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Where did API originally use the 312 preamp?

Discussion in 'Preamps & Processing' started by mrpatrick54, Feb 23, 2006.

  1. mrpatrick54

    mrpatrick54 Guest

    Info about the 212 and the 512 series preamps is not hard to come by.

    However, the 312 is more elusive. Were they manufactured for use in any of the 1970's consoles? If so, was there some sort of faceplate? Does anyone have pictures?

    I've just purchased one of the vintage 312 cards and I'm looking for another in order to put together a 2 channel unit so I'd like to get as much background as possible.

    I'm considering Brent Avrill's people for racking them up. Suggestions, recomendations?
  2. CharlesDayton

    CharlesDayton Active Member

    Mar 22, 2005
    I have the Brent Avrill 6 space rack with 2 312's and 2 550's. It works very well. You would have to check with them to see if your card will fit their chassis. Not all 312 cards are the same. The folks at Coast Recording(In L.A.) seem to know about them, you might ask there. Google their website.
  3. RemyRAD

    RemyRAD Guest

    Sep 26, 2005
    The 312 IS THE difinitive original API mic pre-amp. The first series had APIs own mic transformer, which was not great, albeit many hits were recorded with them. It was a silver colered can. The later units used the Dean Jensen 110K series transformer, which is a lower, wider/fatter profile silver can with the "110K" showing on the can and were a definate improvement. The API 3124 1U mixer is 4 312s! So this mid 60's mic pre is still one of the choicest units that has stood the test of time.

    The 512 is basicly the same thing in a different package (form factor). So all you really need now is an edge connector a couple of cables and a bipolar + and - 15 volt power supply at a couple of amps and you're cookin' with gas! (a utility project box is highly recomended for installing).

    Another happy 312 and 3124M owner.
    Ms. Remy Ann David

    They don't sound anything like a NEVE.
    It's like men and women. The're the same but different.
  4. RemyRAD

    RemyRAD Guest

    Sep 26, 2005
    Oh yeah the 312 was /is used in all there original consoles from the earliest 1970s and are still used as the 512 today which again IS the same thing.
  5. Forgive me for my ignorance-

    Is there a big difference between the 312 and the 512?
  6. Kev

    Kev Well-Known Member

    Nov 13, 2001
    Discrete Op Amp - DOA - 2520
    built into modular cards
    312 - mic card
    325 - line card

    cards built into modules
    often you see the 500 series modules
    512 - mic
    525 - comp
    5xx - EQs
    see Dan Alexander
    or even Fletcher
    (dead link removed)

    cards also built into complete mixers or rack units
    the numbers seem to get to 4 digits like

    1604 - mixer
    2488 - mixer
    3124 - rack unit - 4 x mic

    from memory the new 3124 is actually one very large circuit board but you can see the origins of the 312 in there

    I might be a little off base
    but that's the general idea

    the basic idea in the 312 and the new model 512 is near enough the same
    you would need to look close to see if the transformers are exactly the same
    but I think the output is the same trafo and I don't know about the input trafo
    the 512 is a module and has the various controls fitted
    mic, line, instrument
    20 dB pad, 48v phantom switches
    and does have the 2520 Op-Amp
    and has a LED based VU meter

    ... the 312 is just the basic card.
    the newer 212L is probably the closest current unit to the old 312
    but they all have the same origins

    for more detail go to API
  7. mrpatrick54

    mrpatrick54 Guest

    Thanks for some great insight!

    I read somewhere that the API 312 is more colored or fatter than the 512 or 212.
    If all three series employ the 2520 op amp than any differences would have to be the result of input and output transformers? It certainly seems likely that over the years API switched out these components.

    It seems odd, however that the 212 and the 512 are both modular designs for which API manufactures racks with power supplies and the 312 is just the card.

    I wander what API intended the 312 for?

    Brent Avrill's people want $1000 to rack up a pair of 312 cards. I know they have a reputation for doing quality work but I feel like I should shop around.

    Thanks for all the input and suggestions!
  8. FloodStage

    FloodStage Active Member

    Feb 23, 2003
    Use in API boards.

    Averill does do quality work.

    However, I called Averill a year or so about racking a couple 312's for me and was told they didn't rack up customer's modules anymore.

    Don't know if this is still the case.
  9. Oats

    Oats Guest

    i highly recommend brent-- i have had mine for several yrs now w/o incident.

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