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Step Up Transformers inside the turntable?
Step Up Transformers inside the turntable?
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Old 18th May 2019, 10:56 PM   #1
cyto is offline cyto  United States
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Default Step Up Transformers inside the turntable?

I have a SUT I built with Cinemag 1254s and I decided to place them inside my phono preamp to get rid of a set of interconnects and just because I want to.. It is a modified Hagerman Cornet 2 with an external PSU.

I got to thinking that if I put the step ups in the turntable (a highly modified Technics 1200, RCA jacks, external PSU, carbon fiber tonearm) then the very low MC output signal would be travelling a minimal distance. Regardless of where I put them I will install a bypass switch in case I put a MM cart.

I have never heard of someone putting the step ups in a turntable but I cannot think of a reason why I can't. I have training and used to be an electronics tech.

What do you guys think?
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Old 18th May 2019, 11:07 PM   #2
vinylkid58 is offline vinylkid58  Canada
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Step Up Transformers inside the turntable?
Quote:
Originally Posted by cyto View Post
I have never heard of someone putting the step ups in a turntable but I cannot think of a reason why I can't. I have training and used to be an electronics tech.
Well, turntables have a motor, and won't the motor have an electrical field around it which could be a source of hum for a SUT?

And, some turntables just don't have a place to put them.

jeff
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Old 18th May 2019, 11:58 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by cyto View Post
if I put the step ups in the turntable (a highly modified Technics 1200, RCA jacks,
external PSU, carbon fiber tonearm) then the very low MC output signal would be
travelling a minimal distance.
Should work, especially if you use mu-metal to shield the SUT,
and keep it near the base of the tone arm.
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Old 19th May 2019, 12:00 AM   #4
billshurv is offline billshurv  United Kingdom
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Step Up Transformers inside the turntable?
Ortofon used to put the SUT in the headshell...
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Old 19th May 2019, 12:02 AM   #5
vinylkid58 is offline vinylkid58  Canada
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Step Up Transformers inside the turntable?
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Originally Posted by billshurv View Post
Ortofon used to put the SUT in the headshell...
Got a pic or a model number or something?

jeff
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Old 19th May 2019, 02:30 AM   #6
cyto is offline cyto  United States
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Quote:
Originally Posted by vinylkid58 View Post
Well, turntables have a motor, and won't the motor have an electrical field around it which could be a source of hum for a SUT?

And, some turntables just don't have a place to put them.

jeff
Good thought
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Old 19th May 2019, 05:17 AM   #7
davidsrsb is offline davidsrsb  Malaysia
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Typical LO MC impedance is close to most cable impedance, so long cables are do not cause any resonances. If you put the step up transformer in the turntable, all of the capacitance loading sensitivity reappears
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Old 19th May 2019, 08:05 AM   #8
billshurv is offline billshurv  United Kingdom
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Step Up Transformers inside the turntable?
Ortofon SPU-T
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File Type: jpg SPU-T.JPG (37.2 KB, 173 views)
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Old 19th May 2019, 09:56 AM   #9
jcarr is offline jcarr  United States
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Quote:
Originally Posted by davidsrsb View Post
Typical LO MC impedance is close to most cable impedance, so long cables are do not cause any resonances. If you put the step up transformer in the turntable, all of the capacitance loading sensitivity reappears
David is correct. Any capacitance present between the SUT and phono stage will be multiplied by the square of the SUT's primary-secondary coil turn ratio. If the SUT gain is 20dB, any capacitance present between the SUT and phono stage will be multiplied by 100; a gain of 26dB will result in a capacitance multiplication factor of 400.

While there are benefits to placing a headamp so that it is closer to the MC cartridge and therefore farther from the phono stage, the reverse is true for SUTs.
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Old 19th May 2019, 11:55 AM   #10
cyto is offline cyto  United States
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Thanks for the replies everyone, I will put them in the phono preamp.
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