HIGH END U-47 STYLE TUBE MICROPHONE


        SPECIFICATIONS

  • Backplate material: brass
  • Capsule diameter: 35mm
  • Membrane diameter: 27mm
  • Membrane material: 6 micron gold-coated mylar.
  • The capsule is mounted on a 7 mm thick aluminium plate in a special way to minimize the effect from physical vibrations.
  • The sensitivity of the front and back side of the capsule do not differ more than 0,3 dB. The sensitivity between different capsules do not differ more than 0,5 dB.
  • The tight manufacturing tolerance will lead to a very good consistency between different GA-47 units.
  • The capsule is specially designed to complement the electronic circuit of the GA-47 to achieve a frequency response curve with a nice balance between the high, middle and low frequencies

The mic body is made of brass, the grille is made of iron.

The GA-47 uses a NOS Telefunken 800 series super low noise pentode tube connected in triode mode in order to decrease distorsion and noise.

The GA-47 transformer is especially designed with a 6.5:1 dual bobbin transformer by a reputed transformer factory.

The grille, which is a critical component affecting the sound character, is similar to the one in the U47.

This tube is modern glass derivative of the VF14M used in the vintage U-47.

It is a replica of the BV8 transformer used in the vintage U47. It uses a high quality core material.

G-47 TESTING BY GUITAR SOUND SYSTEMS

TESTIMONY BY GEORGE MURPHY

"

All in all, the GA-47 is an amazing “boutique" tube mic and a great "bang for the buck".

It's an all-round mic and very flexible, just like the original U-47. In the blind shoot out, many people even preferred its sound over the real Neumann which is 8-10 times more expensive.


Gearslutz

ABOUT

The Neumann U-47 microphone is one of the most highly revered and sought after microphones of all times. Being a true classic, the U-47 really needs no further presentation. Due the high cost and low availability of vintage originals, especially ones in good condition, a number of manufacturers are producing U-47 clones. The selling price of the clones are covering a broad price span, several of them are sold at  high price points.

Any manufacturer putting a U-47 clone on the market is bound to get the same question: “Does it sound like a U-47?”
My take is that this is the wrong question to ask, I would like to rephrase the question to:
“Does it offer the classic qualities and advantages that a vintage U-47 in perfect condition do?”

The Neumann U-47 was produced between 1949 and 1965 meaning that the vintage original units are now very old and their performance do differ a lot depending on their condition. The different clones all have their specific sound character too. So, it´s not easy to say which sound is “the right one”.  As always, not the least as far as microphones goes, it will ultimately be a matter of taste.  "Does the world need one more U-47 clone?" Since we are now presenting the GA-47 microphone as the first product in  Golden Age Projects new high end line, changing “Project” to “Premier” for this product range, the answer is “Yes!”.  

 After a lot of experimentation and valuable feedback from pro users testing prototype units, we did feel that it was indeed possible to bring something new to the table.

The Golden Age Premier GA-47 has been born from a lot of hard work and real world testing. The end result is a microphone with a very sweet character that should appeal to a great number of users and a microphone that can be used for the most demanding recording tasks. It has proved itself to be a great allrounder, this is not a “vocal-only” microphone.

The GA-47 is not a product that will be built in huge quantities on a big assembly line. It´s a product that is built by hand, fifty units at a time in a small workshop by a skilled and dedicated staff.
It uses very high quality components all the way to achieve the desired goal, allowing me to answer “yes!” to the rephrased question mentioned above.

 I believe that the level of quality and dedication that the GA-47 provides normally comes at a very high cost, also in the world of U-47 clones. To make it available to many more users, we have decided to sell the GA-47 at a very competitive price.

Bo Medin, December 2017


GA-47

BUILD INFO

MIC BODY AND GRILL

TUBE

OUTPUT TRANSFORMER

The mic body is made of brass, the grille is made of iron.

The GA-47 uses a NOS Telefunken 800 series super low noise pentode tube connected in triode mode in order to decrease distorsion and noise.

The GA-47 transformer is especially designed with a 6.5:1 dual bobbin transformer by a reputed transformer factory.

