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Old 28th August 2004, 03:50 PM   #1
nkg is offline nkg  Australia
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Default opt frequency response

As a newbie I've started making a leak stereo 60 . I made the circuitboard
similar to the way leak did and have managed to get a transformer company here in perth to wind the output transformers to the same specs as the originals except for the core which like a c section but with out the two halfs. I don' t have the power transformers yet they will be ready in a couple of weeks and was woundering if its possible to measure their frequency response as they are not connected. They should have a primary load impedance of 5600 ohms, anode to anode resistance of 102 ohms and screen taps @25%. I've got a cro and function generator , do Ineed more equipment? or is it not possible.If someone could help Iwould be most gratefull.
nkg
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Old 28th August 2004, 09:02 PM   #2
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Put the function generator across the entire primary winding (ground one anode, other to genny output, leave UL and CT taps unconnected) and scope the output. A resistor should be loading the output winding, but for best the value depends on the generator's Zo divided by the impedance ratio.

Tim
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Old 29th August 2004, 12:38 AM   #3
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If you use Tim's method, be sure to adjust the frequency generator to the same output impedance as the output tubes by inserting a series resistor, other wise the frequency response will be incorrect, with too low source impedance you will see better, (wider) frequency response than what you get in the real amplifier.

Regards Hans
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Old 29th August 2004, 06:31 AM   #4
nkg is offline nkg  Australia
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Thanks Tim and Hans
Nigel
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