PUSH PULL OUTPUT TRANSFORMERS
Push-Pull Guitar Amp circuits utilize a pair or quad set of vacuum tubes to produce sweet, soulful music in a configuration that generally requires smaller transformer cores than a comparable wattage SE circuit. P-P Output Transformers are used used to match the impedence of a pair/quad of vacuum tubes to a speaker load. There is not the need to carry significant DC Currents that saturate the magnetic field in such a circuit so the laminated core structures are generally interleaved 1x1 to maximize coil inductance. More Inductance (Henries) generally translates to improved Bass frequency response. Low “leakage” losses from interleaved windings generally result in better treble response.
Guitar speakers typically have a usable frequency response of 82Hz to about 5Khz. In the design of these OT's I’ve reverse engineered some 18W to 22W output transformers I enjoy, then boosted the Inductance using high quality laminations and careful winding techniques to get low end output to "dropped D" range. If it sounds laborious to produce such a winding and core correctly, it is. This design is the culmination of 2 years of prototyping in my shop, amp proveouts and production approval sampling offshore to get the most bang for the hobbyist's buck. You may find you like it too....it's not $85, try one.
Push-Pull Output Transformers- Current Offering(s)
- OT5PP 0.5VA to 5VA Push-Pull OT 22K5: 4/8/16 Ohm shielded (China)
- OT15PP 7/8" Core 22VA Push-Pull OT 7K/8K : 4/8/16 Ohm, unshielded (Honduras)
- OT20PP 1" Core 22VA Push-Pull OT 6K6/8K : 4/8/16 Ohm, shielded (China)
- OT42PP 45VA Push-Pull OT 4K2 : 2/4/8/16 Ohm, Shielded (China)
See Sales and Information page for purchasing details
OVERVIEW: OT15PP & OT20PP*
*OT20PP is 8K/6K6 input impedence
The OT5PP will be acquiring shielded covers in the offshore version available late January
OT
xxxxxxxx
Unshielded OT15PP can also be mountedf in vertical bells
OT42PP- Now in stock
OT42PP Connections:
BLK: GRY 2 Ohm
BLK: GRN 4 Ohm
BLK: YEL 8 Ohm
BLK: ORG 16 Ohm
BRN-RED(CT)-BLU Push-Pull Inputs
WARNING!
IMPORTANT: High Voltage devices, such as these OutputTransformer's operate at lethal voltages and currents and are intended for use only by qualified Electronic Technicians, Tradespeople or Engineer's following sound safety practice.
| PART NUMBER | DESC | LIST |
| OT5PP | Desc: A small 5W max Push Pull OT. Now China made & fully shielded with offshore pricing. Input 22.5Kohm Competitive Xfmrs: | |
| OT15PP | 15W to 22W PP guitar amplifer circuits using EL84 or 6V6 pair power tubes into 8000/7000 Ohm inputs with 4,8 & 16 Ohm Outputs Un-shielded, slightly less iron than an OT20PP. This one can be mounted into end-bells with different powder coatings to match your project as an option.Circuits: Blues Jr, Marshall 18W, AC15, Princeton, Deluxe, Tweed Deluxe Competitive Xfmrs: | |
| OT20PP | 15W to 22W PP guitar amplifer circuits using EL84 or 6V6 pair power tubes into 8000/6600 Ohm inputs with 4,8 & 16 Ohm Outputs. It's basically an OT15PP with about 12% more iron. Use this if you are looking for a little more low-end response or want a true 6600Ohm impedance match.Circuits: Blues Jr, Marshall 18W, AC15, Princeton, Deluxe, Tweed Deluxe Competitive Xfmrs: Circuits: Blues Jr, Marshall 18W, AC15, Princeton, Deluxe, Tweed Deluxe | |
OT42PP | Up to 45W PP guitar amplifer circuits using 6L6 pair power tubes into 4200Ohm inputs with 2,4,8 & 16 Ohm Outputs Also usable 8400 Ohms to 4, 8,16,32 Ohms output Competitive Xfmrs: Circuits: Bandmaster, Tremolux, VibroVerb, Vibrolux, New China version Sept 2011has shielded case and a 2 ohm tap. | New
|