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Old 2nd February 2002, 09:10 PM   #1
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Question Leach amp as a integrated amp?

I have built Leach amp some months ago and it works incredible.
Now I thinking about using it as integrated amp( passive preamp + Leach power amp). I try this combination with simple plastic 100k pot, but it hasn`t got enough gain.

So I`m thinking about to increase gain (of the Leach amp) for about 6 dB (my CD player has a 2V rms output and tuner about 600 mV) to put maximum from amp.

It is possible to increase gain? I am worried about feedback network!!

Thank you for ideas!
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Old 3rd February 2002, 02:43 PM   #2
bawang is offline bawang  Malaysia
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Default More gain?

Why don't you insert a simple gain circuit before the power amp (ie a simple preamp)?
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Old 3rd February 2002, 04:33 PM   #3
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Yes I tried with some preamps, but sound is better (my opinion) with simple plastic pot. Also you got just one box and minumum number of components in signal trace.
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Old 4th February 2002, 08:13 PM   #4
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Default Preamp For Leach Amp

Dr. Leach published a preamp construction article and design "Construct a Wideband Pre-amp" in Audio magazine, sometime in the 1970's. I listened to it being played through a (my) Leach amp and was quite impressed.

Let me know if you find any of those "Gain Pots". Quite rare, I believe .
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