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In Reply to: RE: Resistor on the interstage transformer posted by danlaudionut on August 23, 2015 at 09:31:55
I didn't forget all these things you say but maybe other manufactures did....
The example transformer you see above has very high frequency response so don't worry about those capacities and leakages. Copper resitance is low, about 50 Ohm primair and 50 Ohm secondairy. For lower core loss i used an amouphous c-core.
An 1:1 interstage is very easy to make, output transformers are different.
Follow Ups:
But anyone will tell you the test of a good interstage
is when there is no resistive load on the secondary.
IMO They sound much better that way too.
Without the resistive load,
how is the HF response?
That is when you need the proper tube
for the interstage.
THAT is what the 2K, 5K or 10K spec
is there for.
For the proper tube for the interstage
or vice versa.
DanL
For me the sound is also better if unloaded. If you have a good interstage there will be no overshoot or ringing.
I did make a lot of interstagesand i have no such problems.
Yes, the sound is definitely more open without padding resistors. There is also more magic when the IT can handle the driver tube's DC in the primary...
For splitting phase in push-pull applications, gain and impedance matching while sometimes lessening the number of needed gain stages, ITs are hard to beat. As the finest push-pull phase inverter, my namesake has indeed brought me closer to the real music...
So, sv572-10, you have built many excellent ITs ? Could you build me some 1:1s to match 245s to PP 245s that can handle 40 mA in the primary ? How about matching a 210 to 210s in PP with a bit less DC in the primary ? I could trade you tubes or $$...Best Regards....
I sended you a pm.
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