Audio Transformers

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• AUDIO TRANSFORMERS •

INPUT, INTERSTAGE, AND OUTPUT TYPES

PHILCO Audio Transformers for all makes of radio are designed for general service and experimental work. They are constructed of the finest materials, and are all listed at new extremely low prices. Special vacuum impregnating treatment assures permanent trouble-free operation. The large cores afford highly efficient response at all audio frequencies. Many of the transformers listed below are shielded in heavy metal housings, finished in black enamel.

AUDIO TRANSFORMERS
INPUT AND INTERSTAGE
For Coupling Between Tubes	Ratio	Part No.
27 and 45, 47, 42 or 71-A	1 : 1	6064
	1 : 1	5662*
	1 : 2	3872
	1 : 3	4952
	1 : 4	4232
	1 : 4	3537*
27 and P.P. 45, 47, 42 or 71-A	1 : 1	6064
	1 : 1**	5662*
	1 : 2**	3872
	1 : 3	4952
	1 : 4	4232
	1 : 4**	3537*
27 and 26** or 26 and P.P. 45, 71-A, 31, 50	1 : 4	3242
30 and 33	1 : 4	5315
27 and P.P. 71-A	1 : 2.2	4862
27 and P.P. 71-A	1 : 4	6582
OUTPUT TRANSFORMERS
For Use With Output Tubes	Ratio	For Voice Coil Impedance in Ohms	Part No.
Single 47 or 42	100 : 1**	.65	2766**
	90 : 1**	.85	2673
	87 : 1	.85	2660
	76 : 1	1.25	2580
	53 : 1	2.50	2564
	27 : 1	10.00	2526
Push-Pull 47's or 42's	135 : 1**	.65	2635
	160 : 1	.75	2565
	100 : 1	1.25	2585
	38 : 1	10.00	2525
Single 45 or 71-A	70 : 1	.65	2706
Single 45 or 71-A	20 : 1	10.00	2524
Push-Pull 45's, 71-A's or 50's	100 : 1**	.65	2766
Single 33	92 : 1	.85	2646
Single 41	93 : 1	.65	2598
* Extra large core. ** Push-pull center tap not used.