Hammond 1650F 25W Push-Pull Tube Output Transformer, 7.6K CT
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Create Free Business AccountKey Features
- 25 W RMS audio, 7,600 ohm CT primary, 128 mA DC per side
- Secondary impedance 4/8/16 ohms
- Push-Pull (2 Tubes); suggested tubes 6L6GC, 6V6, 807, 5881, EL34
- Frequency response 30 Hz to 30 kHz at full rated power, +/- 1 db max
- Enclosed (shielded), 4 slot, above chassis Type "X" mounting
- Insulated flexible leads, 8 in minimum; plastic coil forms
- Dielectric strength 2000Vrms; -40 to 105C temperature range
- Made in Canada; REACH and RoHS compliant
The 1650F is a 25 W push-pull tube output transformer with a 7,600 ohm centre-tapped primary, 128 mA DC per side and 4, 8 and 16 ohm secondaries. It is suggested for two-tube push-pull output stages using the 6L6GC, 6V6, 807, 5881 or EL34, giving hi-fi and guitar amplifier builders a higher primary impedance than the other 25 to 30 W models.
Construction follows the classic series design: the transformer is enclosed (shielded), with 4 slot, above chassis Type "X" mounting, plastic coil forms for coil support and insulation, and insulated flexible leads (8 in minimum per the part drawing). Frequency response is 30 Hz to 30 kHz at full rated power, +/- 1 db max (ref. 1 kHz) minimum. Because of the unique interleaving of the windings, both secondary windings must be engaged to meet specifications.
Dimensions from the series table are A 2.50 in (64 mm), B 3.50 in (89 mm), C 3.06 in (78 mm), D 2.00 in (51 mm) and E 2.44 in (62 mm), with 0.20 x 0.38 in mounting slots. Typical electrical data from the drawing includes a primary inductance of 285H / 124KOhm, leakage inductance of 10.40mH, a dielectric strength of 2000Vrms and a temperature range of -40 to 105C. Shipping weight is 4 lbs (1.81 kg).
The 1650F label is marked Made in Canada, and the part is REACH and RoHS compliant. The manufacturer notes that tube operating conditions change the optimum plate-to-plate load, so consult a tube manual or data sheet before choosing an output transformer.
Ideal For
- Push-pull tube hi-fi amplifiers
- Guitar amplifier output stages
- Triode, ultra-linear pentode and tetrode output
Overview
| Series | 1608-1650 Series - Tube Output Transformer, Push-Pull Audio (10-280 W) |
| Product Type | Output transformer, push-pull (classic tube type, ultra-linear) |
| Short Description | AUDIO TX 7.6K OHM 25 WATT |
Dimensions
| Dimension A | 2.50 in (64 mm) |
| Dimension B | 3.50 in (89 mm) |
| Dimension C | 3.06 in (78 mm) |
| Dimension D | 2.00 in (51 mm) |
| Mounting Slot G | 0.20 in (5 mm) x 0.38 in (10 mm) |
| Drawing Dimensions | 2.500 ±0.063, 2.000 ±0.063, 3.060 ±0.063, 3.500 ±0.125, 2.488 ±0.063 in |
| Weight (Spec Table) | 4 lbs |
| Dimension E (+/- 1/16") | 2.44 in (62 mm) |
| Mounting Slot (Drawing) | Ø0.203 x 0.375 in |
Electrical
| Operation | Push-Pull (2 Tubes) |
| Test Conditions | All graphs input level 27dBu @ 1.0 kHz reference; results typical, subject to normal manufacturing and electrical tolerances |
| Audio Watts (RMS) | 25 |
| Frequency Response | 30 Hz to 30 kHz at full rated power (+/- 1 db max - ref. 1 kHz) minimum |
| Dielectric Strength | 2000Vrms |
| Maximum DC Per Side | 128 ma. |
| Suggested Tube Types | 6L6GC, 6V6, 807, 5881, EL34 |
| DCR Primary Brown-Blue | 210.0 Ohms |
| Measurement Instruments | dScope Series III Audio Analyzer; Wayne Kerr 3255B with 3265B Inductance Analyzer; HP 4192a LF Impedance Analyzer; Keithley 2010 DVM |
| Primary Impedance (Ohms) | 7,600 ct |
| DCR Secondary Black-Green | 0.220 Ohm |
| Secondary Connection Note | Both secondary windings must be engaged to meet specifications (unique interleaving of the windings) |
| Secondary Impedance (Ohms) | 4-8-16 |
| DCR Secondary Black/Yel-Yel | 0.270 Ohm |
| Output Power (Typical, Drawing) | 25 Watts |
| Input Impedance (Typical, Drawing) | 7600 Ohms |
| Leakage Inductance @ 60Hz, 10.0V SC | 10.40mH (Primary Brown-Red) |
| Output Impedance (Typical, Drawing) | 4, 8 & 16 Ohms |
| Inductance | Impedance @ 60Hz, 10.0V OC | 285H | 124KOhm (Primary Brown-Red) |
Identifiers
| UPC | 623980301501 |
| UNSPSC | 39121301 |
| Part Number | 1650F |
Packaging & Shipping
| Shipping Weight | 4 lbs (1.81 kg) |
Construction & Finish
| Leads | Insulated flexible leads, 8" min. (part drawing) |
| Mounting | 4 slot, above chassis Type "X" mounting |
| Enclosure | Enclosed (shielded) |
| Coil Forms | Plastic coil forms for coil support and insulation |
Environmental & Protection
| Temperature Range | -40 To 105C |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the primary and secondary impedances of the 1650F?▾
The primary is 7,600 ct ohms and the secondary offers 4-8-16 ohm taps.
Which tubes is it suggested for?▾
Suggested tube types are 6L6GC, 6V6, 807, 5881, EL34, in Push-Pull (2 Tubes) operation. The manufacturer advises consulting a tube manual or data sheet first, since operating conditions change the optimum plate-to-plate load.
Do I need to connect both secondary windings?▾
Yes. Due to the unique interleaving of the windings, both secondary windings must be engaged to meet specifications; see the hook-up diagrams.
How is the 1650F mounted?▾
It is enclosed with 4 slot, above chassis Type "X" mounting; the drawing shows Ø0.203 x 0.375 in slots.
How much DC can each side of the 1650F primary carry?▾
The maximum DC per side is 128 mA.
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