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Table I
Base diagrams

Table II

Table II

Table III
Ballastron substitutions

Table IV
Mfg. Substitutions

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Notes from Table II

(a) For use in operating 2.0-volt tubes from Air-Cell or 3-volt drycell batteries. When used this way, no other resistor is necessary in the filament circuit, and none should be used. When operating from a 2-volt storage cell the ballast tube should be shorted out of the circuit. The voltage drop of this group of ballast tubes is sometimes shown as 1.0 volt, although the actual drop is as shown in this table; depending on the voltage of the battery

(b) For use in receivers desisned for operation on 110 volts, and are usually connected in series with the primary of the power transformer.

(c) For use in place of the resistor type of line cord in A.C.-D.C. receivers operated from 110-volt lines.

(d) Used to operate A.C.-D.C. receivers from a 220-volt line.

(e) Used in place of those in group (b) when operating 110-volt receivers from 150-volt lines.

(f) For use when operating 110-volt receivers from 220-volt lines.

(g) For use with sets designed to operate from 32-volt lighting plants.

(h) For use in the primary circuit of receivers designed for use with a ballast in series with the transformer primary. The primary of the transformer should be designed for the following voltages:

	h1......100 volts	h3.......85 volts 
	h2.......85 volts	h4.......65 volts 
(k-k1) These types are for use in Majestic receivers. Types marked (*) are manufactured by several manufacturers of tubes. The types marked k1 are designed to replace the fixed resistor type line ballasts used as original equipment in Majestic receivers.

(m) To replace the resistor cord in A.C.-D.C. receivers and do not have tap on resistor shown in diagram.

(m-1) Same as above except that they have a tap for operating one 6-8 volt pilot light.

(m-2) Same as group (m) except tap for operating two 6-8 volt pilot lamps.

(n) This type is a voltage regulator rather than a ballast; and is used in some of the older receivers to provide constant voltage from a 90-volt tap of the power supply.


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