Hammond Mfg.-"Classic" Push-Pull-Easy Wire-Tube Output Transformers

"Classic" Audio
Push-Pull, Ultra-Linear
Easy Wire - Tube Output

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Key Features:

NEW & improved version of our 1608-1650 series output transformers (re-designed secondaries for easy hook-up of secondary loads).
Designed for push-pull tube output circuits.
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. Except the 1650E (70 Hz. to 30 Khz. +/- 1 db max. - ref. 1 Khz.)
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.

Cat. No.	Audio Watts (RMS)	Primary Impedance	Max. DC Per Side	Secondary Impedance	Wt. Lbs.
1608A	10	8,000 ct	100 ma.	4-8-16	2.5
1609A	10	10,000 ct	100 ma.	4-8-16	2.5
1615A	15	5,000 ct	100 ma.	4-8-16	3.25
1650E	15	8,000 ct	100 ma.	4-8-16	3.5
1620A	20	6,600 ct	158 ma.	4-8-16	3.5
1650FA	25	7,600 ct	128 ma.	4-8-16	4
1645A	30	5,000 ct	128 ma.	4-8-16-70V	4.5
1650G	35	6,600 ct	200 ma.	3.5/8/16/250/500	5
1650HA	40	6,600 ct	200 ma.	4-8-16	6.5
1650KA	50	3,400 ct	318 ma.	4-8-16	7
1650NA	60	4,300 ct	318 ma.	4-8-16	8
1650PA	60	6,600 ct	200 ma.	4-8-16	8
1650RA	100	5,000 ct	318 ma.	4-8-16	12
1650TA	120	1,900 ct	403 ma.	4-8-16	14
1650WA	280	1,900 ct	806 ma.	4-8-16	28

Suggested Tube Types:

Cat. No.	Audio Watts (RMS)	Primary Impedance	Operation	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:

Cat. No.	Dimensions (Inches)
Cat. No.	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

Schematic & Hook Up Data (All Parts except 1645A, 1650E & 1650G - see below):

Schematic & Hook Up Data (1645A only):

1645A Sch.

Schematic & Hook Up Data (1650E only):

1650E Sch.

Schematic & Hook Up Data (1650G only):

1650G Schematic

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