Universal Push Pull Tube Output Transformers

Author: kevin M  Date Posted:3 November 2017 

Universal Push-Pull Tube Output Transformers

Replacement and project output transformers for valve amps

  • Push-pull output transformers from 3 W to 280 W for guitar amp and hi-fi builds.
  • Primary impedance, maximum DC bias, secondary taps and suggested tubes are listed for every part.
  • Click any part number to see price, stock and dimensions in our shop.

If you cannot find the item you wish to purchase on our website, email us at info@evatco.com.au.

125 SeriesHook-Up Data125H & 125J1608–1650W SeriesA SeriesP Series
No matching parts. Email info@evatco.com.au and we will help find one.

Universal Push-Pull Tube Output: 125A–125E

Compact universal units. Use the hook-up table below to wire the secondary lugs for your speaker impedance.

Part No. Audio Watts Max DC Bias Per Side (mA) Primary Inductance
125A 3 20 14.94 H
125B 5 35 8.97 H
125C 8 45 5.60 H
125D 10 55 4.48 H
125E 15 60 2.99 H

Hook-Up Data (125 Series)

Pick your voice coil impedance across the top and the secondary lugs down the side. Values are the total primary impedance in ohms, blue wire to brown wire.

Secondary lugs 1.5 Ω 2 Ω 3.2 Ω 4 Ω 6 Ω 8 Ω 12 Ω 15 Ω
1 & 2 27,000 – – – – – – –
2 & 3 18,000 24,000 – – – – – –
3 & 4 16,500 22,000 – – – – – –
4 & 5 10,000 13,500 21,600 27,000 – – – –
5 & 6 8,500 11,000 18,000 22,000 – – – –
1 & 3 5,400 7,200 11,500 15,000 21,600 – – –
2 & 4 4,200 5,600 9,000 11,200 16,800 22,500 – –
3 & 5 3,300 4,400 7,000 8,800 13,200 17,600 26,400 –
4 & 6 2,400 3,200 5,100 6,400 9,600 12,800 19,200 24,000
1 & 4 2,150 2,900 4,600 5,800 8,700 11,600 17,400 21,500
2 & 5 1,550 2,050 3,300 4,100 6,150 8,200 12,300 15,500
3 & 6 1,300 1,700 2,700 3,400 5,100 6,800 10,200 12,800
1 & 5 – 1,400 2,200 2,800 4,200 5,600 8,400 10,200
2 & 6 – – 1,700 2,100 3,150 4,200 6,300 8,000
1 & 6 – – 1,200 1,500 2,300 3,000 4,500 5,600

General Replacement 8 Watt Push-Pull: 125H & 125J

Part No. Audio Watts Primary Impedance (Ω) Secondary Impedance (Ω) Primary Inductance
125H 8 10K 2, 4 or 8 5.60 H
125J 8 2.5K or 4K 6/8 or 3.2/4 5.60 H

125J connections

Primary (plate to plate, brown to blue) Secondary (Ω) Use secondary leads
4,000 C.T. 6/8 White – Green
4,000 C.T. 3.2 / 4 White – Yellow
2,500 C.T. 6/8 Black – Green
2,500 C.T. 3.2 / 4 Black – Yellow

Push-Pull Output Transformers: 1608–1650W Series

Operation and suggested tube types are shown for each part. Parallel operation means two or more tube pairs share the load.

Part No. Audio Watts (RMS) Primary Impedance (Ω) Max DC Per Side Secondary Impedance (Ω) Operation Suggested Tube Types
1608 10 8,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56V66BQ5EL84SV83
1609 10 10,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56V66BQ5EL84SV83
1615 15 5,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 2A36A36AQ56B4G6L66V6
1620 20 6,600 C.T. 158 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56L66V6
1650F 25 7,600 C.T. 128 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC6V68075881EL34
1645 30 5,000 C.T. 128 mA 4 - 8 - 16 - 70V Push-Pull (2 tubes) 6L6GC6V68075881EL34
1650H 40 6,600 C.T. 200 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC8075881EL34
1650K 50 3,400 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (4 tubes) 6L6GC8075881EL346146B6550B
1650M 60 1,400 C.T. / 800 C.T. 318 mA 4 - 8 - 16 — —
1650N 60 4,300 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (2 or 4 tubes) 6L6GC8075881EL346146B6550BKT88
1650P 60 6,600 C.T. 200 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC8075881EL346146B6550BKT88
1650R 100 5,000 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (2 or 4 tubes) 8075881EL346146B6550BKT88
1650T 120 1,900 C.T. 403 mA 4 - 8 - 16 Push-Pull Parallel (4 or 6 tubes) 6L6GC5881EL346550BKT88
1650W 280 1,900 C.T. 806 mA 4 - 8 - 16 Push-Pull Parallel (6 or 8 tubes) 6L6GC5881EL346550BKT88

A Series: 1608A–1650WA

Updated versions of the series above with the same ratings, plus 1650E (15 W) and 1650G (35 W).

Part No. Audio Watts (RMS) Primary Impedance (Ω) Max DC Per Side Secondary Impedance (Ω) Operation Suggested Tube Types
1608A 10 8,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56V66BQ5EL84SV83
1609A 10 10,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56V66BQ5EL84SV83
1615A 15 5,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 2A36A36AQ56B4G6L66V6
1650E 15 8,000 C.T. 100 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56V66BQ5EL84SV83
1620A 20 6,600 C.T. 158 mA 4 - 8 - 16 Push-Pull (2 tubes) 6AQ56L66V6
1650FA 25 7,600 C.T. 128 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC6V68075881EL34
1645A 30 5,000 C.T. 128 mA 4 - 8 - 16 - 70V Push-Pull (2 tubes) 6L6GC6V68075881EL34
1650G 35 6,600 C.T. 200 mA 3.5 / 8 / 16 / 250 / 500 Push-Pull (2 tubes) 6L6GC8075881EL34
1650HA 40 6,600 C.T. 200 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC8075881EL34
1650KA 50 3,400 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (4 tubes) 6L6GC8075881EL346146B6550B
1650NA 60 4,300 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (2 or 4 tubes) 6L6GC8075881EL346146B6550BKT88
1650PA 60 6,600 C.T. 200 mA 4 - 8 - 16 Push-Pull (2 tubes) 6L6GC8075881EL346146B6550BKT88
1650RA 100 5,000 C.T. 318 mA 4 - 8 - 16 Push-Pull Parallel (2 or 4 tubes) 8075881EL346146B6550BKT88
1650TA 120 1,900 C.T. 403 mA 4 - 8 - 16 Push-Pull Parallel (4 or 6 tubes) 6L6GC5881EL346550BKT88
1650WA 280 1,900 C.T. 806 mA 4 - 8 - 16 Push-Pull Parallel (6 or 8 tubes) 6L6GC5881EL346550BKT88

P Series: 1650KP, 1650PP, 1650PAP & 1650RP

Part No. Audio Watts (RMS) Primary Impedance (Ω) Max DC Per Side Secondary Impedance (Ω) Operation Suggested Tube Types
1650KP 50 3,400 C.T. 318 mA 4 - 8 - 16 — 6L6GC8075881EL346146B6550B
1650PP 60 6,600 C.T. 200 mA 4 - 8 - 16 — 6L6GC8075881EL346146B6550BKT88
1650PAP 60 6,600 C.T. 200 mA 4 - 8 - 16 — —
1650RP 100 5,000 C.T. 317 mA 4 - 8 - 16 — 8075881EL346146B6550BKT88
Need dimensions, mounting details or help matching a transformer to your build? Search the part number in our shop or email info@evatco.com.au.