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Old 27th December 2013, 11:24 PM   #1
monaro is offline monaro  Australia
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Default Adding a pre out to amp

Hi guys,
I have a doosie of a question.
I have a kriesler 11 97 (here: http://www.kevinchant.com/uploads/7/...8231/11-97.pdf)
And I want to add a powered subwoofer to the preamp output (which it doesn't have!)
I was thinking of adding a connection at the volume pot but I can't get it to work when I connect it that channel stops working.
The amp does have high level input too but I find lack of bass using them - I think the tube amp filters out the low bass.
Any ideas? I'm not sure if maybe I need to add a resistor to the new rca connection so it doesn't cancel the channel although I'd have thought there would be bugger all signal drawn from the amp given its line level in?
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Old 28th December 2013, 05:57 AM   #2
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The output of the volume control should be the place but the impedances are so high you really want to add a buffer so that the cable capacitance doesn't affect the internal or external amp response. A cathode follower would do the trick. An FET source follower or a unity gain opamp would also be good.

G
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Old 28th December 2013, 07:10 AM   #3
monaro is offline monaro  Australia
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Join Date: Dec 2013
Oh thanks this is great advice. I understand that now - cathode following will stop the connection draining the whole signal. Question is what exactly do I buy and how do I connect it - i've never used one! Thanks!!
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