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)
Desc: A small 5W max Push Pull OT. Built in small quantities in USA. I typically will keep a few pieces on hand. Competitive Xfmrs: ~10d, made in USA $29.00 Direct Discounts at volume 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 Competitive Xfmrs: $24.95 Direct 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 In Stock 25W to 40W PP guitar amplifer circuits using 6L6 pair or EL84/6V6 Quad power tubes into 4200/3300 Ohm inputs with 4,8 & 16 Ohm Outputs Competitive Xfmrs: In Stock $29.95 Direct Discounts at volume PART NUMBER DESC LIST OT5PP
Input 22.5Kohm
Outputs 4,8,16 Ohm outputs.
Inductance- 35H
Mounting 2.81" centers
Hammond 125A
Circuits: Intended use is something like the F^r^fly circuit,
1 to 5W push pull circuits
OT15PP
Fender125A108, 022913, 125A1A, 041318
Hammond 1750E, 1750H, P-T125E
Edcor XPP15
In Stock OT20PP
Fender125A108, 022913, 125A1A, 041318
Hammond 1750E, 1750H, P-T125E
Edcor XPP15$28.95 Direct OT40PP
Also usable 8400/6600 Ohms to 8,16,32 Ohms output
Fender 022848, 125A6A
Hammond 17501750J
Edcor CXPP25, CXPP50
See Sales and Information page for purchasing details
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OVERVIEW: OT15PP & OT20PP*
*OT20PP is 8K/6K6 input impedence
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OVERVIEW: OT40PP
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.