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Output-"Easy Hookup" Push-Pull Ultra Linear

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

(click for price

 and to order)

 

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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