Push - Pull
Audiophile - Output (1608-1650 "A" Series)
Suggested Tube Types
Part
Number
1608A
1609A
1615A
1650E
1620A
1650FA
1645A
1650G
1650HA
1650KA
1650NA
1650PA
1650RA
1650TA
1650WA
Audio Watts
(RMS)
10
10
15
15
20
25
30
35
40
50
60
60
100
120
280
Primary
Impedance
8,000 C.T.
10,000 C.T.
5,000 C.T.
8,000 C.T.
6,600 C.T.
7,600 C.T.
5,000 C.T.
6,600 C.T.
6,600 C.T.
3,400 C.T.
4,300 C.T.
6,600 C.T.
5,000 C.T.
1,900 C.T.
1,900 C.T.
Operation
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull (2 Tubes)
Push-Pull Par. (4 Tubes)
Push-Pull Par. (2 or 4 Tubes)
Push-Pull (2 Tubes)
Push-Pull Par. (2 or 4 Tubes)
Push-Pull Par. (4 or 6 Tubes)
Push-Pull Par. (6 or 8 Tubes)
Tube Types
6AQ5, 6V6, 6BQ5, EL84, SV83
6AQ5, 6V6, 6BQ5, EL84, SV83
2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
6AQ5, 6V6, 6BQ5, EL84, SV83
6AQ5, 6L6, 6V6
6L6GC, 6V6, 807, 5881, EL34
6L6GC, 6V6, 807, 5881, EL34
6L6GC, 807, 5881, EL34
6L6GC, 807, 5881, EL34
6L6GC, 807, 5881, EL34, 6146B, 6550B
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
807, 5881, EL34, 6146B, 6550B, KT88
6L6GC, 5881, EL34, 6550B, KT88
6L6GC, 5881, EL34, 6550B, KT88
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
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.
Schematic
All Parts Except 1645A, 1650E & 1650G
Blu
(Plate)
Blu/Yel
(Screen Gr)
Red B+
Brn/Yel
(Screen Gr)
Brn
(Plate)
Grn (4 Ohm)
White (16 Ohm)
Blu
(Plate)
Blu/Yel
(Screen Gr)
Red B+
Brn/Yel
(Screen Gr)
Brn
(Plate)
Schematic
1645A Only
Org (70 V)
Tube Audio
Yel (8 Ohm)
White (16 Ohm)
Yel (8 Ohm)
Grn (4 Ohm)
Blk (0 Ohm)
Black (0 Ohm)
PRI
SEC
PRI
SEC
Schematic - 1650E Only
Blu
(Plate)
Blu/Yel
(Screen Gr)
Red B+
Brn/Yel
(Screen Gr)
Brn
(Plate)
Blk/Red (4 Ohm)
Green (16 Ohm)
Blu
(Plate)
Red B+
Brn
(Plate)
Schematic - 1650G Only
Red/Yel (500 Ohm)
Blk/Yel (250 Ohm)
Yel (16 Ohm)
Grn (8 Ohm)
Org (3.5 Ohm)
Blk/Grn (8 Ohm)
Blk (0 Ohm)
Black (0 Ohm)
PRI
EUROPE
SEC
PRI
www.hammondmfg.com
SEC
Guelph, Ontario (519) 822-2960
St. Laurent, Quebec (514) 343-9010
Cheektowaga, NY (716) 630-7030
Basingstoke, UK 01256 812812
Queenstown, Australia 61-8-8240-2244
CANADA
USA
AUSTRALIA
93
©
HAMMOND [ Hammond Manufacturing Ltd. ]
