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Old 4th October 2012, 11:20 AM   #2231
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naah

'ts well known who's in charge for that

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Old 4th October 2012, 11:43 AM   #2232
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Quote:
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nope

just resistor across secondary,creating constant load

same as you walking with or without sack of cement on your shoulder(s)

or constant felt brake under EMT927/930 platter





loading secondary will decrease amplitude

so , speaking of directly altering modulation of gate , not influencing xconductance shape , as with ZAP
I used the word gain and that was wrong as i did not mean gain of the output stage but of the transformer, which would have amplification of less than 1.
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Old 4th October 2012, 11:51 AM   #2233
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exactement

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Old 4th October 2012, 11:56 AM   #2234
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Almost.
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Old 4th October 2012, 02:48 PM   #2235
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I have tried that. I still cannot see a significant difference. I am trying to understand the physical mechanism that secondary loading has w.r.t. distortion.

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load/unload two secs differently
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Old 4th October 2012, 02:59 PM   #2236
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Pa is talking about different gains for upper and lower halves , resulting in different THD spectra
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Old 4th October 2012, 05:40 PM   #2237
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Here are actual measurements of the circuit shown in #2213 with a variety of adjustments to the Zen pots P3 and P4. The "spare" primary winding is modulated at 0.8*Vout.
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Old 4th October 2012, 06:17 PM   #2238
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Which do you like best?
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Old 4th October 2012, 07:10 PM   #2239
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I haven't listened yet. I am now modifying the 2nd channel to match.

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Old 4th October 2012, 08:12 PM   #2240
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I experimented with adjustments to the other PCB which still has the primary windings in parallel. For Gain other than 2.0, I could not obtain distortion spectra comparable to those in post #2237 which has the "spare" primary winding modulated by 0.8*Vout.

If anyone is interested, I can offer an explanation for why the modulation is optimal at (Gain-1)/Gain*Vout.
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