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Home > Transformers > Hammond "Classic" Single-Ended Ultra-Linear Tube Output Transformers
Hammond "Classic" Single-Ended Ultra-Linear Tube Output Transformers
NEW & IMPROVED versions, higher
power handling, smoother frequency
response, two new impedances added and easy to use secondary taps.
"Over designed" for single-ended Class-A tube output circuits (triode,
tetrode or pentode tubes). Enclosed (shielded), four slot mount,
chassis type "X" mounting. Frequency Response at least 20HZ to 20Khz at
full rated power plus or minus 1 db max., reference 1Khz. Insulated
flexible leads 8" minimum. All units except the 1642SE include a 40%
screen tap for Ultra-Linear tretrode/triode operation (if desired). The
1642SE does not include this screeen tap as it ws designed principally
for higher power, parallel connected, high impedance triode tubes. High
quality laminations, (M6) grain oriented silicon steel. Core is gapped
to reduce core saturation in Class-A circuits. See Hammond's website
for additional information.
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1640SEA 30W, 1.25K, 200 ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
1627SEA 30W, 2.5K, 160ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
1630SEA 30W, 3.5K, 135ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
1628SEA 30W, 5K, 120ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
1629SEA 30W, 6.5K, 100ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
1638SEA 30W, 10K, 90ma, Ultralinear tap 40%, 4/8/16 ohm, 2,000VRMS Hipot Test
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.
- For general purpose or replacement use in single ended tube
output circuits see our 125SE series.
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Part No.
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Audio
Watts
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Primary
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Ultra-Linear
40% Primary
Tap
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Secondary
Impedance
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Hipot
Test
(VRMS)
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Wt. Lbs.
|
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Impedance
|
Max. DC Bias
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Inductance
|
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1640SEA
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30
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1,250
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200 ma.
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14 Henrys
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Yes
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4-8-16
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2,000
|
11
|
|
1627SEA
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30
|
2,500
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160 ma.
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20 Henrys
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Yes
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4-8-16
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2,000
|
11
|
|
1630SEA
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30
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3,500
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135 ma.
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42 Henrys
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Yes
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4-8-16
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2,000
|
11
|
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1628SEA
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30
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5,000
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120 ma.
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48 Henrys
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Yes
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4-8-16
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2,000
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11
|
|
1642SE
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75
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5,000
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300 ma.
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53 Henrys
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No
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4-8-16
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3,500
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28
|
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1629SEA
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30
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6,500
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100 ma.
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55 Henrys
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Yes
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4-8-16
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2,000
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11
|
|
1638SEA
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30
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10,000
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90 ma.
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88 Henrys
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No
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4-8-16
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2,000
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11
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Suggested Tube Types:
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Part No.
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Triodes
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Pentodes
|
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1640SEA
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Parallel - 2A3, 6A3, 6B4G, 300B, 572B, 811A
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Parallel - 6550, 6CA7
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1627SEA
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2A3, 6A3, 6B4G, 300B
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6CA7, 6L6, 807, 5881, 6550,
Parallel - 6AQ5, 6V6, EL84
|
|
1630SEA
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2A3, 6A3, 6B4G, 300B
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6CA7, 6L6, 807, 5881, 6550,
Parallel - 6AQ5, 6V6, EL84
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1628SEA
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211, 300B, 572B, 811A
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6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84
|
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1642SE
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Parallel - 211, 572, 811A, 845
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-
|
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1629SEA
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211, 811A, 572B, 845
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6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84
|
|
1638SEA
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211, 845
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-
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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:
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Cat. No.
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Dimensions (Inches)
|
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A
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B
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C
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D
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E
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G (slot)
|
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1640SEA
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3.75
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4.95
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4.56
|
3.00
|
3.90
|
.203 x .375
|
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1627SEA
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3.75
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4.50
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4.56
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3.00
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3.13
|
.203 x .375
|
|
1630SEA
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3.75
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4.98
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4.65
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3.00
|
3.90
|
.203 x .375
|
|
1628SEA
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3.75
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4.50
|
4.56
|
3.00
|
3.13
|
.203 x .375
|
|
1642SE
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4.38
|
7.50
|
5.25
|
3.50
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5.88
|
.203 x .375
|
|
1629SEA
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3.75
|
4.50
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4.56
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3.00
|
3.88
|
.203 x .375
|
|
1638SEA
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3.75
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4.50
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4.56
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3.00
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3.13
|
.203 x .375
|
|
Schematic & Hook Up Data:
|
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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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Hammond Output Transformer 1627SEA
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Hammond Output Transformer 1628SEA
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Hammond Output Transformer 1629SEA
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Hammond Output Transformer 1630SEA
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Hammond Output Transformer 1638SEA
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Hammond Output Transformer 1640SEA
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