Reducing phono output level of tuner?
 

Hi group,

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.

Many thanks,

Patrick
--
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Reducing phono output level of tuner?
 

On Sun, 27 Aug 2006 19:10:08 GMT, Patrick Hogan
wrote:

Hi group,

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!
Are you using the phono inputs on the amp? If so, they are the wrong
inputs (in terms of gain and equalization) for a tuner. Which inputs
are you using?

Kal

Reducing phono output level of tuner?
 

Kalman Rubinson wrote:

Are you using the phono inputs on the amp? If so, they are the wrong
inputs (in terms of gain and equalization) for a tuner. Which inputs
are you using?

Kal


Yep, definitely the tuner input on the amp.

P
--
Reverse email components to reply

Reducing phono output level of tuner?
 

In article , Patrick Hogan
wrote:
Hi group,

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.

Can you solder? If it were me I'd fit a set of resistors to act as a
potential divider and so reduce the level that way. Ideally at the amp
input. If you are willing to do this, it would help if we knew the o/p
impedance of the tuner and the i/p impedance of the amp.

Alternatively, I think there are some companies who sell such potential
dividers, pre-fitted into a small connector which you insert into the
leads. An example:

www.rothwellaudioproducts.co.uk

However for the same sort of price you can buy a cheap metal-cased
switchbox from someone like Maplin and fit resistors internally, or a pot.
This means you won't have to modify the actual tuner or amp, but requires
some soldering. The advantage is that you can fiddle about with the level
until happy with it.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

Reducing phono output level of tuner?
 

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?
 

Dave Plowman (News) wrote:
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.

That'll do nicely - dual-gang pot, sockets and box have been purchased.
Thanks for the tip.

Patrick
--
Reverse email components to reply

Reducing phono output level of tuner?
 

On Mon, 28 Aug 2006 07:19:38 GMT, Patrick Hogan
wrote:

Kalman Rubinson wrote:

Are you using the phono inputs on the amp? If so, they are the wrong
inputs (in terms of gain and equalization) for a tuner. Which inputs
are you using?

Kal


Yep, definitely the tuner input on the amp.

Then you need an attenuator circuit, as Dave and Jim suggest.

Kal