Turns Ratio of Super Reverb Output Transformer

[rnbboy@comcast.net]

Can someone please tell me what the turns ratio of my output transformer is on my Super Reverb.
I know the secondary is 2 Ohms but what is the primary impedance? Also Looking for the voltage
gain of a 6L6 pentode. Thanks in advance for any and all replies.

[JoeM]

Super Reverb OT primary 4k.

Data sheet for 6L6GC:

http://www.mif.pg.gda.pl/homepages/f...93/6/6L6GC.pdf

[Old Tele man]

...the earlier, Leo Fender-era, Super Reverbs used an OT with 4.2K-ohm primary and 2-ohm output (4.2K:2-ohm). Not sure what FMIC is using these days, but most of the "universal" replacements are 4.0K:2-ohm...closer to the "optimum" 3.8K-ohm that 6L6's like to see, but not same as the originals.

...so, the answer to your original question about "turns-ratio" (TR = Np/Ns) would be:

TR = (Np/Ns) = SQRT[ Zp/Zs ]

TR = (Np/Ns) = SQRT[ 4,200/2 ] = 45.8:1, slightly lower for current 4K:2 OT's

[Chuck H]

In case the OP doesn't know how to read math formula nomenclature (as I don't. Shameful, I know) or doesn't know all the electronics nomenclature (uh)...

You can place a small AC voltage on the secondary and read the result on the primary. In OTM's example above, if you measure 1VAC going into the secondary you should read 45.8VAC on the primary. The turns ratio will be the primary voltage read divided by the secondary input voltage. Easy peezy. The inductance of the transformer could load very weak signals and give a slightly inaccurate reading. You do need to take a voltage read of what your putting into the secondary with the unit under test. That is, just because your signal is 1V you can't assume that with the unit under test the signal is still 1V. It can load down. So read the VAC your putting into the secondary with the unit under test. Some guys use an AC wall wart transformer for this sort of thing.