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"Easy Hookup" Push-Pull Ultra Linear Tube Output

1650pa-s.jpg

 

Key Features

  • Designed for push-pull tube output circuits.
  • Units are designed to provide ample "headroom" at bass frequencies (note the weight of each transformer).
  • All models have a secondary tapped for 4, 8 or 16 ohm outputs.
  • 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.
  • All units (except the 1650G) include 40% screen taps for Ultra-Linear operation (if desired).
  • Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output. The 1650G does NOT have primary screen taps and will not support "Ultra-Linear" applications.

 

Part
Number

Audio Watts
(RMS)

Primary
Impedance
(Ohms)

Max. DC
Per Side

Secondary
Impedance
(Ohms)

Data Sheet

Reader File

Weight
(lbs.)

1608A
10
8,000 ct
100 ma.
4-8-16
PDF Download
247K
2.5
1609A
10
10,000 ct
100 ma.
4-8-16
PDF Download
247K
2.5
1615A
15
5,000 ct
100 ma.
4-8-16
PDF Download
244K
3.25
1650E 15 8,000 ct 100 ma. 4-8-16
PDF Download
252K
3.5
1620A
20
6,600 ct
158 ma.
4-8-16
PDF Download
246K
3.5
1650FA
25
7,600 ct
128 ma.
4-8-16
PDF Download
245K
4
1645A
30
5,000 ct
128 ma.
4-8-16-70V
PDF Download
264K
4.5
1650G
35
6,600 ct
200 ma.
3.5/8/16/250/500
PDF Download
265K
5
1650HA
40
6,600 ct
200 ma.
4-8-16
PDF Download
247K
6.5
1650KA
50
3,400 ct
318 ma.
4-8-16
PDF Download
244K
7
1650NA
60
4,300 ct
318 ma.
4-8-16
PDF Download
244K
8
1650PA
60
6,600 ct
200 ma.
4-8-16
PDF Download
246K
8
1650RA
100
5,000 ct
318 ma.
4-8-16
PDF Download
247K
12
1650TA
120
1,900 ct
403 ma.
4-8-16
PDF Download
245K
14
1650WA
280
1,900 ct
806 ma.
4-8-16
PDF Download
246K
28 


Suggested Tube Types

 

Part
Number

Audio Watts (RMS)

Primary
Impedance
(Ohms)

Operation

Suggested
Tube Types

1608A
10
8,000 ct
Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
1609A
10
10,000 ct
Push-Pull (2 Tubes)
6AQ5, 6V6, 6BQ5, EL84, SV83
1615A
15
5,000 ct
Push-Pull (2 Tubes)
2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
1650E 15 8,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1620A
20
6,600 ct
Push-Pull (2 Tubes)
6AQ5, 6L6, 6V6
1650FA
25
7,600 ct
Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
1645A
30
5,000 ct
Push-Pull (2 Tubes)
6L6GC, 6V6, 807, 5881, EL34
1650G
35
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34
1650HA
40
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34
1650KA
50
3,400 ct
Push-Pull Par. (4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B
1650NA
60
4,300 ct
Push-Pull Par. (2 or 4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650PA
60
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650RA
100
5,000 ct
Push-Pull Par. (2 or 4 Tubes)
807, 5881, EL34, 6146B, 6550B, KT88
1650TA
120
1,900 ct
Push-Pull Par. (4 or 6 Tubes)
6L6GC, 5881, EL34, 6550B, KT88
1650WA
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

1608A 2.5 2.75 3.06 2 1.69 .203 x .38
1609A 2.5 2.75 3.06 2 1.69 .203 x .38
1615A 2.5 3.25 3.06 2 2.19 .203 x .38
1650E 2.5 3.25 3.06 2 2.5 .203 x .38
1620A 2.5 3.5 3.06 2 2.44 .203 x .38
1650FA 2.5 3.5 3.06 2 2.44 .203 x .38
1645A 2.5 3.75 3.06 2 2.69 .203 x .38
1650G 3.13 3.75 3.81 2.5 2.25 .203 x .38
1650HA 3.13 4 3.81 2.5 2.69 .203 x .38
1650KA 3.13 4 3.81 2.5 2.69 .203 x .38
1650NA 3.13 4.25 3.81 2.5 2.94 .203 x .38
1650PA 3.13 4.25 3.81 2.5 2.94 .203 x .38
1650RA 3.75 4.25 4.56 3 3.06 .203 x .38
1650TA 3.75 4.5 4.56 3 3.31 .203 x .38
1650WA 4.38 7.5 5.25 3.5 5.88 .203 x .38 

 


Schematic & Hook Up Data (All Parts 
except 1645A, 1650E & 1650G - see below)

NEW

 

 Schematic & Hook Up Data (1645A only)

 

1645A Sch.

 

Schematic & Hook Up Data (1650E only)

 

1650E Sch.

 

Schematic & Hook Up Data (1650G only)

 

1650G Schematic

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