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  #1  
Old 21st June 2016, 02:40 PM
bob orbell bob orbell is offline
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Default WD SUT's

Hi all, I am still not completely happy with my SUT's from when Peter C was in charge, so I have done a few tests of my transformers and a Pickering step up amp. there are a few pictures, so follow the posts. Picture 0001 is direct connection from generator to scope, 0002 is the same but in auto mode.
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File Type: bmp DS0001.BMP (13.4 KB, 47 views)
File Type: bmp DS0002.BMP (14.3 KB, 22 views)
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  #2  
Old 21st June 2016, 02:44 PM
bob orbell bob orbell is offline
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Default Re: WD SUT's

Picture 0003 is one transformer, at 1000Hz, picture 0004 is at 10000Hz.
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File Type: bmp DS0003.BMP (14.1 KB, 24 views)
File Type: bmp DS0004.BMP (14.2 KB, 19 views)
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  #3  
Old 21st June 2016, 02:45 PM
bob orbell bob orbell is offline
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Default Re: WD SUT's

Picture 0005 is at 20000Hz, and 0006 is at 50000Hz.
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File Type: bmp DS0005.BMP (13.9 KB, 23 views)
File Type: bmp DS0006.BMP (14.3 KB, 15 views)
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  #4  
Old 21st June 2016, 02:49 PM
bob orbell bob orbell is offline
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Default Re: WD SUT's

Picture 0007 to 0010 are the SS Pickering, and as can be seen, the wave form is very little altered, compared to the transformers.
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File Type: bmp DS0007.BMP (13.5 KB, 7 views)
File Type: bmp DS0008.BMP (13.4 KB, 6 views)
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  #5  
Old 21st June 2016, 02:51 PM
bob orbell bob orbell is offline
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Default Re: WD SUT's

The sound of the Pickering is very very nice, why is the transformer distorting the signal?, any thoughts anyone. BOB
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File Type: bmp DS0009.BMP (13.2 KB, 7 views)
File Type: bmp DS0010.BMP (13.5 KB, 9 views)
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  #6  
Old 21st June 2016, 04:15 PM
Richard Richard is offline
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Default Re: WD SUT's

Hi Bob, they look good to me and the distortions are just limitations of bandwidth and phase shift which you'll find on TX coupled gear at high and low frequencies. When/if you set up Phono3S adjustable capacitors you'd use 1KHz SW and tweak for the cleanest corner. Pic 03 shows a little LF phase shift at 1KHz, 04 looks good for 10KHz, 05 shows a little HF roll off at 20KHz and 06 shows more HF roll off at 50KHz. Hopefully John will add/amend my thoughts. Did you check at lower F ?
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