Hammond Mfg. Co. Ltd., Electronics Division
www.hammondmfg.com
1650N
"CLASSIC" PUSH-PULL TUBE TYPE
ULTRA-LINEAR OUTPUT TRANSFORMERS
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.
Insulated flexible leads 8" min.
Manufactured with plastic coil forms for coil support and insulation.
Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio
output.
Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet
specifications (see hook-up diagrams below).
Suggested tube types: 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
ELECTRICAL SPECIFICATIONS
Characteristic
Input Impedance
Output Impedance
Output Power
Typical
4300 Ohms
4, 8 & 16 Ohms
60 Watts
DCR
Primary - BlueBrown
Secondary Black-Green
Secondary Black/Yel-Yel
82.5 Ohms
0.230 Ohm
0.370 Ohm
Inductance | Impedance
Primary Brown-Red
@ 60Hz, 10.0V OC
134H
59KOhm
Leakage Inductance
Primary Brown-Red
@ 60Hz, 10.0V SC
7.72mH
Dielectric Strength
Temperature Range
2000Vrms
-40 To 105C
LABEL:
1650N
M a d e In C a n a d a
DATE
Note: 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
4040 watts manufacturer's technical data sheets should be consulted first, before making a decision on a proper output transformer.
Hammond Mfg. Co. Ltd., Electronics Division
www.hammondmfg.com
DIMENSIONAL DETAILS:
YEL
GRN/YEL
BLK/YEL
GRN
BLK
BLU
BLU/YEL
RED
BRN/YEL
BRN
2.500in
±0.063
3.125in
Ø0.203 x 0.375
±0.063
3.813in
±0.063
TEST CONDITIONS
Measurement Instruments:
dScope Series III Audio Analyzer
Wayne Kerr 3255B with a 3265B Inductance Analyzer
HP 4192a LF Impedance Analyzer
Keithley 2010 DVM
* All graphs input level 27dBu @1.0KHz reference.
**The results are typical and are subject to normal manufacturing and
electrical tolerances.
4.250in
2.940in
±0.125
±0.063
TYPICAL TEST CIRCUIT
PRIMARY
R S/
SECONDARY
2
RL
R S/
OUT
2
This drawing and the information in it is the property of Hammond Manufacturing. It may not be reproduced, transmitted or use d in any manner whatsoever without the written permission of
Hammond Manufacturing. Data subject to change without notice.
Hammond Mfg. Co. Ltd., Electronics Division
www.hammondmfg.com
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