Hammond 1620 20W Push-Pull Tube Output Transformer, 6.6K CT
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Create Free Business AccountKey Features
- 20 W RMS audio, 6,600 ohm CT primary, 158 mA DC per side
- Secondary impedance 4/8/16 ohms
- Push-Pull (2 Tubes); suggested tubes 6AQ5, 6L6, 6V6
- 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, 9 in minimum; plastic coil forms
- Dielectric strength 2000Vrms; -40 to 105C temperature range
- Made in Canada; REACH and RoHS compliant
The 1620 is a 20 W push-pull tube output transformer with a 6,600 ohm centre-tapped primary, a higher 158 mA DC per side rating and 4, 8 and 16 ohm secondaries. It is suggested for two-tube push-pull stages using the 6AQ5, 6L6 or 6V6, and is a common step up for hi-fi and guitar amplifier projects in the 20 W class.
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 (9 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 212H / 93KOhm, leakage inductance of 9.20mH, a dielectric strength of 2000Vrms and a temperature range of -40 to 105C. Shipping weight is 4 lbs (1.81 kg).
The 1620 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
- Amplifier repair and restoration
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 6.6K OHM 20 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 ±0.063, 2.488 ±0.063 in |
| Weight (Spec Table) | 3.5 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) | 20 |
| 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 | 158 ma. |
| DCR Primary Red-Blue | 74.60 Ohms |
| Suggested Tube Types | 6AQ5, 6L6, 6V6 |
| DCR Primary Brown-Red | 65.40 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) | 6,600 ct |
| DCR Secondary Black-Green | 0.310 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 | 0.500 Ohm |
| Output Power (Typical, Drawing) | 20 Watts |
| Input Impedance (Typical, Drawing) | 6600 Ohms |
| Leakage Inductance @ 60Hz, 10.0V SC | 9.20mH (Primary Brown-Red) |
| Output Impedance (Typical, Drawing) | 4, 8 & 16 Ohms |
| Inductance | Impedance @ 60Hz, 10.0V OC | 212H | 93KOhm (Primary Brown-Red) |
Identifiers
| UPC | 623980300801 |
| UNSPSC | 39121301 |
| Part Number | 1620 |
Packaging & Shipping
| Shipping Weight | 4 lbs (1.81 kg) |
Construction & Finish
| Leads | Insulated flexible leads, 9" min. (part drawing); series sheet states 8" min. |
| 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 1620?▾
The primary is 6,600 ct ohms and the secondary offers 4-8-16 ohm taps.
Which tubes is it suggested for?▾
Suggested tube types are 6AQ5, 6L6, 6V6, 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 1620 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 1620 primary carry?▾
The maximum DC per side is 158 mA.
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