Hammond Mfg. Co. Ltd., Electronics Division
www.hammondmfg.com
1750J
PRIMARY
BRN
TUBE GUITAR AMPLIFIER - OUTPUT TRANSFORMER
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Designed for drop in replacement of original
units.
Constructed to look similar to original factory
units (where possible).
Material used & design specifications were kept
as close as possible to the original part to
preserve the stock "tone".
Open style with minimum 9" long primary and
secondary leads
Frequency response 70Hz - 15KHz
(0/-1.5dB reference @ 1KHz)
Distortion is less than 3% @ 70Hz
SECONDARY
BLK COM
4000 CT
Ohms
RED
BLU
40 WATTS
70Hz - 15kHz
GRN 4 Ohms
BLK
DA
ELECTRICAL SPECIFICATIONS
Characteristics
Input Impedance
Output Impedance
Output Power
Typical
4000 Ohms
4 Ohms
40W
DCR
Primary Brown-Blue
Secondary Black-Green
185.0 Ohms
0.400 Ohm
Inductance
Impedance
Primary Blue-Brown
@ 1.0 kHz, 1.0 V OC
19.8H
120K Ohm
Leakage Inductance
Primary Blue-Brown
@ 1.0 kHz, 1.0 V SC
227.3mH
Dielectric Strength
Temperature Range
1500VRMS
-40 to 105 degC
TEST CONDITIONS
Measurement instruments:
D scope series iii audio analyzer
Wayne Kerr 3255B with a 3265B
Keithley 2010 DVM
Hp4192a impedance analyzer
TE
C
17
GRN
BR 40
W
N
BL - R ATT
K ED
S
M A - G R - BL 70
DE N: U: Hz
I N 4 40 - 1 5
00
CA
C kH z
NA
T
DA
50
J
B
BLU
RED
A
D
G
BRN
NOTE: ALL LEADS 9" LONG MIN.
Dimensions
A 4.000” ±0.063
B 2.800” REF
C 2.63" MAX
D
G
3.560” ±0.063
0.187” ±0.015
TYPICAL TEST CIRCUIT
PRIMARY
R S/
SECONDARY
2
RL
* All graphs input level 27dBu @1.0KHz reference.
**The results are typical and are subject to normal manufacturing and
electrical tolerances.
R S/
OUT
2
www.hammondmfg.com
This drawing and the information in it is the property of Hammond Manufacturing. It may not be reproduced, transmitted or used in any manner whatsoever without the written permission
of Hammond Manufacturing. Data subject to change without notice.
www.hammondmfg.com
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