cheap or diy phono amp

[Guest]

Archived from groups: rec.audio.tech (More info?)

i have recently purchased a yamaha turntable in mint condition (it is
a late 80s-early 90s model). my dilemma is that i need a way to
amplify/change the output so i can use a standard aux-in on my home
receiver (which has no phono input)
thanks to any and all who have solved this problem. if there is a
cheap circuit i can build for under $20 i would be glad to take a look
at that as well!
robbie

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

>i have recently purchased a yamaha turntable in mint condition (it is
>a late 80s-early 90s model). my dilemma is that i need a way to
>amplify/change the output so i can use a standard aux-in on my home
>receiver (which has no phono input)
>thanks to any and all who have solved this problem. if there is a
>cheap circuit i can build for under $20 i would be glad to take a look
>at that as well!

http/www.paia.com/riaa.htm is close to your price range ($23.75).
If you have a well-stocked electronic junkbox you might be able to
build the equivalent for less.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the Jade Warrior home page: http/www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

On Sun, 19 Dec 2004 19:21:03 -0500, Robbie Wilson
<robbiewilsonnospamno@charter.net> wrote:

>i have recently purchased a yamaha turntable in mint condition (it is
>a late 80s-early 90s model). my dilemma is that i need a way to
>amplify/change the output so i can use a standard aux-in on my home
>receiver (which has no phono input)
>thanks to any and all who have solved this problem. if there is a
>cheap circuit i can build for under $20 i would be glad to take a look
>at that as well!
>robbie

Had the same problem. Found a neat little pre-amp
at *Radio Shack* with correct phono input. It has
various connections and two watts for speaker.
I use the headphone output to feed the computer --
works great. Only problem is that plugging into
the headphone jack cuts out the speaker. So I
monitor with cable from its Tape Out to my
stereo. About $25.

Mason C

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

For many years Shure had a unit that was the industry standard in
broadcast. It wasn't terribly expensive, is not a collectible, and
millions were made.

However many DIY projects are out there. If you want to avoid vacuum
tubes there are of course the cheesy little op amp circuits, but the
better solutions will use discrete FETs. You do not need an AP test set
to get RIAA right: you can use a good audio voltmeter and a sig gen. A
good scope in cal is probably the way to verify or characterize your
meter if you are not sure of its bandwidth, and if you are ambitious or
have a scope with cursors and autoset you can use it for the level
measurement itself (having to count graticules involves thinking, a
lost art these days.)

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

"DeserTBoB" <desertb@rglobal.net> wrote in message
news:3vfvs09pahksjle7lsftjsv8uq558p6lne@4ax.com...
> On Mon, 20 Dec 2004 20:13:23 GMT, Mason A. Clark
> <masoncNOT@THISix.netcom.comQQQ> wrote:
>
> >Had the same problem. Found a neat little pre-amp
> >at *Radio Shack* with correct phono input. <snip>
>
> You MUST be desperate to use a Rat Shack "phono preamp" for anything.
> RIAA EQ is as much as 3 dB off on those things. Surprisingly good on
> distortion, though, but noisy...60 dB s/n tops.

Max. 3 dB is not too bad. Some phono pre-amps are far worse, as are most
records.
S/N may be a worry too, but still better than most records.

It really depends on how good your records, turntable and cartridge are.

TonyP.

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

>For many years Shure had a unit that was the industry standard in
>broadcast. It wasn't terribly expensive, is not a collectible, and
>millions were made.



The M64.

I have one of those and just replaced the Electrolytic caps in it.
Pretty decent It also has tape head equalization and a flat preamp mode.

While researching preamps I found The Hagerman Bugle which is supposed to be
really fantastic.

It is sold as a Half Kit. They supply the PC board and the box which is nicely
detailed. You buy the parts from DigiKey
Richard H. Kuschel
"I canna change the law of physics."-----Scotty