Hammond Mfg. - Chassis Mount Audio Transformers

Audio
Chassis Mount

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140 Series	143-146 Series

Key Features (140 Series):

The "140" series has been replaced (by a major upgrade) to the NEW studio grade - 140 "EX" series
The "140" part numbers listed below are obsolete - limited availablity until inventory is depleted.
Insulated leads 5" (127mm) long minimum
Stamped steel case - Diameter of 1.25" (31.8mm) and height of 1" (25.4mm) for excellent shielding - low hum pick-up.
Frequency response 70 Hz. - 11 Khz. (+/- 1 db, ref. @ 1 Khz.)
Case bracket - mounting hole centers are 1.9" (48.3mm)
Net weight 2 oz.

Part Number	Obsolete Status	Application	Nominal Impedance (Ohms)		Overall Turns Ratio
Part Number	Obsolete Status	Application	Primary	Secondary	Pri. to Sec.
140A	Limited Availability (check stock)	Voice Coil to Single Grid	4	60000	1:122
140B	*No Longer Available*	Dyn. MIC. to Single Grid	30	60000	1:45
140C	*No Longer Available*	MIC. to Single Grid	50	60000	1:34.5
140H	*No Longer Available*	Bridging Line to P.P. Grids	10000	40000 ct	1:2
140K	Limited Availability (check stock)	MIC. to Single Grid	150	60000	1:2
140M	*No Longer Available*	CRYS, MIC. to Base	100K	1500	8:1
140N	Limited Availability (check stock)	Dyn. MIC to Base	50	1500	1:5.5
140P	*No Longer Available*	Line to Base	150/600	600/2400	1:2
140Q	Limited Availability (check stock)	Line to Line	600 ct	600 ct	1:1

Link here to: upgraded studio grade - 140 "EX" series

click to enlarge

Key Features (143-146 Series):

Small, economical, open, two hole horizontal bracket mount.
Insulated, color coded flexible leads, 4" long minimum (143, 144 & 145 Series) or 3" long minimum (146 Series).
For a similar, P.C. board mount version, refer to our 148 & 149 Series.
Frequency response 150 Hz. to 15 Khz. (+/- 1 db, reference 1000 Hz.)
When operating at impedances below nominal, power capability and the frequency spectrum are proportionately lower, conversely, at higher impedances power capability and frequency spectrum will be proportionately higher.
Net weight: 0.5 oz. (143, 144, 146 Series) & 1.4 oz. (145 Series).

Part Number	Applicaton	Nominal Impedance (Ohms)		Pri. D.C. (*1) ma	D.C. Resistance (Ohms) +/- 15%		Output mW	Schematic
Part Number	Applicaton	Primary	Secondary	Pri. D.C. (*1) ma	Primary	Secondary	Output mW	Schematic
143B	Input	3.2	4000	0	0.4	245	15	1
143D	Input	200K	1000	0	4500	30	25	1
143H	Driver	1500	500 ct	4	111	24	30	2
143J	Driver	3000	1000 ct	2.6	265	53	30	2
143L	Driver	10000	200 ct	1.5	720	9	30	2
143N	Driver	10000	2000 ct	1.5	720	89	30	2
143R	Driver	25000	600 ct	1	1890	25	30	2
144B	Output	200 ct	3.2	10	10	0.33	150	3
144D	Output	300 ct	3.2	9	15	0.33	150	3
144F	Output	500 ct	3.2	6	27	0.33	150	3
144G	Output	500 ct	8	6	27	0.9	150	3
144H	Output	500 ct	50	6	28	7.3	150	3
144I	Output	600 ct	150 ct	6	45	8.2	150	4
144P	Output	10000	3.2	5	575	0.5	50	1
144Q	Output	10000	8	5	575	0.9	50	1
144S	Output	20000	8	3.5	1240	0.9	50	1
145A	Driver	100	200 ct	45	14	19	100	2
145B	Driver-Output	600	600	18	30	38	200	1
145C	Input	50000	1500 ct	1	2400	52	50	2
145D	Input	200K	1000	0.5	3600	33	10	1
145E	Input-Output	600 ct	600 ct	5	65	83	200	4
145F	Driver	600 ct	200 ct	20	45	9	135	4
145G	Driver	2000	200 ct	12	140	9	135	2
145H	Driver	2000	500 ct	12	148	17	135	2
145J	Driver	4000	600 ct	8	340	24	135	2
145L	Driver	4000	2600 ct	8	340	100	135	2
145N	Driver	10000	2000 ct	5	700	89	135	2
145O	Driver	15000	200 ct	4	850	10	135	2
145P	Driver	20000	1000 ct	3.5	1180	50	135	2
145R	Driver	20000	2000 ct	3.5	1180	89	135	2
146B	Output	48 ct	3.2	20	2.4	0.3	700	3
146C	Output	48 ct	8	20	2.4	0.7	700	3
146D	Output	100 ct	3.2	14	4.4	0.3	700	3
146E	Output	100 ct	8	14	4.4	0.7	700	3
146F	Output	250 ct	3.2	8	11	0.3	700	3
146G	Output	250 ct	8	8	11	0.7	700	3
146H	Output	500 ct	3.2	6	26	0.3	700	3
146I	Output	500 ct	8	6	26	0.7	700	3
146J	Output	1000 ct	3.2	4	56	0.3	700	3
146K	Output	1000 ct	8	4	56	0.7	700	3
146N	Output	2000 ct	8	3	97	0.7	700	3
146S	Output	4000 ct	8	2	220	0.7	700	3

Notes: *1 - For output transformers this figure is maximum unbalance

Mechanical & Schematic Data:

Series Number	Dimensions (Inches)
Series Number	A	B	C	D
143...	1.35	0.69	0.69	1.06
144...	1.35	0.69	0.69	1.06
145...	1.63	0.88	0.81	1.38
146...	1.63	0.88	0.81	1.38


Schematic 1	Schematic 2	Schematic 3	Schematic 4

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