Hammond Single Ended Tube Output Transformers - (1627

"Classic" Audio
Single Ended, Ultra-Linear
Tube Output

1640 Picture

Key Features:

NEW & IMPROVED versions, higher power handling, smoother frequency response, two new impedances added & easy to use secondary taps.
"Over designed" for 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 circuits.
For general purpose or replacement use in single ended tube output circuits see our 125SE series.

Part No.	Audio Watts	Primary			Ultra-Linear 40% Primary Tap	Secondary Impedance	Hipot Test (VRMS)	Wt. Lbs.
Part No.	Audio Watts	Impedance	Max. DC Bias	Inductance	Ultra-Linear 40% Primary Tap	Secondary Impedance	Hipot Test (VRMS)	Wt. Lbs.
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 No.	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 favourite 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:

Cat. No.	Dimensions (Inches)
Cat. No.	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	3.13	.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	3.13	.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	4.50	4.56	3.00	3.13	.203 x .375

Schematic & Hook Up Data:

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).