by Patrick Turner <info@[EMAIL PROTECTED]
>
May 2, 2008 at 09:14 AM
RealInfo wrote:
>
> Hi all
>
> I want to build a active speaker with built in tube amp in each .
>
> How do I prevent microphony `?
Answer:- Do not build the tube amps into the speaker if you want
to avoid microphony.
>
> Will it help if only the preamp will be small signal tubes base like
ecc83
> and the power will be solid stae ?
Guitar combo style tube amps with high gain 12AX7 and all other tubes
within the
combo box make sound coloured by the accoustic FB caused by the
vibrations.
Guys try to use non microphonic 12AX7.
Its the small tubes operating with high gain
at low levels which are most prone to microphony.
But for hi-fi, keep all tube amps well away from any vibrations.
>
> By the way the speaker is intended for keabords usage .
Some guys use a head amp for their guitar amp, with speakers set up in a
separate box some distance away
which seems to me a better way to do things.
Ditto for any other musical instrument, including keyboards.
Patrick Turner.
>
> Many thanks in advance
>
> EC
