Become a Site Supporter and Never see Ads again!

Author Topic: Use a mic pre amp instead of phono pre-amp  (Read 1028 times)

0 Members and 1 Guest are viewing this topic.

Offline H₂O

  • Trade Count: (27)
  • Needs to get out more...
  • *****
  • Posts: 5310
  • Gender: Male
Use a mic pre amp instead of phono pre-amp
« on: June 02, 2016, 02:54:16 PM »
Maybe a stupid question, but can you use a high quality mic pre-amp (such as a EAA PSP-2 or Grace preamp) as a replacement for a phone pre-amp when transfering vinyl

I would obviously need to apply a RIAA filter digitally in post.

I am pretty sure the INA103 (same family as what is in Grace V2/V3 and what is in my Grace) data sheet has a phono pre-amp circuit example on it - which beyond the RIAA portion is very similar to a pre-amp circuit.

Are phono out's technically balanced signals?
Music can at the least least explain you and at the most expand you
LMA Recordings

List

Offline ~Jon Stoppable

  • Trade Count: (47)
  • Taperssection All-Star
  • ****
  • Posts: 1243
  • Gender: Male
    • Naiant Studio
Re: Use a mic pre amp instead of phono pre-amp
« Reply #1 on: June 02, 2016, 03:52:52 PM »
Phono outs are usually unbalanced, although it would be possible to use a balanced output if you kept the left & right "grounds" separate from the cartridge and then wired those to some sort of balanced output connector with 2-conductor plus shield wiring.  A mic amp followed by a digital RIAA filter works fine for a phono preamp.  There are plugs already written that will do that.  You would probably want to include the rated capacitive load for the cartridge somewhere before the mic amp, say in a cable connector.

Offline H₂O

  • Trade Count: (27)
  • Needs to get out more...
  • *****
  • Posts: 5310
  • Gender: Male
Re: Use a mic pre amp instead of phono pre-amp
« Reply #2 on: June 02, 2016, 05:44:11 PM »
Does it matter if the cartridge is MM or MC (I know MC has a much lower output level - i.e. just turn the pre-amp up)?

Is there a dis-advantage to doing this (other then the multiple extra steps)?



Music can at the least least explain you and at the most expand you
LMA Recordings

List

Offline ~Jon Stoppable

  • Trade Count: (47)
  • Taperssection All-Star
  • ****
  • Posts: 1243
  • Gender: Male
    • Naiant Studio
Re: Use a mic pre amp instead of phono pre-amp
« Reply #3 on: June 02, 2016, 10:09:18 PM »
Does it matter if the cartridge is MM or MC (I know MC has a much lower output level - i.e. just turn the pre-amp up)?

Either way the next device has to be an amplifier, and a good mic amp is the quietest input device available.  Dynamic mics are moving-coil too.

Quote
Is there a dis-advantage to doing this (other then the multiple extra steps)?

None that I can think of.  Perhaps with less-than-good conversion you'd increase aliasing a bit to the point that it could be audible (because the HF level at the converter would be higher, so that stopband rejection wouldn't quite be enough to suppress the ultrasonic content).  That's kind of a stretch though, just trying to think of something . . .

Offline H₂O

  • Trade Count: (27)
  • Needs to get out more...
  • *****
  • Posts: 5310
  • Gender: Male
Re: Use a mic pre amp instead of phono pre-amp
« Reply #4 on: June 04, 2016, 07:49:31 PM »
Thanks for the info
Music can at the least least explain you and at the most expand you
LMA Recordings

List

 

RSS | Mobile
Page created in 0.109 seconds with 27 queries.
© 2002-2017 Taperssection.com
Powered by SMF
Website Design by Foxtrot Media, Inc., a Baltimore Website Company