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Push-Pull, Ultra-Linear
Tube Output
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1650 Picture

Key Features:

Part Number

Audio Watts
(RMS)

Primary Impedance
(Ohms)

Max. DC
Per Side

Secondary Impedance
(Ohms)

Weight
(lbs.)

1608
10
8,000 ct
100 ma.
4-8-16
2.5
1609
10
10,000 ct
100 ma.
4-8-16
2.5
1615
15
5,000 ct
100 ma.
4-8-16
3.25
1620
20
6,600 ct
158 ma.
4-8-16
3.5
1650F
25
7,600 ct
128 ma.
4-8-16
4
1645
30
5,000 ct
128 ma.
4-8-16-70V
4.5
1650H
40
6,600 ct
200 ma.
4-8-16
6.5
1650K
50
3,400 ct
318 ma.
4-8-16
7
1650N
60
4,300 ct
318 ma.
4-8-16
8
1650P
60
6,600 ct
200 ma.
4-8-16
8
1650R
100
5,000 ct
318 ma.
4-8-16
12
1650T
120
1,900 ct
403 ma.
4-8-16
14
1650W
280
1,900 ct
806 ma.
4-8-16
28 


Suggested Tube Types:

Part Number

Audio Watts (RMS)

Primary
Impedance
(Ohms)

Operation

Suggested Tube Types

1608
10
8,000 ct
Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
1609
10
10,000 ct
Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
1615
15
5,000 ct
Push-Pull (2 Tubes)
2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
1620
20
6,600 ct
Push-Pull (2 Tubes)
6AQ5, 6L6, 6V6
1650F
25
7,600 ct
Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
1645
30
5,000 ct
Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
1650H
40
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34
1650K
50
3,400 ct
Push-Pull Par. (4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B
1650N
60
4,300 ct
Push-Pull Par. (2 or 4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650P
60
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650R
100
5,000 ct
Push-Pull Par. (2 or 4 Tubes)
807, 5881, EL34, 6146B, 6550B, KT88
1650T
120
1,900 ct
Push-Pull Par. (4 or 6 Tubes)
6L6GC, 5881, EL34, 6550B, KT88
1650W
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:

Push-Pull Line Art

Part Number

Dimensions
(Inches)

A

B

C

D

E
+/- 1/16"

G
Slot

1608 2.5 2.75 3.06 2 1.69 .203 x .38
1609 2.5 2.75 3.06 2 1.69 .203 x .38
1615 2.5 3.25 3.06 2 2.19 .203 x .38
1620 2.5 3.5 3.06 2 2.44 .203 x .38
1650F 2.5 3.5 3.06 2 2.44 .203 x .38
1645 2.5 3.75 3.06 2 2.69 .203 x .38
1650H 3.13 4 3.81 2.5 2.69 .203 x .38
1650K 3.13 4 3.81 2.5 2.69 .203 x .38
1650N 3.13 4.25 3.81 2.5 2.94 .203 x .38
1650P 3.13 4.25 3.81 2.5 2.94 .203 x .38
1650R 3.75 4.25 4.56 3 3.06 .203 x .38
1650T 3.75 4.5 4.56 3 3.31 .203 x .38
1650W 4.38 7.5 5.25 3.5 5.88 .203 x .38 


Schematic & Hook Up Data (all models except 1645 - see below):

Push-Pull Schematic


Secondary Connections
(Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications)

Please see our NEW & improved versions (easy wire secondary series).

 Secondary Schematic (4 Ohm)

Secondary Schematic (8 Ohm)

Secondary Schematic (16 Ohm)


Schematic & Hook Up Data (1645 only):

1645 Schematic

 Secondary Schematic (4 Ohm)

Secondary Schematic (8 Ohm)

Secondary Schematic (16 Ohm)



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