Phonograph preamp DIY - schematic suggestions?
- bipedal
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Phonograph preamp DIY - schematic suggestions?
Slightly off topic since not directly recording-related, but I'll throw it out there. Any suggested resources or tips are appreciated.
I recently acquired a mid-'80s phonograph. Works/sounds fine, but it's calling out for a simple preamp to boost the level going into the rest of my sound system.
Seems like a basic phono preamp ought to be rather easily to build, but I haven't found any schematics online...
- Jay
I recently acquired a mid-'80s phonograph. Works/sounds fine, but it's calling out for a simple preamp to boost the level going into the rest of my sound system.
Seems like a basic phono preamp ought to be rather easily to build, but I haven't found any schematics online...
- Jay
Here's the standard RCA version
http://www.tube-amp.de/6SL7-riaa/rca-manual.gif
Calls for a 7025 but I read somewhere that it specs out slightly better with 6SL7's. Worked great for me.
http://www.tube-amp.de/6SL7-riaa/rca-manual.gif
Calls for a 7025 but I read somewhere that it specs out slightly better with 6SL7's. Worked great for me.
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- moves faders with mind
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Try searching for "RIAA preamp schematic" and you'll turn things up.
Here are a few from sources that are pretty reliable:
http://sound.westhost.com/project06.htm
http://www.paia.com/riaa.asp
http://www.borbelyaudio.com/eb199320.asp
http://www.passdiy.com/preamps.htm
Here are a few from sources that are pretty reliable:
http://sound.westhost.com/project06.htm
http://www.paia.com/riaa.asp
http://www.borbelyaudio.com/eb199320.asp
http://www.passdiy.com/preamps.htm
- thesimulacre
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If you wanna get fancy with it I can break open my X-LPS and snap a hi-rez photo of the top & bottom for ya. You could do your own cheapo version and label it "The Behr-record Player Pre."
Make sure whatever design you choose has enough headroom to handle an-overly loud vinyl (eg won't clip it's own output).
Make sure whatever design you choose has enough headroom to handle an-overly loud vinyl (eg won't clip it's own output).
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- re-cappin' neve
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Re: Phonograph preamp DIY - schematic suggestions?
National Semiconductor and Analog Devices should have examples of RIAA preamps in data sheets or app notes.bipedal wrote:Slightly off topic since not directly recording-related, but I'll throw it out there. Any suggested resources or tips are appreciated.
I recently acquired a mid-'80s phonograph. Works/sounds fine, but it's calling out for a simple preamp to boost the level going into the rest of my sound system.
Seems like a basic phono preamp ought to be rather easily to build, but I haven't found any schematics online...
- Jay
-a
"On the internet, nobody can hear you mix a band."
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- steve albini likes it
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I just harvested a crapload of 6SN7's from an organ a friend of mine was throwing away. Would this be a good use for such a thing?A-Barr wrote:Here's the standard RCA version
http://www.tube-amp.de/6SL7-riaa/rca-manual.gif
Calls for a 7025 but I read somewhere that it specs out slightly better with 6SL7's. Worked great for me.
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- tinnitus
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Look up the several examples of phono preamps on the National.com web site. Look to the apps on the LM4562 or the LME49740 quad opamp. They have passive/active EQ sections and precise RIAA curves and a unique psu filtration supply using these very low THD and noise opamps.
Jim Williams
Audio Upgrades
Audio Upgrades
Not so much. SN7's have lower gain, sort of like an octal 12AU7. They are good audio tubes though and worth keeping around.crow wrote:I just harvested a crapload of 6SN7's from an organ a friend of mine was throwing away. Would this be a good use for such a thing?A-Barr wrote:Here's the standard RCA version
http://www.tube-amp.de/6SL7-riaa/rca-manual.gif
Calls for a 7025 but I read somewhere that it specs out slightly better with 6SL7's. Worked great for me.
...Another phono suggestion, if you want to get really fancy: http://www.johnhardyco.com/pdf/990-2007.pdf
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