The Audio Type Transformers 1627 to 1642 series. "Classic" single ended ultra-linear tube output transformers.

 

 

Key Features:

  • Over designed for single ended tube output circuits (triode, tetrode or pentode tubes).

  • For general purpose or replacement use in single ended tube output circuits see our 125SE Series. 

  • Enclosed (shielded), 4 slot, above chassis Type "X" mounting, both end bells include knockouts for optional above chassis wiring.

  • Frequency response at least 20 Hz. to 20 Khz. at full rated power (+/- 1 db max. ref. 1 Khz.)

  • Insulated flexible leads 8" min.

  • All units (except the 1642SE) include a 40% screen tap for Ultra-Linear operation (if desired). The 1642SE does NOT include this screen tap.

  • High quality laminations, (M6) grain oriented silicon steel

P#

Audio Watts

Primary

Secondary Impedance

Wt. Lbs.

Impedance

Max. DC Bias

EID-1627SE

25

2,500

132 ma.

4-8-16

11

EID-1628SE

25

5,000

132 ma.

4-8-16

11

EID-1629SE

25

6,500

167 ma.

4-8-16

11

EID-1640SE

25

1,250

336 ma.

4-8-16

11

EID-1642SE

75

5,000

213 ma.

4-8-16

28

 

Suggested Tube Types:

 

P#

Triodes

Pentodes

EID-1627SE

2A3, 6A3, 6B4G, 300B

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

EID-1628SE

SV572-3, SV572-10, SV811-3, 211, 300B

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

EID-1629SE

SV572-30, SV572-160, SV811-10, 811A, 572B

-

EID-1640SE

Parallel - SV811-3, 2A3, 6A3, 6B4G, 300B

Parallel - 6550, 6CA7

EID-1642SE

SV-572-3, SV572-10, SV572-30, SV572-160, 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, class, B+, bias, operating points, etc.) will change optimum 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.

 

Test Data:

 

P#

Primary Winding Data

Inductance
(Minimum)

DC Resistance
(+/- 20%)

EID-1627SE

21 H

280 Ohms

EID-1628SE

79.6 H

355 Ohms

EID-1629SE

159 H

492 Ohms

EID-1640SE

25 H

89.7 Ohms

EID-1642SE

53 H

240 Ohms

 

Mechanical Data:

Single Ended Line Art

 

P#

Dimensions (Inches)

A

B

C

D

E

G (slot)

EID-1627SE

3.75

5.00

4.56

3.00

3.81

.203 x .38

EID-1628SE

3.75

5.00

4.56

3.00

3.81

.203 x .38

EID-1629SE

3.75

5.00

4.56

3.00

3.81

.203 x .38

EID-1640SE

3.75

5.00

4.56

3.00

3.81

.203 x .38

EID-1642SE

4.38

7.50

5.25

3.50

5.88

.203 x .38

 

Schematic & Hook Up Data (except 1642SE):

 

Single Ended Schematic

 


Secondary Connections

 

 Secondary Schematic (4 Ohm)

Secondary Schematic (8 Ohm)

Secondary Schematic (16 Ohm)


Note: 

 

The 1642SE does not include a primary screen tap. It also uses easy hook up secondary taps (ie...16 ohm full winding with taps at 4 and 8 ohms).

 

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