found an old turntable, no needle, no cartridge, but a RIAA board inside. there was a bypass switch so the user could connect the turntable to either a phono or tape/aux input.
are these RIAA boards any good? like worth putting into a hifi receiver?
thanks.
are these RIAA boards any good? like worth putting into a hifi receiver?
thanks.
GlidingDutchman said:
Garrand. Old school. All discrete components (not that thats a bad thing). Does work though.
Never seen a Garrard phono before...
Maybe a pic? It could be good for general use...
What power rating? Drive it with a battery!
D
Maybe a pic? It could be good for general use...
What power rating? Drive it with a battery!
D
well, we were cleaning out a garadge so i just snipped the RIAA out of the dead turntable and junked the rest, so regretfully cannot provide a photo.
however i did take it home, put a 9V battery to it along with a turntable and connected the output to amplified headphones. got decent sound on both sides.
however i did take it home, put a 9V battery to it along with a turntable and connected the output to amplified headphones. got decent sound on both sides.
also the RIAA board i want to replace has just 4 small sig transistors in it. what to you all think would be the chances if i changed all of those 4 transistors on my original RIAA that board would work again?
gain said:
If you change the semiconductors carefully and with the same spec units it might just work beautifully!
Try it.
Do you have a pic of the RIAA board?
D
the best place for a low level signal amplifier is right next to the source.
Well, you can't mount it in the headshell, so the next best is directly below the leadouts from the arm.
Well, you can't mount it in the headshell, so the next best is directly below the leadouts from the arm.
AndrewT said:
absolutely Andrew. less antenna / noise pickup effects that way. so maybe its best to put the RIAA's in the turntables themselves?
are we saying "go or no go" for putting the RIAA in the turntable or for you re-casing and using the Garrard RIAA?
-Justin
-Justin
gain said:
Okay... a few questions:
What turntable setup do you use?
What tonearm is fitted?
What cartridge?
How serious are you?
I would suggest this:
Keep RIAA amp and mount in small box with RCA's and a 9v battery terminal tag - for transport etc. Dont mount inside t/t.
Try to replace all caps with quality units as well as resistors in critical signal paths. Shield the casing with copper foil.
D
GlidingDutchman said:
- Yamaha
- Not the linear one, the one thats mounted on a central point and swings as it plays.
- No idea on the cartridge. do know that its magnetic.
- Serious enough to want to listen to records in high quality sound.
Looking at the pictures I would say the RIAA is a low level product but this depends what you'll need really.gain said:
happy to report good results. put RIAA board from junk turntable into radio-sh**k project box, along with two pairs of RCA females and hooked everything up.
first try, had sound. good sound. and plenty of it, but also had a hum. a very noticeable and annoying hum.
noticed the turntable had a third wire coming from it molded to the same RCA output cable, but just a single conductor. after some continuity testing, found that wire was a ground to the turntable. tried connecting it to the PS ground terminal of the RIAA board. made the situation much worse. increased hum along with a buzzing. my next attempt was to tie the wire to ground of the receiver, which in my case is the chassis, along with the CT of the PS transformer.
problem cured. turntable is now quiet as a mouse and sounds great. so i surmise turntables dont ground through the RCA sleeve but through a separate wire? at leas that was the case with mine.
first try, had sound. good sound. and plenty of it, but also had a hum. a very noticeable and annoying hum.
noticed the turntable had a third wire coming from it molded to the same RCA output cable, but just a single conductor. after some continuity testing, found that wire was a ground to the turntable. tried connecting it to the PS ground terminal of the RIAA board. made the situation much worse. increased hum along with a buzzing. my next attempt was to tie the wire to ground of the receiver, which in my case is the chassis, along with the CT of the PS transformer.
problem cured. turntable is now quiet as a mouse and sounds great. so i surmise turntables dont ground through the RCA sleeve but through a separate wire? at leas that was the case with mine.
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