1608A-1650A Output Transformer Series

Tube Output (10 - 280 Watts) Easy Wire Secondary 1608A-1650A Series

(Click here for original 1608a to 1650a below )

Features

  • A NEW & improved version of our 1608-1650 Series multiple secondary output transformers (re-designed secondaries for easy hook-up of secondary loads).
  • Designed for push-pull tube output circuits.
  • Units are designed to provide ample "headroom" at bass frequencies (note the weight of each transformer).
  • All models have a secondary tapped for 4, 8 or 16-ohm outputs.
  • Enclosed (shielded), 4 slots, above chassis Type "X" mounting.
  • Manufactured with plastic coil forms for coil support and insulation.
  • Frequency response 30 Hz. to 30 Khz. at full rated power (+/- 1 db max. - ref. 1 Khz) minimum.
  • Insulated flexible leads 8" min.
  • All units (except the 1650G) include 40% screen taps for Ultra-Linear operation (if desired).
  • Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output.
  • The 1650G does NOT have primary screen taps and will not support "Ultra-Linear" applications.

 

Easy Wire Transformers (PDF here)

Part No. Audio Primary Maximum Secondary Dimensions Weight
Watts Impedance DC Impedance A B C D E G
(RMS) (Ohms) Per Side (Ohms) +/- 1/16" Slot (lbs.)
1608A 10 8,000 ct 100 ma. 4-8-16 64 70 78 51 43 5 x 10 2.5
1609A 10 10,000 ct 100 ma. 4-8-16 64 70 78 51 43 5 x 10 2.5
1615A 15 5,000 ct 100 ma. 4-8-16 64 83 78 51 56 5 x 10 3.25
1650E 15 8,000 ct 100 ma. 4-8-16 64 83 78 51 64 5 x 10 3.5
1620A 20 6,600 ct 158 ma. 4-8-16 64 89 78 51 62 5 x 10 3.5
1650FA 25 7,600 ct 128 ma. 4-8-16 64 89 78 51 62 5 x 10 4
1645A 30 5,000 ct 128 ma. 4-8-16-70V 64 95 78 51 68 5 x 10 4.5
1650G 35 6,600 ct 200 ma. 3.5/8/16/250/500 80 95 97 64 57 5 x 10 5
1650HA 40 6,600 ct 200 ma. 4-8-16 80 102 97 64 68 5 x 10 6.5
1650KA 50 3,400 ct 318 ma. 4-8-16 80 102 97 64 68 5 x 10 7
1650NA 60 4,300 ct 318 ma. 4-8-16 80 108 97 64 75 5 x 10 8
1650PA 60 6,600 ct 200 ma. 4-8-16 80 108 97 64 75 5 x 10 8
1650RA 100 5,000 ct 318 ma. 4-8-16 95 108 116 76 78 5 x 10 12
1650TA 120 1,900 ct 403 ma. 4-8-16 95 114 116 76 84 5 x 10 14
1650WA 280 1,900 ct 806 ma. 4-8-16 111 191 133 89 149 5 x 10 28

Suggested Tube Types

Part No. Audio Primary Operation Suggested Tube Types
Watts Impedance
(R.M.S.) (Ohms)
1608A 10 8,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1609A 10 10,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1615A 15 5,000 ct Push-Pull (2 Tubes) 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
1650E 15 8,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1620A 20 6,600 ct Push-Pull (2 Tubes) 6AQ5, 6L6, 6V6
1650FA 25 7,600 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34
1645A 30 5,000 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34
1650G 35 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34
1650HA 40 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34
1650KA 50 3,400 ct Push-Pull Par. (4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B
1650NA 60 4,300 ct Push-Pull Par. (2 or 4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650PA 60 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650RA 100 5,000 ct Push-Pull Par. (2 or 4 Tubes) 807, 5881, EL34, 6146B, 6550B, KT88
1650TA 120 1,900 ct Push-Pull Par. (4 or 6 Tubes) 6L6GC, 5881, EL34, 6550B, KT88
1650WA 280 1,900 ct Push-Pull Par. (6 or 8 Tubes) 6L6GC, 5881, EL34, 6550B, KT88
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 (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc.) will change optimum plate to 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.
 
