In article ,
Patrick Hogan wrote:
I've just been given a nice Technics tuner, but it pumps out a very high
signal from its phono output - the amp only needs to be turned up to
about 10% for the volume to be too high. I know I'm going to be
listening to the CD player, with the amp at 25%, then switch over to the
tuner, and get blasted out of the room!
What is the best (actually simplest and cheapest) way to reduce the
output of the tuner? I'm OK about losing a tiny amount of quality if
necessary. I've had a look inside the tuner and there are no pots that
can be tweaked to reduce output.
You need what's called an attenuator between the CD and amp. Basically
resistors which will have no effect on quality. If you make up new phono
leads it's possible to incorporate the resistors in a plug. But to
calculate the resistor values you need to know by how much you intend
reducing the level by. A Goggle search will find free progs for doing this
calculation. The other, perhaps easier way, is to fit an inline pot so you
can set the attenuation to anything you want from max (zero output) to
none. You'll need a twin gang log pot of anywhere from 10-100k ohm. Cut
two phono leads in two and wire thus - only one channel shown.
(use a fixed font on your newsreader for ASCII 'art')
o-----------o
/
\
/
CD \----------o
/
\ Amp
/
Screen o-----------o-----------o
For posh, you could mount the pot in a small box. Maplin should sell the
bits, although they had a poor selection of twin gang *log* pots last time
I looked. You could use a linear one if you don't mind the 'law' (movement
for attenuation) not being the same as a normal volume control - or even
two single gang pots.
As regards buying ready made I *think* Canford Audio sell phono to phono
attenuators. A decent hi-fi shop might too.
--
*Ah, I see the f**k-up fairy has visited us again
Dave Plowman
London SW
To e-mail, change noise into sound.
Reducing phono output level of tuner?
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