AKG 1650Z00910 - U35B Output Transformer for AKG C414 EB (Übertrager Ü35b)

AKG 1650Z00910 - U35B Output Transformer for AKG C414 EB (Übertrager Ü35b)

AKG reference 1650Z00910 corresponds to the U35B output transformer ( Übertrager Ü35b ) used in the AKG C414 EB multi-pattern condenser microphone. This component is responsible for impedance matching and the balanced output of the microphone, and is identified as “Ü 35b” in the amplifier print and in the schematic in the C414 EB service documentation itself. Replacing the transformer with this OEM replacement restores factory electrical performance when the original has been damaged by overload, shock or aging.

In the C414 EB exploded view, transformer U35B is shown mounted on the amplifier board and explicitly labeled “Ü 35b” , while transformer “Ü 26a” belongs to the DC converter and is a separate part. Several spare parts listings confirm that part number 1650Z00910 designates transformer U35B for these classic C414s.

Main features

• AKG Genuine (OEM) Part: U35B Output Transformer for C414 EB .
• AKG service designation: Übertrager Ü 35b (present on the amplifier print and the C414 EB schematic).
• Reference number: 1650Z00910 (listed by dealers/service as “TRANSFORMER U35B”).
• Function: Impedance matching and balanced low impedance microphone output.
• Location: C414 EB amplifier board.
• Main Compatibility: AKG C414 EB (Silver Finish, Non-P48 Version).
• Not compatible with: C414 EB-P48 (that variant uses the U54 transformer, with different ratio and characteristics).

Product benefits

• Restores factory specifications for output level, noise, and frequency response of the C414 EB.
• Exact fit and reliability as it is an AKG part documented by the technical service.
• Traceable repair according to official diagrams/disassembly, ideal for studios, backline, and technical services.

Compatibility and technical notes

• The C414 EB (not P48) uses U35B ; the EB-P48 variant uses the U54 transformer (ratio approx. 6:1 ), which is not interchangeable.
• Third-party technical literature describes U35 as having a typical ratio of ≈1.33:1 in classic C414s, different from that of U54 in EB-P48s.
• “Ü 26a” (DC converter) is another microphone transformer and is not part of this reference.

Frequently Asked Questions

• Does it work with C414 EB-P48 (blackbody)? No. That version requires the U54 transformer, with a different impedance/ratio.
• Does it include a board, wiring, or other components? No. This reference applies only to the U35B transformer .
• Does it require adjustment or calibration after replacement? Correct installation and continuity/phase verification are usually sufficient; installation by qualified personnel is recommended.
• Does it work with other classic AKG headphones (C451/C452)? Some replacement parts manufacturers claim U35 compatibility with those series; always check the model and version before purchasing.

Description for projects

Output transformer U35B ( Übertrager Ü35b ) for AKG C414 EB ; reference 1650Z00910 ; mounted on amplifier board; function: impedance matching and balanced output; not compatible with C414 EB-P48 (uses U54); original AKG replacement part.