The grille, which is a critical component affecting the sound character, is similar to the one in the U47.

This tube is modern glass derivative of the VF14M used in the vintage U-47.

It is a replica of the BV8 transformer used in the vintage U47. It uses a high quality core material.

MICH INTERIOR

POWER SUPPLY, TRANSFORMER 

and ELECTROLYTIC CAPACITORS

CAPACITORS AND RESISTORS

CAPSULE

The electronic circuit is built with point-to point wiring, all soldering points made with Mudorf Msolder Supreme silvergold solder.

The vintage style power supply PSU uses a high power R-style transformer with a low noise level and minimum stray field.

The coupling capacitor is made in United Kingdom, the brand is Ciarit, the same type used in the famous and very expensive B&W Nautilus loudspeaker.

The capsule for the GA-47 is designed to provide the requirements of modern day recordings.

All of the inside wire use pure silver wire and decrease the loss during the circuit transmission, also it can ensure the sound quality is transparent.

A simple but effective circuit uses dual-stage filtering for the filament voltage. The High voltage is also precisely filtered and stabilized using an ON semiconductor zener diode.

It is an axial capacitor made from MKP material with copper pins. It has a delicate, full sound and a wide frequency response.

by mixing the character between a vintage K47 capsule and the one from a K67-style capsule with a wide frequency response and high sensitivity. The result is a truly great sound.

All components which are connected to electrical ground is connected to the ground plane on the circuit board.

The polar pattern switch is placed on the power supply so that the recording engineer can change the polar pattern between Cardioid and Omni remotely.

Other used capacitors are MIAL polystyrene film capacitors with very low loss.

Being a dual-sided one, it provides the GA-47 with both cardioid and omni polar patterns.

All other component connections use point to point wiring which results in virtually zero loss and crosstalk.

A ground lift switch will help to solve mains power related noise issues that can appear in some cases.

The resistors are ALLEN BRADLEY carbon film resistors made in the USA with vintage and warm sound.

 In order to get a good consistency between units, for each production run of 50 pcs GA-47 units, approximately 200 capsules is evaluated in order to find 50 capsules with specifications that lie within the tight tolerances.

STATEMENT BY GEORGE MURPHY - HEAD ENGINEER AT EASTCOTE STUDIOS IN LODNON,  ABOUT THE GA - 47.

“My previous experiences with U47’s have of course always been amazingly positive. It’s one of my favourite microphones, whenever I work in any studio that has them, I’ll always have as many of them as they have out on the floor, ready to go. They’re such a universal mic, it’s tough to record anything badly with one. I was very excited to be given this microphone to try out from Golden Age, and I’ve incorporated it into every session I’ve done since I’ve had it. 

The first time I got it out, I was working with a female vocalist I’d never worked with before. Usually there’s routine for a new singer – we’ll put up a few different mics and have a little shoot out and see what sounds best. The first one we tried was the Golden Age 47 and that was the end of the test. Everybody in the room was happy; it sounded incredible. We got the singer in, had her have a listen back to it and you know, we couldn’t ask for anything more from the sound, straight away that was a good sign.  

Since I’ve had the GA-47 in the studio it’s been on every session. I’ve tried it on so many different things just to stretch it and see what it’s good at. 

 I haven’t found a source that it’s bad at so far, and it’s been pretty varied - as a drum overhead it shines, the top end on it is perfect for that, it’s not too hyped so it doesn’t make anything sound harsh but the transient response is gorgeous. Guitar amps have been beautiful and clear through it, and vocals have sounded incredible. It’s an all-rounder certainly.

The thing I like the most about the sound of this 47 is it’s real to me, it sounds real. It’s a little bit flattering but not in a way that removes you from the source at all, it just sounds like a beautifully clear picture of everything you want to hear. I’ve tried a few other emulations and modern tube mics and they tend to have this kind of hyped top-end or overly reinforced low-end to try and make something sound more widescreen, but if you’re recording a good source you want the mic just to do it justice and not to mess with it too much then the GA-47 does that fantastically.”