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Single Ended-Ultra Linear-Output

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Key Features

  • "Over designed" for high fidelity, single ended, Class-A, tube output circuits (triode, tetrode or pentode tubes).
  • Enclosed (shielded), four slot, chassis Type "X" mounting.
  • Frequency response at least 20 Hz. to 20 Khz. at full rated power (+/- 1 db max., ref. 1 Khz.)
  • Insulated flexible leads 8" min.
  • For maximum versatility, all units (except the 1642SE & 1638SEA) include a 40% screen tap for Ultra-Linear, tetrode/pentode operation (if desired). The 1642SE & 1638SEA do NOT include this screen tap as they were designed principally for high impedance triode tubes.
  • High quality laminations, (M6) grain oriented silicon steel.
  • Core is gapped to reduce core saturation in Class-A tube amplifier circuits.

 

Part Number

Audio
Watts

Primary

Ultra-Linear
40% Primary
Tap

Secondary
Impedance

(Ohms)

Hipot
Test
(VRMS)

Weight
(lbs.)

Impedance
(Ohms)

Max. DC
Bias

Inductance
1640SEA
30
1,250
200 ma.
14 Henrys Yes
4-8-16
2,000
11
1627SEA
30
2,500
160 ma.
20 Henrys Yes
4-8-16
2,000
11
1630SEA
30 3,500 135 ma. 42 Henrys Yes 4-8-16 2,000 11
1628SEA
30
5,000
120 ma.
48 Henrys Yes
4-8-16
2,000
11
1642SE
75 5,000 300 ma. 53 Henrys No 4-8-16
3,500
28
1629SEA
30
6,500
100 ma.
55 Henrys Yes
4-8-16
2,000
11
1638SEA
30 10,000 90 ma. 88 Henrys No 4-8-16
2,000
11

 


Suggested Tube Types

 

Part Number

Triodes

Pentodes

1640SEA

Parallel - 2A3, 6A3, 6B4G, 300B, 572B, 811A

Parallel - 6550, 6CA7

1627SEA

2A3, 6A3, 6B4G, 300B

6CA7, 6L6, 807, 5881, 6550,
Parallel - 6AQ5, 6V6, EL84

1630SEA

2A3, 6A3, 6B4G, 300B

6CA7, 6L6, 807, 5881, 6550,
Parallel - 6AQ5, 6V6, EL84

1628SEA

211, 300B, 572B, 811A

6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84

1642SE
Parallel - 211, 572, 811A, 845
-
1629SEA

211, 811A, 572B, 845

6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84

1638SEA

211, 845

-

 

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 (ultra-linear, bias, plate voltage, operating points, etc.) will change optimum plate load impedance. Only a few of the most popular tubes are shown. 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

 

 

Single Ended Line Art

 

Part Number

Dimensions
(Inches)

A

B

C

D

E

G (slot)

1640SEA
3.75
4.95
4.56
3.00
3.90
.203 x .375
1627SEA
3.75
4.50
4.56
3.00
3.81
.203 x .375
1630SEA
3.75
4.98
4.65
3.00
3.90
.203 x .375
1628SEA
3.75
4.50
4.56
3.00
3.81
.203 x .375
1642SE
4.38
7.50
5.25
3.50
5.88
.203 x .375
1629SEA
3.75
4.50
4.56
3.00
3.88
.203 x .375
1638SEA
3.75
4.875
4.56
3.00
3.90
.203 x .375

 


Schematic & Hook Up Data

 

SE Schematic

Notes:

- RED wire connects to B+
- BLUE/YELLOW wire connects to screen (optional use)
- BLUE wire connects to the tube plate

- The 1642SE & 1638SEA do not include a primary screen tap (as they are designed for triode applications).

 

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