Hammond 1615A 15W 5K Ohm CT Push-Pull Tube Output Transformer
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Create Free Business AccountKey Features
- 15 W RMS, 5,000 ohm CT primary, 100 mA max DC per side
- Suggested tubes: 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6 (2 tubes)
- Easy-wire secondary tapped at 4, 8 and 16 ohms
- 40% screen taps for Ultra-Linear operation
- Full-power response 30 Hz to 30 kHz, +/- 1 dB max.
- Enclosed shielded case, 4 slot Type "X" above chassis mount
The 1615A is a 15 watt (RMS) push-pull output transformer for hi-fi tube amplifiers built around a pair of output tubes. Its 5,000 ohm centre-tapped primary is rated for 100 mA DC per side, and the easy-wire secondary provides 4, 8 and 16 ohm taps.
The suggested tube list for this part is broad: 2A3, 6A3, 6AQ5, 6B4G, 6L6 and 6V6 in push-pull (2 tubes). That makes it a candidate for both triode designs and pentode or tetrode stages; its 40% screen taps support Ultra-Linear operation if desired. As the manufacturer notes, the tube operating conditions change the optimum plate-to-plate load, so check tube data before finalising.
Rated response is 30 Hz to 30 kHz at full rated power, +/- 1 dB max. (ref. 1 kHz). Typical drawing values are 181.8 ohms primary DCR, 7.5 H primary inductance at 1 kHz, 2000 Vrms dielectric strength and a -40 to 105 C temperature range.
The 1615A is housed in an enclosed (shielded) case with 4 slot, above chassis Type "X" mounting. Series table dimensions are A 2.50 in (64 mm), B 3.25 in (83 mm), C 3.06 in (78 mm), D 2.00 in (51 mm) and E 2.19 in (56 mm); the table lists 3.25 lbs and the shipping weight is 3.3 lbs. Plastic coil forms and insulated 8" minimum flexible leads complete the build. Made in Canada; RoHS and REACH compliant.
Ideal For
- Push-pull 2A3 or 6A3 triode amplifiers
- 6L6 or 6V6 push-pull hi-fi stages
- Ultra-Linear pentode output
- Tetrode connected audio output stages
Mounting
| Mounting Style | 4 slot, above chassis Type "X" mounting |
| Mounting Slot G | 0.20 in (5 mm) x 0.38 in (10 mm) |
Overview
| Series | 1608A-1650A Series, Tube Output (10 - 280 Watts) Easy Wire Secondary, Push-Pull HI-FI |
| Typical Applications | Push-pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output |
| Manufacturer Description | Output transformer, push-pull, 15W , primary 5,000 ct, 100 ma., secondary 4-8-16 |
| Manufacturer Short Description | AUDIO TX 5K OHM 15 WATT |
Dimensions
| Dimension A | 2.50 in (64 mm) |
| Dimension B | 3.25 in (83 mm) |
| Dimension C | 3.06 in (78 mm) |
| Dimension D | 2.00 in (51 mm) |
| Dimension E (+/- 1/16") | 2.19 in (56 mm) |
Electrical
| Operation | Push-Pull (2 Tubes) |
| Screen Taps | 40% screen taps for Ultra-Linear operation (if desired) |
| Audio Power (RMS) | 15 W |
| Primary Impedance | 5,000 ct ohms |
| Maximum DC Per Side | 100 ma. |
| Secondary Impedance | 4-8-16 ohms |
| Suggested Tube Types | 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6 |
| Rated Frequency Response | 30 Hz to 30 kHz at full rated power (+/- 1 dB max., ref. 1 kHz) minimum |
Identifiers
| UPC | 623980024240 |
| UNSPSC | 39121301 |
| Part Number | 1615A |
Packaging & Shipping
| Shipping Weight | 3.3 lbs (1.50 kg) |
| Unit Weight (Series Table) | 3.25 lbs |
Construction & Finish
| Leads | Insulated flexible leads, 8" min. |
| Enclosure | Enclosed (shielded) |
| Coil Forms | Plastic coil forms for coil support and insulation |
| Lead Colour Code | Primary: BLU (plate), BRN (plate), RED (B+), BLU/YEL and BRN/YEL (screen taps, 40% of primary volts); Secondary: BLK (COM), GRN (4 ohm), YEL (8 ohm), WHT (16 ohm) |
Environmental & Protection
| Temperature Range | -40 to 105 C |
| Dielectric Strength | 2000 Vrms |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
| Country Of Origin | Made in Canada |
Electrical (Typical, Drawing)
| Output Power | 15 W |
| Input Impedance | 5000 ohms |
| Output Impedance | 4/8/16 ohms |
| Primary DCR (Blue–Brown) | 181.8 ohms |
| Frequency Response (Typical) | Typ. 1.0 dB from 30 Hz to 30 kHz |
| Primary Inductance (Blue–Brown, @ 1.0 KHz, 1.0 V OC) | 7.5 H |
| Secondary Impedance (Black–Green, @ 1.0 KHz, 1.0 V OC) | 186.4 ohms |
| Secondary Impedance (Black–White, @ 1.0 KHz, 1.0 V OC) | 612.8 ohms |
| Secondary Impedance (Black–Yellow, @ 1.0 KHz, 1.0 V OC) | 356.3 ohms |
| Secondary Inductance (Black–Green, @ 1.0 KHz, 1.0 V OC) | 70.2 mH |
| Secondary Inductance (Black–White, @ 1.0 KHz, 1.0 V OC) | 210.4 mH |
| Secondary Inductance (Black–Yellow, @ 1.0 KHz, 1.0 V OC) | 125.9 mH |
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Frequently Asked Questions
Can the 1615A be used with 2A3 triodes?▾
Yes, 2A3 is among the suggested tube types, alongside 6A3, 6AQ5, 6B4G, 6L6 and 6V6, in push-pull (2 tubes).
What is the primary impedance and current rating?▾
5,000 ohms centre-tapped, with a maximum of 100 mA DC per side.
Which secondary taps are available?▾
4, 8 and 16 ohms, on the GRN, YEL and WHT leads respectively, with BLK as common.
Can this transformer be used for Ultra-Linear operation?▾
Yes. It includes 40% screen taps (BLU/YEL and BRN/YEL leads) for Ultra-Linear operation if desired.
How large is it?▾
A 2.50 in, B 3.25 in, C 3.06 in, D 2.00 in, E 2.19 in, with 0.20 x 0.38 in mounting slots.
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