939	 Rack mounted. 240VDC "B" + 6.3V. HRO, HRO-5,
			   R-211U
5856		 1939	 200VDC "B" + 6.3VAC. NHU
CNA-20090	 1939	 Rack mounted. 240VDC "B" + 6.3V. RAS
CNA-20089	 1939	 25HZ version of the CNA-20090
5886 Version II  1941	 General utility pack. 240VDC "B" + 6.3V

NATIONAL TYPE 686 TAbLE MODEL POWER UNIT

The National Type 686 Table Model Power Unit operates from a 6 volt DC cupply to provide approximately 165 volts at 45 milliamperes DC. The circuit diagram of this unit is shown in Figure 1. Battery clips are provided for convenient connection to a 6 volt storage battery or similar source of power. Output voltages for both A and B supply are available at a four prong socket for convenient plug and cable connection to associated apparatus.Table I lists typical operating voltages and currents when used with the National Type HRO Radio Receiver. Parts Lists are given in Table III. The Power Unit consists of a MalloryType 6B200 vibrapack and a condenser input single section filter. The Vibrapack uses a 6X5 (or OZ4) type rectifier tube and a Mallory Type 626 vibrator. It should be noted that B- is not connected to the Power Unit chassis; A- is connected to the chassis.

NATIONAL TYPE 1286 TABLE MODEL POWER UNIT

The National Type 1286 Power Unit is similar to the Type 686 Power Unit except that it is designed to operate from 12 volts DC. The Vibrapack is a Mallory 12B200 with a G626 vibrator and an OZ4 rectifier tube. The voltages available at the output socket are 12 volts DC and 165 volts at 45 milliamperes DC. Table I lists typical operating voltages and currents when used with the National HRO-12S Radio Receiver.

NATIONAL TYPE 697 TABLE MODEL POWER URIT

The National Type 697 Table Model Power Unit operates from 115 or 230 volts AC, 50/60 cycles, to provide 240 volts at 70 milliamperes DC and 6.2 volts at 3.4 amperes AC. The circuit diagram of this unit is shown in Figure 2. Output voltage for both A end B supply are available at a four prong socket for convenient plug and cable connection to associated apparatus. Table I lists typical operating voltages and currents when used with the National Type HRO Radio Receiver. Parts Lists are given in Table III.

The Type 697 Power Unit consists of a power transformer, glass Type 80 rectifier tube, and a single section condenser input filter. B- is connected to the Power Unit chassis. The transformer primary and B+ input to the filter are bypassed to one side of the heater supply winding for R.F. filtering. A primary tap selector switch is provided to permit operation from either 115 or 230 volt supply lines.

NATIONAL RACK MOUNTING POWER UNITS

Either of the Table Models 686 or 697 Power Units are available for rack mounting. The National Type numbers for the 686 and 697 Power Units, rack mounted, are SPU-686 and SPU-697, respectively.

Source: Rider National pages 14-35 and 14-36 and "Those National Power Supplies", The Old Timer's Bulletin, Vol 34. (Reprints of the entire article are available from the Antique Wireless Association)

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