MATCHING UP
HAMMOND OUTPUT AND POWER TRANSFORMERS


The Hammond transformer line contains a few natural pairs of devices, but most other pairings are less obvious. Based on the standardized data, we have developed a list of suggested units that work together. Some of these pairings tie into the projects from TUT3 (The Ultimate Tone vol. 3), which contains both schematics and layouts for each project. Every TUT3 amp can be built on a standard Hammond 10" x 17" x 3" chassis. The Champ and Herzog can be built on 8" x 12" x 3".

TUT3 PROJECTS USING HAMMOND TRANSFORMERS

Amp OT PT
Champ 125B /C /D /E 270X or 261C6 with solid-state rectifier
  125BSE /CSE /DSE /ESE 272X with 5Y3 rectifier
    229B230 plate + 229A12 heaters, add 229C10 if tube rectified
     
Bassman 1650K 272JX
     
Plexi 5100 1645 272JX
     
800 1645 272JX
     
Bulldog 1650K 272JX
     
AC30 1645 270HX
     
AC15 125E 270EX or 261M6
     
Portaflex 1650F 270FX
     
Portaflex 125E 261M6 budget version
     
SVT 1650W 717 plate + 167S6 heater + 272DX
     
Bassmaster 1650N 278X
     
Custom Special 1650T 278CX
     
GuitarMate 125E 270FX
     
Herzog 125C / CSE 261C6 or 261E6
    229B230 plate + 229A12 heaters
     
Chain 125E + 1650N 278X for amp depicted in figure 17-2
     
Laney 1645 272JX

 

MONO AMPLIFIERS

These sets use the output transformer only up to its rated output.

SE Single-ended amps

WRMS OT PT Tubes
3W 125A /ASE 269AX 6V6, EL84
5W 125B /BSE 269AX 6V6, EL84, 6L6
8W 125C /CSE 269GX 6L6, EL34
10W 125D /DSE 269GX 6L6, EL34
15W 125E /ESE 270DX KT88; 2x 6L6, EL34; 3x 6V6, EL84
25W 1627SE 274X 2x KT88; 3x 6L6GC, 6550; 4x 5881, EL34
  1628SE 270HX 811A; 2x KT88
  1629SE 272FX 811A; 2x KT88
  1640SE 270FX 2x KT88; 3x 6L6GC, 6550; 4x 5881, EL34
75W 1625SE 278CX + 167T6 3x 811A as two mono blocks

Push-pull amps

WRMS OT PT Tubes
3W 125A 261C6, 269AX 2x 12AU7
5W 125B 269AX 2x EL84, 6V6
8W 125C 269GX 2x EL84, 6V6
10W 125D 269GX 2x EL84, 6V6
  1608 269EX /GX 2x EL84, 6V6
  1609 269GX 2x EL84, 6V6
15W 125E 270DX 2x EL84, 6V6, 6L6
  1615 270CAX 2x 6L6
  1650E 270DX 2x 6V6, 6L6
20W 1620 270CAX 2x 6L6
25W 1650F 270EX 2x 6L6, EL34
30W 1639 273X /CX 2x 6L6, EL34
  1645 272FX 2x 6L6, EL34
35W 1650G 272FX 2x 6L6, EL34
40W 1650H 276X 2x 6L6, EL34
50W 1650K /KP 272JX 2x 6L6, EL34
60W 1650N 272JX 2x 6L6, EL34; 4x 6L6
  1650P /PP 278X 2x 6L6, EL34, 6550, KT88
100W 1650R 278CX 2x 6550, KT88
120W 1650T 278CX 4x 6L6, EL34, 6550, KT88
280W 1650W 711 plate + 167S6 6x 6550, KT88


STEREO AMPLIFIERS

Output transformers are used only up to their ratings.

SE Single-ended amps

WRMS OTx2 PT Tubes (per channel)
3W 125A /ASE 261E6 /G6, 269AX 6V6, EL84
5W 125B /BSE 261G6, 269AX 6V6, EL84, 6L6
8W 125C /CSE 261M6, 270DAX 6L6, EL34
10W 125D /DSE 270EX 6L6, EL34
15W 125E /ESE 270FX, 272FX KT88; 2x 6L6, EL34; 3x 6V6, EL84
25W 1627SE 274BX 2x KT88; 3x 6L6GC, 6550; 4x 5881, EL34
  1628SE 282X 811A; 2x KT88
  1629SE 272JX 811A; 2x KT88
  1640SE 272JX 2x KT88; 3x 6L6GC, 6550; 4x 5881, EL34
75W 1625SE 278CX + 167T6 3x 811A as two mono blocks

Stereo Push-pull amps (WRMS per channel)

WRMS OTx2 PT Tubes
3W 125A 269AX 2x 12AU7
5W 125B 269JX 2x EL84, 6V6
8W 125C 270DAX 2x EL84, 6V6
10W 125D 270EX 2x EL84, 6V6
  1608 261M6, 270DAX 2x EL84, 6V6
  1609 261M6, 270DAX 2x EL84, 6V6
15W 125E 270HX 2x EL84, 6V6, 6L6
  1615 270FX 2x 6L6
  1650E 270FX 2x 6V6, 6L6
20W 1620 270HX 2x 6L6
25W 1650F 272HX /JX 2x 6L6, EL34
30W 1639 274AX /BX 2x 6L6, EL34
  1645 272JX 2x 6L6, EL34
35W 1650G 272JX 2x 6L6, EL34
40W 1650H 276X x2 2x 6L6, EL34 dual mono blocks**
50W 1650K /KP 272JX x2 2x 6L6, EL34 dual mono blocks**
60W 1650N 272JX x2 2x 6L6, EL34; 4x 6L6 dual mono blocks**
  1650P /PP 278CX 2x 6L6, EL34, 6550, KT88
100W 1650R 278CX x2 2x 6550, KT88 dual mono blocks
120W 1650T 278CX x2 4x 6L6, EL34, 6550, KT88 dual mono blocks
280W 1650W 711 plate + 167S6 6x 6550, KT88 dual mono blocks
**278CX has sufficient VA for two channels but excessive voltage; regulation required

Extended operation for Musical Instrument Amplifiers

Output power is increased by sacrificing low frequency response.

WRMS OT PT Tubes
50W 1645 272JX 2x 6L6, EL34
80W 1650N 278X 2x 6L6, EL34, 6550
100W 1650N 278CX 2x 6550, KT88; 4x 6L6, EL34
160W 1650T 278CX 4x 6L6, EL34, 6550
200W 1650T 182M117 + 182L60 + heater 4x KT88
400W 1650W 722 + 167S12 4x SV572-160, 811A

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