 

Tube Output (10 - 280 Watts) 1608-1650 Series

Features

  • Please see our NEW & improved versions (easy wire secondary series).
  • Designed for push-pull tube output circuits.
  • Enclosed (shielded), 4 slot, above chassis Type "X" mounting.
  • Frequency response 30 Hz. to 30 Khz. at full rated power (+/- 1 db max. - ref. 1 Khz) minimum.
  • Insulated flexible leads 8" min.
  • Manufactured with plastic coil forms for coil support and insulation.
  • Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output.
  • Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications (see hook-up diagrams below).
  • For the "ultimate" in Push-Pull output see our line of epoxy potted output transformers.

1645 Only

  • Secondary Connections (Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications)
  • To hook up 4/8/16 ohm secondary loads - see schematic (do not use the white wire).
  • To hook up secondary to 70V loads, jumper Blk/Yel wire to Grn wire. Connect load to Blk and White wires.

 

Transformers (PDF here)

Part No. Audio Primary Maximum Secondary Dimensions Weight
Watts Impedance DC Impedance A B C D E G
(RMS) (Ohms) Per Side (Ohms) +/- 1/16" Slot (lbs.)
1608 10 8,000 ct 100 ma. 4-8-16 64 70 78 51 43 5 x 10 2.5
1609 10 10,000 ct 100 ma. 4-8-16 64 70 78 51 43 5 x 10 2.5
1615 15 5,000 ct 100 ma. 4-8-16 64 83 78 51 56 5 x 10 3.25
1620 20 6,600 ct 158 ma. 4-8-16 64 89 78 51 62 5 x 10 3.5
1650F 25 7,600 ct 128 ma. 4-8-16 64 89 78 51 62 5 x 10 4
1645 30 5,000 ct 128 ma. 4-8-16-70V 64 95 78 51 68 5 x 10 4.5
1650H 40 6,600 ct 200 ma. 4-8-16 80 102 97 64 68 5 x 10 6.5
1650K 50 3,400 ct 318 ma. 4-8-16 80 102 97 64 68 5 x 10 7
1650M 60 1,400CT/800CT 318 ma. 4-8-16 80 106 97 64 75 5 x 0.38` 7.5
1650N 60 4,300 ct 318 ma. 4-8-16 80 108 97 64 75 5 x 10 8
1650P 60 6,600 ct 200 ma. 4-8-16 80 108 97 64 75 5 x 10 8
1650R 100 5,000 ct 318 ma. 4-8-16 95 108 116 76 78 5 x 10 12
1650T 120 1,900 ct 403 ma. 4-8-16 95 114 116 76 84 5 x 10 14
1650W 280 1,900 ct 806 ma. 4-8-16 111 191 133 89 149 5 x 10 28

Suggested Tube Types

Part No. Audio Primary Operation Suggested Tube Types
Watts Impedance
(R.M.S.) (Ohms)
1608 10 8,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1609 10 10,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83
1615 15 5,000 ct Push-Pull (2 Tubes) 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6
1620 20 6,600 ct Push-Pull (2 Tubes) 6AQ5, 6L6, 6V6
1650F 25 7,600 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34
1645 30 5,000 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34
1650H 40 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34
1650K 50 3,400 ct Push-Pull Par. (4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B
1650N 60 4,300 ct Push-Pull Par. (2 or 4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650P 60 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88
1650R 100 5,000 ct Push-Pull Par. (2 or 4 Tubes) 807, 5881, EL34, 6146B, 6550B, KT88
1650T 120 1,900 ct Push-Pull Par. (4 or 6 Tubes) 6L6GC, 5881, EL34, 6550B, KT88
1650W 280 1,900 ct Push-Pull Par. (6 or 8 Tubes) 6L6GC, 5881, EL34, 6550B, KT88
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 (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc.) will change optimum plate to 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.