1650 Picture"Classic" - Push-Pull - Ultra Linear - Tube Output

Key Features:

Cat. No.

Audio Watts (RMS)

Primary Impedance

Max. DC Per Side

Secondary Impedance

Wt. Lbs.

Operation

Tube Types

Price

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1608
10
8,000 ct
100 ma.
4-8-16
2.5
 Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
 $116.81

1609
10
10,000 ct
100 ma.
4-8-16
2.5
 Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
 $116.81

1615
15
5,000 ct
100 ma.
4-8-16
3.25
 Push-Pull (2 Tubes)
2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
 $130.01

1620
20
6,600 ct
158 ma.
4-8-16
3.5
 Push-Pull (2 Tubes)
6AQ5, 6L6, 6V6
 $143.25

1650F
25
7,600 ct
128 ma.
4-8-16
4
 Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
 $149.86

1645
30
5,000 ct
128 ma.
4-8-16-70V
4.5
 Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
 $174.11

1650H
40
6,600 ct
200 ma.
4-8-16
6.5
 Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34
 $174.11

1650K
50
3,400 ct
318 ma.
4-8-16
7
 Push-Pull Par. (4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B
 $182.91

1650M 60 1,400 ct/800ct 318 ma. 4-8-16 7.5     $248.69

1650N
60
4,300 ct
318 ma.
4-8-16
8
 Push-Pull Par. (2 or 4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
 $187.32

1650P
60
6,600 ct
200 ma.
4-8-16
8
 Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
 $187.32

1650R
100
5,000 ct
318 ma.
4-8-16
12
 Push-Pull Par. (2 or 4 Tubes)
807, 5881, EL34, 6146B, 6550B, KT88
 $209.34

1650T
120
1,900 ct
403 ma.
4-8-16
14
 Push-Pull Par. (4 or 6 Tubes)
6L6GC, 5881, EL34, 6550B, KT88
 $220.39

1650W
280
1,900 ct
806 ma.
4-8-16
28 
 Push-Pull Par. (6 or 8 Tubes)
6L6GC, 5881, EL34, 6550B, KT88
 $447.58

 

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

 

Cat. No.

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
1650M 3.13 4.19 3.80 2.5 2.94 .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 (except 1650E, 1645 & 1650G - 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)

NOTE:
Primary & secondary connections above, do NOT include the 1650G.
The primary of only the 1650G does not include screen taps (see below).
The 1650G has a single secondary winding, tapped at each impedance point.

Schematic & Hook Up Data (1650E only):
 

1650E Schematic

To hook up secondary loads simply use Com (Common wire - Blk) and the corresponding wire for the secondary load required (ie...for an 8 Ohm load use the Blk and Blk/Grn wire).

Schematic & Hook Up Data (1650G only):
 

1650G Schematic

To hook up secondary loads simply use Com (Common wire - Blk) and the corresponding wire for the secondary load required (ie...for an 8 Ohm load use the Blk and Grn wire).
 

Schematic & Hook Up Data (1645 only):

1645 Schematic

11-11-2022