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Old 19th April 2012, 09:28 PM   #1131
Junie is offline Junie  Philippines
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A month ago I altered almost same what you did Martin except that my R9 changed to 2.2k, and input cap to a series of 10uF caps which give me 5uf in total. Still the best sounding amp i have at home.
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Old 19th April 2012, 10:47 PM   #1132
a.wayne is offline a.wayne  United States
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Thanks for the responses guys ....
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Old 20th April 2012, 10:34 AM   #1133
AndrewT is offline AndrewT  Scotland
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Yes,
changing the gain changes the stability margins.

Carlos' crude methodology is not applicable.

He never "designed" the amplifier in the "normal" manner and thus his gain adjustment falls into the same never "designed" category.

Another confirmation. Changing the gain will not only change the multiplication as the signal passes through the amplifier, it also changes the shape of the signal. That change of shape is heard as a change in the sound.
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regards Andrew T.
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Old 20th April 2012, 01:24 PM   #1134
a.wayne is offline a.wayne  United States
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What's your suggestion then Andrew ..?
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Old 20th April 2012, 01:27 PM   #1135
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Quote:
Originally Posted by Junie View Post
A month ago I altered almost same what you did Martin except that my R9 changed to 2.2k, and input cap to a series of 10uF caps which give me 5uf in total. Still the best sounding amp i have at home.
Junie, about the input cap, how did the sound changed? Did you alter any input resistor as well?

Thanks,
Martin.
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Old 20th April 2012, 01:54 PM   #1136
Junie is offline Junie  Philippines
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Only the input cap, input resistor same value...improvement in vocals is what i've noticed it's sounds more realistic this time unlike before it's sounds like inside the "DRUM". I don't have an equipments to do measurements but my ears can hear the changes :-).
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Old 20th April 2012, 02:01 PM   #1137
a.wayne is offline a.wayne  United States
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Why not take out the Input cap completely .. ....
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Old 20th April 2012, 02:04 PM   #1138
Junie is offline Junie  Philippines
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Oh i have another MkIII on progress, boards came from Patrick.

Click the image to open in full size.
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Old 20th April 2012, 02:06 PM   #1139
Junie is offline Junie  Philippines
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Quote:
Originally Posted by a.wayne View Post
Why not take out the Input cap completely .. ....
Wayne I'm using a passive attenuator.
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Old 20th April 2012, 02:25 PM   #1140
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Junie, can you share the type, or model of cap you used and you connected them?.

Are they bipolar or polar back-to-back?

Thanks,
Martin.
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