ECC 385:1 [3100 Ohms] Webcor 67P086-1 EL84 to 8 Ohm Vintage Output Transformer OT Tested Tube Amp Audio 1958-1962

One (1) fully 1.00 kHz AC tested and guaranteed vintage tube amp output transformer. AC testing using an oscilloscope allows us to find and reject transformers with noisy outputs, which a simple resistance or continuity test will not reveal. Made in USA in 1958-1962 by ECC for Webcor. IEA date code may vary, since this is a bulk listing of the OEM specification. Please offer $2 extra if you'd like us to poke through inventory to select a certain manufacturer or year. Otherwise, we'll grab the first one on the shelf. A typical IEA code for this model is 5156221. Weighs 0 lbs 10 oz. Center-to-center bolt spacing is 60 mm, and height of casing is 42 mm. Quantity sometimes available - please enquire.
This transformer was originally used to connect a EL84 output tube to a 8 Ohm speaker.

Please see the image of an original schematic using this model, for one possible application!

Using a 10V_pp, 1.00 kHz input to the primary coil, we have verified these connections for this vintage transformer:

The turns ratio (pri:sec) is 20:1, leading to an impedance ratio for the main secondary coil of 385:1. This winding of the transformer would provide a 3100 ohm load resistance to the tube plate if you hook it to an 8 ohm speaker.

Rated at 3800 ohms into 8 ohms


SKU O-W086-1.