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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Passive pre with autoformer and interstage - expertise wanted plz posted by SomeJoe on March 29, 2007 at 19:59:39:
Hey Joris,Of course it is legit. As for the load the sources see, you have to remember the "20K' load is reflected back by the turns ratio squared so as you attenuate the reflected load goes up. At low frequencies the inductance of the autoformer will dominate and for the most part when driving tubed stages without adding additional loading resistors the primary L will be the only number of interest since the reflected load will be at least a magnitude larger.
I personally do not like adding impedance numbers to magnetic devices that will not be terminated with the defined load. It is one thing to put a 5K number on an OT that will see an 8 ohm load, but for an IT where the load is usually not the defined value, it just serves to confuse the matter.
dave
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Follow Ups
- Re: Passive pre with autoformer and interstage - expertise wanted plz - dave slagle 14:01:59 04/01/07 (2)
- Re: Passive pre with autoformer and interstage - expertise wanted plz - SomeJoe 10:08:15 04/03/07 (1)
- Re: Passive pre with autoformer and interstage - expertise wanted plz - dave slagle 11:39:40 04/03/07 (0)
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