Bo Hansén
Gothenburg, Sweden

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microphone page


please note that no products on this page is for sale
these are for information only

 

 

condenser microphones

click images to enlarge

Neumann M149
Level modification, gain
switch in 5 step
+12, +6, 0, -6, -12 dB
0dB= same as U67
output level		 Neumann M149 modification inside.jpg (308908 byte) Neumann U67
Recapped and renovated
Capsule cleaned

 

6x Neumann U67.JPG (1641893 byte)
 

 
 

 

 Neumann M269
Recapped and renovated
Capsule cleaned

Neumann M269.jpg (196559 byte)

Neumann U87i
Recapped
Capsule cleaned

Neumann U87i.jpg (185123 byte)
 

 
Neumann U47 fet
Recapped and renovated
Capsule cleaned		 Neumann U47fet.jpg (227623 byte) Neumann M49
 Recapped
AC701 tube change		 Neumann M49.JPG (900793 byte)
 

 
Neumann M149
Changed to -12 dB lower
output level.
(same as U67 o/p level)		 Neumann M149.JPG (1818741 byte) Neumann U47
Repaired and renovated.
New tube socket, caps and some resistors

 

 Neumann U47 HS2.jpg (339092 byte)
 

 



 

 Neumann U47
Repaired, renovated and
restored after someone´s
poor work.
New power resistor, caps, V14 tube and transformer		 U47 mounted PK.jpg (254909 byte) Neumann KM54
Fixed contact and ground fault.
New transformer coupling capacitor

 

 Neumann KM54.jpg (82030 byte)
 

 
 

 

 Neumann KM56
Fixed contact and ground fault.
New transformer coupling capacitor 		Neumann KM56.jpg (101977 byte) Schoeps CMT56
 Recapped 		Schoeps CMT56.jpg (189129 byte)
 

 
Pearl, Milab DC73
Recapped 		Milab DC73.jpg (346088 byte) Nevaton MC51
Circuit bord replacement 		Nevaton MC51.jpg (359408 byte)
 

 


 

 AKG C414EB
Recapped
Cleaned capsule
Take care of "motorboating" problem in hyper cardioid pattern mode 		AKG C414EB.jpg (181782 byte) AKG C414EB-P48
Recapped
Cleaned capsule 		AKG C414P48.JPG (571724 byte)
 

 
AKG C451EB, C452EB
Recapped 		AKG 451EB, 452EB.jpg (706512 byte) AKG C535EB
Recapped 		AKG C535EB.JPG (1270451 byte)
 

 
Neumann SM69
Recapped
AC701 tube change 		Neumann SM69.JPG (865327 byte) Neumann TLM170
Recapped
DC-DC converter repair		 Neumann TLM170.JPG (902798 byte)
 

 
Manley Reference Gold
Repair		 Manley Reference Gold.JPG (920827 byte) Thuresson CM402
Repair		 Thuresson CM402.JPG (1000570 byte)
 

 
AKG C61
Repair		 AKG C61.JPG (511348 byte) AKG C414ULS
Body frame repair		 AKG C414ULS frame rep..jpg (326040 byte)  
 

 
Neumann U87
Old version
Recapped		 Neumann U87 old.JPG (938346 byte) Neumann U87Ai
Newer SMD amp version.
Down grade to single JFET transistor version		 Neumann U87Ai new.jpg (262684 byte)
 

 
Hansén HCM101
In 2004, 50 of these were
heavily modified.
Better front end and output amp, add voltage regulator, changed gain structure and much more		 HCM 101 body.jpg (268990 byte)  HCM 101 pc-cards.JPG (972742 byte)

  HCM 101 inside.jpg (1300751 byte)  HCM 101 in-outside.jpg (1181767 byte) lots of HCM101.jpg (171042 byte)
 

 
AKG C12VR
recapped		 AKG C12VR.jpg (583416 byte) AKG C414EB-P48
An experiment to mount a newer C414XLS capsule with four rubber cords instead of the original capsule with two screws		 AKG C414P48 capsule mod.jpg (537813 byte)
Sela T24
recapped

A Swedish made mike with angled M7 capsule intended to hang down from a mike boom for film recording		 Sela T24.jpg (684350 byte) Neumann/Gefell UM57
Repaired, renovated and
restored after previous service work

Gefell UM57.jpeg (465030 byte)
 

 
Schoeps/TFK M221B
Recapped		 M221B.jpg (239056 byte) Neumann U64
Recapped.

Same as KM56 (predecessor to KM54) but with nuvistor 7586 instead of AC701 tube

 U64.jpg (268738 byte)
Altec M51/195A
Repaired, renovated and special construction of a new power supply
(only the casing from an Alctron/T-Bone is used)		 Altec M51.jpg (765982 byte) Neumann SM2
Recapped and renovated		 SM2.jpg (382420 byte)


power supply

click images to enlarge

 

 Neumann U47
NG power supply
Totally rebuilt and renovated 		Neumann NG47 HS.jpg (267347 byte) Telefunken M940
U47 power supply
Reissue version, poorly mounted caps, fixed 		TFK M940.jpg (351189 byte)

TFK 940 modif..jpg (349796 byte)
 

 
Neumann 
N52a power supply
Replacement of "stabilyt" in filament/heater section,
with a IC-regulator 		 Neumann N52a.jpg (299166 byte) Neumann NU67
U67 power supply
Recapped		 Neumann NU67.JPG (1297088 byte)

Neumann NU67 pcb back.JPG (1419596 byte)
 

 
Power supply for AC701 microphones
A bunch of totally rebuilt Alctron/T-Bone PSU.
Orginaly made for 120v and 6v, now modified to adjustable 120v and 4v with more stable/cleaner voltage to the microphone.
Also, the original was very poorly built and had dangerous internal mains wiring.		 PSU 120-4.jpg (724408 byte) PSU cards.jpg (760785 byte)

Modified printed circuits boards for this power supply

 PSU SM2.jpg (448420 byte)

One of these power supplies specially made for the Neumann SM2 stereo microphene

 

dynamic microphones

click images to enlarge

AKG D12
Unfortunately very hard to find new spare membrane
to day		 AKG D12.jpg (360111 byte) Beyer M260
Good sounding vocal miniature ribbon.
Fragile to fail on the floor, as the glued magnetas
loosen and squeeze the ribbon		 Beyer M260.jpg (247807 byte)
 

 
Golden Age R1 ribbon
Changing transformer to a better Lundahl type		 Golden Age R1.jpg (1180140 byte) Sennheiser MD407
Convert to 200 ohm balanced.
New cable and XLR connector		 Sennheiser MD407.jpg (495775 byte)
 

 
Sennheiser MD21 and MD421
Total repair and restoration.
Also modification from the "HN" version to normal
200 ohms balanced
connector pinout		 Sennheiser MD21, MD421.jpg (193797 byte) Sennheiser MD421
Convert the old Tuchel
to a XLR connector.
Also remove the old "magnetic" bass cut filter,
it influence the sound quality even in the "M music mode"		 Sennheiser MD421, connector mod..jpg (75325 byte)
 

 
Shure 545S and 545SD
The classic versions from 1960/70s
R45 cartridge/capsule replacement		 Shure 545S, 545SD.jpg (164316 byte) Lot of old Shure capsules
Broken from repaired microphones		 Shure capsules.jpg (269458 byte)
 

 
Sennheiser MD421
Convert the old Tuchel
to a XLR connector.		 MD21 XLR mod.jpg (224087 byte)

 


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updated 2022.09.18