Hammond 1750U 100W JMP/JCM 800 Output Transformer, 4/8/16 Ohm
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Create Free Business AccountKey Features
- Drop-in replacement for Marshall JMP and JCM 800 100 W units (P-TM0100; similar to C2668)
- 1,700 ohm C.T. primary with 4, 8 and 16 ohm secondary taps
- 100 W push-pull rating, bobbin wound
- Frequency response 50 Hz - 12 kHz (0/-1 dB); distortion under 1% at 70 Hz
- Open style with 11 in minimum leads
- 2160 VRMS dielectric strength; RoHS and REACH compliant
The 1750U is a 100 watt push-pull output transformer for tube guitar amplifiers, designed as a drop-in replacement for original units such as those in the Marshall JMP and JCM 800 (P-TM0100). The series table also lists it as similar to C2668. Model names are for reference only, and the manufacturer states it is not affiliated with the amplifier companies.
It provides a 1,700 ohm centre-tapped primary (blue and red with a white centre tap) and 4 ohm (orange), 8 ohm (yellow) and 16 ohm (green) secondary taps from a violet common. Typical DC resistance is 15.36 ohms blue-white and 16.56 ohms white-red on the primary and 0.320 ohm violet-green on the secondary.
At 1.0 kHz, 1.0 V open circuit, the blue-red primary measures 8.85 H (61.5K ohm); the secondaries read 22.59 mH (212.60 ohm) violet-orange, 47.54 mH (424.80 ohm) violet-yellow and 88.86 mH (757.20 ohm) violet-green. Primary leakage inductance is 7.97 mH. Frequency response is 50 Hz to 12 kHz (0/-1 dB reference @ 1 kHz), with distortion under 1% at 70 Hz.
The bobbin-wound, open-style unit has 11 in minimum leads. Drawing dimensions are A 3.750 in, B 3.936 in, C 4.600 in max, D 3.280 in and E 2.813 in, with G 0.203 x 0.375 in. Ratings are 2160 VRMS and -40 to 105 degC. It is RoHS and REACH compliant and ships at 8 lbs (3.63 kg).
Ideal For
- Marshall JMP 100 W output transformer replacement
- Marshall JCM 800 100 W repair
- 100 W push-pull tube amp builds
- 4, 8 or 16 ohm speaker cabinet matching
Overview
| Output Power | 100 W |
| Product Type | Tube guitar amplifier output transformer |
| Amplifier Type | Push-Pull |
| Original Amp Mfr | Marshall |
Dimensions
| Dimension A | 3.750 in ±0.063 |
| Dimension B | 3.936 in ±0.125 |
| Dimension C | 4.600 in max |
| Dimension D | 3.280 in ±0.063 |
| Dimension E | 2.813 in ±0.063 |
| Dimension G | 0.203 in x 0.375 in ±0.015 |
Electrical
| Distortion | Less than 1% @ 70 Hz |
| Test Reference | All graphs input level 27dBu @ 1.0 kHz reference |
| Tolerance Note | Results are typical and subject to normal manufacturing and electrical tolerances |
| Primary Impedance | 1,700 ohms C.T. |
| Temperature Range | -40 to 105 degC |
| Frequency Response | 50 Hz - 12 kHz (0/-1 dB reference @ 1 kHz) |
| Dielectric Strength | 2160 VRMS |
| Secondary Impedance | 4, 8, 16 ohms |
| DCR Primary White-Red | 16.56 ohms |
| DCR Primary Blue-White | 15.36 ohms |
| DCR Secondary Violet-Green | 0.320 ohm |
| Inductance Primary Blue-Red (@ 1.0 KHz, 1.0 V OC) | 8.85 H / 61.5K ohm impedance |
| Inductance Secondary Violet-Green (@ 1.0 KHz, 1.0 V OC) | 88.86 mH / 757.20 ohm impedance |
| Inductance Secondary Violet-Orange (@ 1.0 KHz, 1.0 V OC) | 22.59 mH / 212.60 ohm impedance |
| Inductance Secondary Violet-Yellow (@ 1.0 KHz, 1.0 V OC) | 47.54 mH / 424.80 ohm impedance |
| Leakage Inductance Primary Blue-Red (@ 1.0 KHz, 1.0 V SC) | 7.97 mH |
Identifiers
| UPC | 623980094212 |
| UNSPSC | 39121301 |
| Part Number | 1750U |
| Short Description | OUTPUT 100W JMP& JCM 800, EL34 |
Replacement Fitment
| Amp Model Name(s) (Ref. Only) | JMP, JCM 800 |
| Original Unit Reference (Drawing) | P-TM0100 |
| Similar To (MFG Part No.) (Series Table) | C2668 |
Packaging & Shipping
| Shipping Weight | 8 lbs (3.63 kg) |
Construction & Finish
| Style | Open style |
| Lead Length | 11 in minimum (all leads) |
| Winding Type | Bobbin |
| Primary Leads | Blue, White (C.T.), Red |
| Secondary Leads | Violet (common), Orange (4 ohms), Yellow (8 ohms), Green (16 ohms) |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Which Marshall amps is the 1750U for?▾
100 W JMP and JCM 800 units (original P-TM0100), with the series table listing it as similar to C2668. Model names are for reference only.
How does it differ from the 1750N?▾
The 1750N is a 50 W unit with a 3,200 ohm C.T. primary; the 1750U is rated 100 W with a 1,700 ohm C.T. primary. Both provide 4, 8 and 16 ohm taps.
What colour is the secondary common?▾
Violet; orange is 4 ohm, yellow 8 ohm and green 16 ohm.
What is the dielectric strength?▾
2160 VRMS.
How much does it weigh?▾
The shipping weight is 8 lbs (3.63 kg).
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