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Output-"Easy Hookup" Push-Pull Ultra Linear

Key Features

Designed for push-pull tube output circuits.
Units are designed to provide ample "headroom" at bass frequencies (note the weight of each transformer).
All models have a secondary tapped for 4, 8 or 16 ohm outputs.
Enclosed (shielded), 4 slot, above chassis Type "X" mounting.
Frequency response 30 Hz. to 30 Khz. at full rated power (+/- 1 db max. - ref. 1 Khz) minimum.
Insulated flexible leads 8" min.
All units (except the 1650G) include 40% screen taps for Ultra-Linear operation (if desired).
Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output. The 1650G does NOT have primary screen taps and will not support "Ultra-Linear" applications.

Part Number (click for price and to order)	Audio Watts (RMS)	Primary Impedance (Ohms)	Max. DC Per Side	Secondary Impedance (Ohms)	Data Sheet Reader File	Weight (lbs.)
1608A	10	8,000 ct	100 ma.	4-8-16	247K	2.5
1609A	10	10,000 ct	100 ma.	4-8-16	247K	2.5
1615A	15	5,000 ct	100 ma.	4-8-16	244K	3.25
1650E	15	8,000 ct	100 ma.	4-8-16	252K	3.5
1620A	20	6,600 ct	158 ma.	4-8-16	246K	3.5
1650FA	25	7,600 ct	128 ma.	4-8-16	245K	4
1645A	30	5,000 ct	128 ma.	4-8-16-70V	264K	4.5
1650G	35	6,600 ct	200 ma.	3.5/8/16/250/500	265K	5
1650HA	40	6,600 ct	200 ma.	4-8-16	247K	6.5
1650KA	50	3,400 ct	318 ma.	4-8-16	244K	7
1650NA	60	4,300 ct	318 ma.	4-8-16	244K	8
1650PA	60	6,600 ct	200 ma.	4-8-16	246K	8
1650RA	100	5,000 ct	318 ma.	4-8-16	247K	12
1650TA	120	1,900 ct	403 ma.	4-8-16	245K	14
1650WA	280	1,900 ct	806 ma.	4-8-16	246K	28

Suggested Tube Types

Part Number	Audio Watts (RMS)	Primary Impedance (Ohms)	Operation	Suggested Tube Types
1608A	10	8,000 ct	Push-Pull (2 Tubes)	6AQ5, 6V6, 6BQ5, EL84, SV83
1609A	10	10,000 ct	Push-Pull (2 Tubes)	6AQ5, 6V6, 6BQ5, EL84, SV83
1615A	15	5,000 ct	Push-Pull (2 Tubes)	2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
1650E	15	8,000 ct	Push-Pull (2 Tubes)	6AQ5, 6V6, 6BQ5, EL84, SV83
1620A	20	6,600 ct	Push-Pull (2 Tubes)	6AQ5, 6L6, 6V6
1650FA	25	7,600 ct	Push-Pull (2 Tubes)	6L6GC, 6V6, 807, 5881, EL34
1645A	30	5,000 ct	Push-Pull (2 Tubes)	6L6GC, 6V6, 807, 5881, EL34
1650G	35	6,600 ct	Push-Pull (2 Tubes)	6L6GC, 807, 5881, EL34
1650HA	40	6,600 ct	Push-Pull (2 Tubes)	6L6GC, 807, 5881, EL34
1650KA	50	3,400 ct	Push-Pull Par. (4 Tubes)	6L6GC, 807, 5881, EL34, 6146B, 6550B
1650NA	60	4,300 ct	Push-Pull Par. (2 or 4 Tubes)	6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650PA	60	6,600 ct	Push-Pull (2 Tubes)	6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650RA	100	5,000 ct	Push-Pull Par. (2 or 4 Tubes)	807, 5881, EL34, 6146B, 6550B, KT88
1650TA	120	1,900 ct	Push-Pull Par. (4 or 6 Tubes)	6L6GC, 5881, EL34, 6550B, KT88
1650WA	280	1,900 ct	Push-Pull Par. (6 or 8 Tubes)	6L6GC, 5881, EL34, 6550B, KT88

Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc.) will change optimum plate to plate load impedance. Only a few of the most popular tubes are shown. As more tubes become available we will add them to the list. A tube manual or tube manufacturer's technical data sheets should be consulted first, before making a decision on a proper output transformer.

Mechanical Data

Part Number	Dimensions (Inches)
Part Number	A	B	C	D	E +/- 1/16"	G Slot
1608A	2.5	2.75	3.06	2	1.69	.203 x .38
1609A	2.5	2.75	3.06	2	1.69	.203 x .38
1615A	2.5	3.25	3.06	2	2.19	.203 x .38
1650E	2.5	3.25	3.06	2	2.5	.203 x .38
1620A	2.5	3.5	3.06	2	2.44	.203 x .38
1650FA	2.5	3.5	3.06	2	2.44	.203 x .38
1645A	2.5	3.75	3.06	2	2.69	.203 x .38
1650G	3.13	3.75	3.81	2.5	2.25	.203 x .38
1650HA	3.13	4	3.81	2.5	2.69	.203 x .38
1650KA	3.13	4	3.81	2.5	2.69	.203 x .38
1650NA	3.13	4.25	3.81	2.5	2.94	.203 x .38
1650PA	3.13	4.25	3.81	2.5	2.94	.203 x .38
1650RA	3.75	4.25	4.56	3	3.06	.203 x .38
1650TA	3.75	4.5	4.56	3	3.31	.203 x .38
1650WA	4.38	7.5	5.25	3.5	5.88	.203 x .38