Bo Hansen
Well-known member
Since the 1960s, I have heard of Howard Holzer, Haeco/Holzer Audio Engineering Company. (Van Nuys, California ?)
The reason for this is that one of the old well-known recording studio here in Sweden called Metronome Studio, had equipment from Haeco, partly in the form of cutting equipment and also Holzer discrete op-amplifiers included in their old home-built mixing console along with Disa tube amplifiers.
This console was replaced and was scrapped in the early 1970s, when they installed a new Neve console.
Today it is difficult to obtain information about Holzer/Haeco, it is written almost nothing about this old business on the web, the only thing I can find is some info on a "CSG" compatible stereo generator, a stereo/mono signal process used for disc cutting, and a few short lines of text, in connection with an article about A&M Recording Studios.
I'm most curious about Holzer discrete op-amplifier, they are integrated in a module with a "male noval tube socket" as connector.
Read somewhere that John Stephen (Stephen tape recorders) made a similar op-amp that was pin-compatible.
The old home built Metronome console is gone long ago, and even the engineer who built it, so there is no information to find there.
Is there anyone here on this forum, who knows something about this op-amp, you might have an old brochure/datasheet or a schematic of the circuit in the module.
I am also interested in additional information regarding Howard Holzer and his company Haeco.
Btw,
As John Stephens op-amp is supposed to be like, is of course info on this also interesting.
Best from
Bo
The reason for this is that one of the old well-known recording studio here in Sweden called Metronome Studio, had equipment from Haeco, partly in the form of cutting equipment and also Holzer discrete op-amplifiers included in their old home-built mixing console along with Disa tube amplifiers.
This console was replaced and was scrapped in the early 1970s, when they installed a new Neve console.
Today it is difficult to obtain information about Holzer/Haeco, it is written almost nothing about this old business on the web, the only thing I can find is some info on a "CSG" compatible stereo generator, a stereo/mono signal process used for disc cutting, and a few short lines of text, in connection with an article about A&M Recording Studios.
I'm most curious about Holzer discrete op-amplifier, they are integrated in a module with a "male noval tube socket" as connector.
Read somewhere that John Stephen (Stephen tape recorders) made a similar op-amp that was pin-compatible.
The old home built Metronome console is gone long ago, and even the engineer who built it, so there is no information to find there.
Is there anyone here on this forum, who knows something about this op-amp, you might have an old brochure/datasheet or a schematic of the circuit in the module.
I am also interested in additional information regarding Howard Holzer and his company Haeco.
Btw,
As John Stephens op-amp is supposed to be like, is of course info on this also interesting.
Best from
Bo