anyone preamp ,tried this???

sagarverma · 27th October 2005, 08:46 AM

http://www.redcircuits.com/Page60.htm

anyone tried this preamp???is it really high quality??

plz tell me how it works

suggest improvements

is tl072 fine??

how to alter its gain?its at 4 and want to get it to 2.

there is another preamp using discrete components on http://www.redcircuits.com

is it really high quality?????

which one should i go for?

i/p from sony discman.

thanks in advance

Jay · 28th October 2005, 09:49 AM

Hi there,

"High quality" is relative. But in the audiophile term, such pre is not hi-end at all. Anyone hang around this site for more than a year won't build such preamp IMO.

Try this site: http://sound.westhost.com (or search by that words) you will find very valuable projects as well as information/theories. There is a project for preamp, along with useful information to answer your question. Rod Elliot's products quality is above average IMHO.

Or may be you want to try Nelson Pass' Bride Of Zen (BOZ/BOSOZ). They are my favourite SS preamp so far.

sagarverma · 28th October 2005, 10:17 AM

thanks for reply

i want to build a preamp with perfect faithful gain of two so the quality is not sacrificed.r the distortion figures mentioned for it sufficent for good quality.

i know bout Mr Elliot's site.but he uses too many components that make pcb cad painful(it took a month for 12b xover lr)

boz sounds interesting.

i have made pcb for the pamp in ques,(bec reply came in too late from anyone)

will post results soon.

DcibeL · 28th October 2005, 04:19 PM

I am no expert on what makes an ideal preamp, but I do know the TL072 is a very very cheap op-amp. To make the circuit better use a high quality op-amp, and make sure that C4 and C5 are high quality caps(polypropelyne, polyester, etc.). I am also curious on why it had been designed to use a single supply. IMO a preamp designed to use a + and - supply would be a better choice.

A design I think you should look at is Russ White's FreeBird. It is very simple and very effective. It uses expensive op-amps but I'm sure they can be exchanged with something else if you are on a budget.

Christer · 28th October 2005, 04:22 PM

Quote:

Originally posted by DcibeL
I am no expert on what makes an ideal preamp, but I do know the TL072 is a very very cheap op-amp. To make the circuit better use a high quality op-amp,

And yet there is at least one award-winning and not exactly cheap commercial preamp that uses those op amps everywhere. Audio is fun, isn't it?

sagarverma · 29th October 2005, 04:24 AM

well i have constructed this pamp.

****tl072 is a nice chip,good figures for the price****

its working good but has hmmmmm prob.maybe bec of caps u advising to change.will replace by philips ones.

strangely its working!!i never expexted it to work given single pwr supply.performance is good but far from what i want.

looking at rod's pamp.anyone done it.advise plz.

Jay · 31st October 2005, 03:20 AM

Quote:

Originally posted by sagarverma
performance is good but far from what i want.
looking at rod's pamp.anyone done it.advise plz.

To shorten your journey, bypass the opamp thing and find the discrete one.

sagarverma · 31st October 2005, 02:57 PM

done rods car preamp with ae

very good performance.works great.

my music i/p is from sony discman.a very peculiar thing happens at high volume,the bass dissappears at high volume from the discmans o/p

advise req on how to have a low freq gain so bass is high throughout the spectrum.

can the preamp b modified such that low freq has gain?preamp in this case is esp's car preamp with ae.

or do i need some other ckt.plz advise on requisite ckt.

27th October 2005, 08:46 AM	#1
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	anyone preamp ,tried this??? http://www.redcircuits.com/Page60.htm anyone tried this preamp???is it really high quality?? plz tell me how it works suggest improvements is tl072 fine?? how to alter its gain?its at 4 and want to get it to 2. there is another preamp using discrete components on http://www.redcircuits.com is it really high quality????? which one should i go for? i/p from sony discman. thanks in advance

28th October 2005, 04:19 PM	#4
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	I am no expert on what makes an ideal preamp, but I do know the TL072 is a very very cheap op-amp. To make the circuit better use a high quality op-amp, and make sure that C4 and C5 are high quality caps(polypropelyne, polyester, etc.). I am also curious on why it had been designed to use a single supply. IMO a preamp designed to use a + and - supply would be a better choice. A design I think you should look at is Russ White's FreeBird. It is very simple and very effective. It uses expensive op-amps but I'm sure they can be exchanged with something else if you are on a budget. __________________ The power of Science compels you!

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28th October 2005, 09:49 AM	#2
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Hi there, "High quality" is relative. But in the audiophile term, such pre is not hi-end at all. Anyone hang around this site for more than a year won't build such preamp IMO. Try this site: http://sound.westhost.com (or search by that words) you will find very valuable projects as well as information/theories. There is a project for preamp, along with useful information to answer your question. Rod Elliot's products quality is above average IMHO. Or may be you want to try Nelson Pass' Bride Of Zen (BOZ/BOSOZ). They are my favourite SS preamp so far.

28th October 2005, 10:17 AM	#3
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	thanks for reply i want to build a preamp with perfect faithful gain of two so the quality is not sacrificed.r the distortion figures mentioned for it sufficent for good quality. i know bout Mr Elliot's site.but he uses too many components that make pcb cad painful(it took a month for 12b xover lr) boz sounds interesting. i have made pcb for the pamp in ques,(bec reply came in too late from anyone) will post results soon.

29th October 2005, 04:24 AM	#6
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	well i have constructed this pamp. **tl072 is a nice chip,good figures for the price** its working good but has hmmmmm prob.maybe bec of caps u advising to change.will replace by philips ones. strangely its working!!i never expexted it to work given single pwr supply.performance is good but far from what i want. looking at rod's pamp.anyone done it.advise plz.

31st October 2005, 02:57 PM	#8
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	done rods car preamp with ae very good performance.works great. my music i/p is from sony discman.a very peculiar thing happens at high volume,the bass dissappears at high volume from the discmans o/p advise req on how to have a low freq gain so bass is high throughout the spectrum. can the preamp b modified such that low freq has gain?preamp in this case is esp's car preamp with ae. or do i need some other ckt.plz advise on requisite ckt.

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