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-   -   DIY AM/FM tuner tweak, is that possible? (http://www.diyaudio.com/forums/analogue-source/165799-diy-am-fm-tuner-tweak-possible.html)

ervinl 26th April 2010 07:44 AM

DIY AM/FM tuner tweak, is that possible?
 
Hi,

I am just curious is it possible to DIY AM/FM tuner and do some tweaking to get audiophile sound (means good sound and sensitivity), like in pre/power amplifier, e.g. change capacitor, resistor etc.

I do not think it is possible with active components, as usually it uses some chips for digital and analog one. Or is there still possibility (is there upgradeable ICs)?

Thanks,

Ervin L

Mooly 26th April 2010 08:42 AM

Depends on the equipment... does it use opamps in the output... old stuff may use 4558's etc. If it's years old may be worth replacing electroylitics, but ultimately the medium itself is a limiting factor.

You won't improve sensitivity, and I would stay clear of trying to alter anything in the RF/IF stages with the exception of electroylitics. Any parts in those stages that are bent over, misaligned physically etc... leave as they are as it will all have been aligned with them like that.

ervinl 27th April 2010 08:29 AM

I mean to tweak/upgrade new, FM/AM tuner kit found in the market. usually it just uses 1 IC or 2 from RF in up to stereo decoder. Only passive R and C outside the chip.

In audio, it is common to upgrade R and C to get better sound, but what about in RF?

I do not find yet information about this tweaking.

Mooly 27th April 2010 08:37 AM

Quote:

Originally Posted by ervinl (Post 2167478)
I mean to tweak/upgrade new, FM/AM tuner kit found in the market. usually it just uses 1 IC or 2 from RF in up to stereo decoder. Only passive R and C outside the chip.

In audio, it is common to upgrade R and C to get better sound, but what about in RF?

I do not find yet information about this tweaking.

Hi ervinl,
You might be better starting a new thread to ask that, as this one is about a specific problem on a Sony.

For what it's worth, I don't think it's advisable to go changing R's and C's in the RF stages of anything... you just run the risk of making things worse. The alignment will all have been done with exactly the parts that are fitted and taking into account the characteristics of those parts.
The only possible exception to that is any electroylitics that are years old and that may have dried out such as supply decoupling etc.

bocka 27th April 2010 01:29 PM

Quote:

Originally Posted by ervinl (Post 2167478)
I mean to tweak/upgrade new, FM/AM tuner kit found in the market. usually it just uses 1 IC or 2 from RF in up to stereo decoder. Only passive R and C outside the chip.

In audio, it is common to upgrade R and C to get better sound, but what about in RF?

In RF it's commonly known that you should avoid swapping components although they have the same values. If you don't have the measurement equipment you'll probably make things worse. You don't find any information about it as it's not diy.


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