Hi!
I recently aquiered an obviously Vintage OPT from a flee marked. It's probably been used in a radio. I have measured it to be of a 5K:8 ratio.
The windings have many paper-interleavings, and is impregnated in wax. It really looks like a (relative) quality opt. I think I want to use it in a SE guitar amplifier with a 6V6.
One interesting thing though, is that it apparently does not have an Airgap, I can see no paper-interleaving between the E and the I parts of the core.
So, was it normal to use Parafeed in the Radio days? How can I find out if the OPT can pass any DC current?
Thanks;
-stigla
I recently aquiered an obviously Vintage OPT from a flee marked. It's probably been used in a radio. I have measured it to be of a 5K:8 ratio.
The windings have many paper-interleavings, and is impregnated in wax. It really looks like a (relative) quality opt. I think I want to use it in a SE guitar amplifier with a 6V6.
One interesting thing though, is that it apparently does not have an Airgap, I can see no paper-interleaving between the E and the I parts of the core.
So, was it normal to use Parafeed in the Radio days? How can I find out if the OPT can pass any DC current?
Thanks;
-stigla
There are fancier ways to do it, but my inclination would be to rig it up with whatever small tube I had laying around (like an EL84), in triode for simplicity, then run a signal to the grid and see what comes out. If you've got a test bench with basic stuff like power supplies, sig generators, clip leads, and a scope, this should take less than an hour.
Doesn't have to have paper in the core, usually all the Es and Is are grouped together rather than interleaved as in an AC transformer. Maybe a piece of cardboard between the Es and Is to add a little gap but it's not necessary if the current is low, which may very well be on a 6V6 SE OPT.
Tim
Tim
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