Hammond 1750T 30W Vox AC30 Reissue Output Transformer, 8/16 Ohm
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Create Free Business AccountKey Features
- Drop-in replacement for VOX AC30 Reissue output transformer (P-TVO30R)
- 4,000 ohm C.T. primary with 8 ohm and 16 ohm secondary taps
- 30 W push-pull rating, bobbin wound
- Open style with 21 in minimum leads
- Frequency response 70 Hz - 15 kHz (0/-1 dB); distortion under 1% at 70 Hz
- 2000 VRMS dielectric strength; RoHS and REACH compliant
The 1750T is a 30 watt push-pull output transformer for tube guitar amplifiers, designed as a drop-in replacement for original units such as the one in the VOX AC30 Reissue (P-TVO30R). Amp model names are listed for reference only, and the manufacturer states it is not affiliated with the amplifier companies.
It has a 4,000 ohm centre-tapped primary, with red and white outer leads and a brown centre tap, and 8 ohm (green) and 16 ohm (blue) secondary taps from a black common. Typical DC resistance is 54.00 ohms red-brown and 60.00 ohms brown-white on the primary, and 0.520 ohm black-blue on the secondary.
At 1.0 kHz, 1.0 V open circuit, the red-white primary measures 15.2 H (102K ohm), with secondary readings of 37.45 mH (336.1 ohm) black-green and 70.66 mH (604.2 ohm) black-blue. Primary leakage inductance is 4.61 mH. Frequency response is 70 Hz to 15 kHz (0/-1 dB reference @ 1 kHz) and distortion is under 1% at 70 Hz.
The bobbin-wound, open-style unit has especially long 21 in minimum leads for reaching the original connection points. Drawing dimensions are A 3.125 in, B 3.300 in, C 3.800 in, D 2.500 in and E 2.438 in, with G 0.188 x 0.406 in. Ratings are 2000 VRMS and -40 to 105 degC. It is RoHS and REACH compliant and ships at 4 lbs (1.81 kg).
Ideal For
- VOX AC30 Reissue output transformer replacement
- 30 W push-pull tube amp service
- 8 or 16 ohm speaker matching
- AC30-style amplifier builds
Overview
| Output Power | 30 W |
| Product Type | Tube guitar amplifier output transformer |
| Amplifier Type | Push-Pull |
| Original Amp Mfr | Vox |
Dimensions
| Dimension A | 3.125 in ±0.063 |
| Dimension B | 3.300 in ±0.125 |
| Dimension C | 3.800 in ±0.063 |
| Dimension D | 2.500 in ±0.063 |
| Dimension E | 2.438 in ±0.063 |
| Dimension G | 0.188 in x 0.406 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 | 4,000 ohms C.T. |
| Temperature Range | -40 to 105 degC |
| Frequency Response | 70 Hz - 15 kHz (0/-1 dB reference @ 1 kHz) |
| Dielectric Strength | 2000 VRMS |
| Secondary Impedance | 8, 16 ohms |
| DCR Primary Red-Brown | 54.00 ohms |
| DCR Primary Brown-White | 60.00 ohms |
| DCR Secondary Black-Blue | 0.520 ohm |
| Inductance Primary Red-White (@ 1.0 KHz, 1.0 V OC) | 15.2 H / 102K ohm impedance |
| Inductance Secondary Black-Blue (@ 1.0 KHz, 1.0 V OC) | 70.66 mH / 604.2 ohm impedance |
| Inductance Secondary Black-Green (@ 1.0 KHz, 1.0 V OC) | 37.45 mH / 336.1 ohm impedance |
| Leakage Inductance Primary Red-White (@ 1.0 KHz, 1.0 V SC) | 4.61 mH |
Identifiers
| UPC | 623980094311 |
| UNSPSC | 39121301 |
| Part Number | 1750T |
| Short Description | OUTPUT FOR AC30, RE ISSUE VOX |
Replacement Fitment
| Amp Model Name(s) (Ref. Only) | AC30 Reissue |
| Original Unit Reference (Drawing) | P-TVO30R |
Packaging & Shipping
| Shipping Weight | 4 lbs (1.81 kg) |
Construction & Finish
| Style | Open style |
| Lead Length | 21 in minimum (all leads) |
| Winding Type | Bobbin |
| Primary Leads | Red, Brown (C.T.), White |
| Secondary Leads | Black (common), Green (8 ohms), Blue (16 ohms) |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Which VOX amplifier is the 1750T for?▾
The AC30 Reissue (original unit P-TVO30R); model names are for reference only.
How does the 1750T differ from the 1750V?▾
Both are 4,000 ohm C.T., 8/16 ohm, 30 W units for the AC30; the 1750T is bobbin wound for the AC30 Reissue with 21 in leads, while the 1750V is paper wound for the AC30 Vintage with 12.0 in leads.
Which lead is the primary centre tap?▾
Brown, between the red and white primary leads.
How long are the leads?▾
21 in minimum.
What is the dielectric strength?▾
2000 VRMS.
