1627SEA 30 2500 160 ma. 20 Henrys Yes 4-8-16 2000 11 3.75 4.50 4.56 3.00 3.81 0.20 x 0.38
1630SEA 30 3500 135 ma. 42 Henrys Yes 4-8-16 2000 11 3.75 4.98 4.65 3.00 3.90 0.20 x 0.38
1628SEA 30 5000 120 ma. 48 Henrys Yes 4-8-16 2000 11 3.75 4.50 4.56 3.00 3.81 0.20 x 0.38
1642SE 75 5000 300 ma. 53 Henrys No 4-8-16 3500 28 4.38 7.50 5.25 3.50 5.88 0.20 x 0.38
1629SEA 30 6500 100 ma. 55 Henrys Yes 4-8-16 2000 11 3.75 4.50 4.56 3.00 3.88 0.20 x 0.38
1638SEA 30 10000 90 ma. 88 Henrys No 4-8-16 2000 11 3.75 4.88 4.56 3.00 3.90 0.20 x 0.38
Part No.
Audio
Primary Ultra-Linear Secondary Hipot
Weight Overall Dimensions
Mounting
Impedance Max. DC
Inductance
40% Primary Impedance Test Slot
Watts (Ohms) Bias Tap (Ohms) (VRMS) (lbs.) A B C D E G
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).
Suggested Tube Types:
Part No. Triodes Pentodes
1626SEA 6C33 -
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.
