Back by popular demand: For sale are new ~10 ounce transformers with 2 1/2\" mounting centers, for $7 each. They are 70Vline matching transformers but perfect impedance for push pull 6V6GT and other tube amps. Please read below:

0 watt output transformers 8KCT to 4 or 8 ohms, great for tube amps etc.

PRIMARY: (at 8K CT impedance; plate to plate DC resistance about 230 DC ohms center tapped. The impedance from B+ to plate and B+ to plate is 1.5 henry, and 6 henry plate to plate).

Can use these for SE single ended amps also (i.e. 0K and 8K primary, and put 22-47 ohm in series with plate to give it an air gap type sound). (an air gap is a cut in single ended transformers to give a softer sound).

Common = 0K

0.625W = 8K primary impedance

1.25W = 4K primary impedance

2.5W = 2K primary impedance

5W = 1K primary impedance

10W = 500 ohm primary impedance

Push pull 6V6GT or push pull 6BQ5/EL84s are made for 8KCT. This also has outputs of common, 4 ohm, and 8 ohm.

(for 8KCT, use 2000 ohm to B+, Common to one plate, 8000 ohm to other plate)

For single ended, use common to B+, 4 or 8K to plate, etc.

SECONDARY: Common, 4 ohm, and 8 ohm speakers

Impedance=Volts^2/Watts example 70*70 / 0.625 = 7840. Tap marked 0.625W is about 8000 ohms or 8K impedance vs. common.

p=E^2/R example 70 volts on 500 ohm tap would be 70*70/500 =10 watts output

if there is 70 volts on the the 500 ohm tap, there would be 280 volts on 8K (0.625W)tap.

with 70V on 10W taps, the voltage on 8K tap is in the ball park of 250 volts.

If push pull amp produces 280 volts RMS from plate to plate (C and 0.625W taps),

output would be E^2/R = 280*280/7840 = 10 watts output

Note, if 70V was on common and 500 ohm, the 8K primary would be about 280V.

Due to their plastic insulation, we\'ve sold hundreds and never heard of arcing

with them run to 450 volts. If using for a headphone amp, always ground your output

to be safe. Current? We\'ve run them up to 40 ma each plate (80 ma total), or 50 ma single ended.

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For 8K primary, use the black, brown (CT), and purple wires (these measure ~230 DC ohms CT, and impedance from the brown CT to black (plate) or purple (plate) is 1.5 henry, or plate to plate impedance 6 henry.

We dont know the voltage rating, but have used these for push pull 6V6, push pull 6BQ5 amps.

Price is $7 each. The secondary is marked \"SEC C 4ohm and 8ohm). Please, no questions AFTER you buy. If you\'ve never built an amp or never thought about impedance transformers before, don\'t buy and ask a lot of questions as you buy your first amp. Ask any questions before you buy. These are new, being sold style=\"font-family: Arial;\">