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Push-Pull Ultra Linear Tube Output

1650 Picture

 

Key Features

 

  • 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.
  • 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).

 

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)


 

 Secondary Schematic (4 Ohm)

 

Secondary Schematic (8 Ohm)

 

Secondary Schematic (16 Ohm)

Schematic & Hook Up Data (1645 only)

1645 Schematic

  • Secondary Connections (Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications)
  • To hook up 4/8/16 ohm secondary loads - see "Secondary Connections" data below (do not use the white wire).
  • To hook up secondary to 70V loads, jumper Blk/Yel wire to Grn wire. Connect load to Blk and White wires.
 

 

 Secondary Schematic (4 Ohm)

 

Secondary Schematic (8 Ohm)

 

Secondary Schematic (16 Ohm)
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