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Old 19th January 2006, 04:50 PM   #1
yagas is offline yagas  Greece
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Talking Heretical Unity Gain line stage PLUS a little gain ?

SY, I would like to see another thread on how to couple a gain stage to your "Heretical line stage" using the same techniques...
although time is limited and valuable ...

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Old 19th January 2006, 05:35 PM   #2
SY is offline SY  United States
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It's very, very easy. Use a step-up transformer. A JT-11P-4 will give you about 3dB. The nice thing about the circuit setup is that you can optimize the load for nearly any transformer, so if you want more gain, just use a higher step-up. I did a quick trial with a Magnequest/Peerless 15095 and it worked very well, albeit with too much gain for me to reasonably use.
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Old 23rd January 2006, 10:31 AM   #3
yagas is offline yagas  Greece
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Sorry for my delayed response...

Agree ... but can my phono stage drive a 10K input transformer ?


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Old 23rd January 2006, 10:36 AM   #4
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Depends on the output voltage/impedance of your phono stage. Do you have any details?
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Old 23rd January 2006, 12:20 PM   #5
SY is offline SY  United States
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If it can't, it's not difficult to up the input impedance. What sort of phono stage are you using?
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Old 24th January 2006, 09:55 AM   #6
yagas is offline yagas  Greece
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I use the cornet phono from Hagerman.

http://www.hagtech.com/images/cornet2schem.gif

http://www.hagtech.com/cornet2.html

The output stage consists of 12AU7@175V@6mA
Output impedance is 1K
What about raising the output coupling cap to 8-9uf or to change the ccs to sink about 10 mA ?


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Old 24th January 2006, 11:35 AM   #7
SY is offline SY  United States
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You don't have to change anything, it will work fine as-is. 10K is not an unreasonable load for a 12AU7 cathode follower, and if you want a higher load impedance anyway, the input shunt resistor of the Heretical can be increased.
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Old 24th January 2006, 01:30 PM   #8
yagas is offline yagas  Greece
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Thank you
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