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Old 12th December 2008, 11:24 PM   #1
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Location: Albury NSW Australia
Default Please add to my confusion re stepup transformers

Hey Guys
I just bought an ortofon Rondo red.
Internal Impedance = 6 Ohms
recommended load impedance 10 - 200 Ohm.
Output Voltage 500 Micro Volts
I must admit to feeling a bit of a bonehead trying to wrap said head around which transformers to get (some say sowter 8055 then others say a different sowter 9750 low z etc)
Can anyone shed light on which sut they have used and also what else needs to be used... for instance a zobel network needs to be wired in on a sowter 8055.
I just have trouble understanding the ratios and which tranny i need etc etc
My phono stage is a c3g/6sl7 one with a 47k resistor across the input. I am willing to change that if needed (the resistor that is)
"Better to say nothing and keep them guessing than to speak and remove all doubt."
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Old 13th December 2008, 12:32 AM   #2
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Old 13th December 2008, 03:05 PM   #3
EC8010 is offline EC8010  United Kingdom
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The 8055 will work just fine with a 6R cartridge. Have a look at the Sowter site and it will tell you which Zobel network to use to optimise the transformer for that cartridge. The 1:10 step-up ratio will give you 5mV - a healthy signal. Almost all transformers need a Zobel network, it's just that they don't always know it. And yes, I use 8055.
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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Old 14th December 2008, 10:28 AM   #4
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Of what I read the Sowters are ok.. Although I wonder re the Lundahls.
Will let you know either way
Thanks again
"Better to say nothing and keep them guessing than to speak and remove all doubt."
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