Microphone Transformers
Microphone transformers are normally used for impedance matching:
At mic preamp input circuits to match microphones to preamp.
In tube microphones for matching high impedance tube circuits to normal output impedance.
In ribbon microphones to transform very low voltage, very low impedance ribbon motors to normal microphone output levels.
General properties of Lundahl microphone transformers :
PCB mount style (with exceptions)
High level capability
Excellent magnetic and electrostatic shielding
High mu cores (mu metal or amorphous strip core)
For Breakout PCB's, check here
Microphone Transformers
Model | Turns Ratio | Size LxWxHmm | MAX Prim Level | Comments | Price USD |
1+1:1+1 | 38x24x17 | +16dBU | The "standard" problem solver. Ground isolation, MS decoding, splitting 1 direct + 1 isolated outputs. Mic input 200:800 Ω. | 67.00 | |
1+1:2.5+2.5 | 38x24x17 | +10dBU | 200:5kΩ | 68.00 | |
1+1:3.5+3.5 | 38x24x17 | +10dBU | 200:10kΩ Also used in DI boxes 10k : 200Ω | 68.00 | |
1+1:5 | 38x24x17 | +10dBU | 200:5kΩ Probably the best 1:5 microphone input transformer available | 77.00 | |
1+1:1+1 | 38x24x20.5 | +13dBU | 200:5kΩ High level version of the LL1538 | 89.00 | |
1+1+1+1:4+4 | 30x23x14.5 | +13dBU | 200:3.2kΩ if used 1:4. Many other connections possible | 88.00 | |
1+1:1+1 | 38x24x17 | +10dBU | 200 : 200 Ω or 200 : 800 Ω. For low impedance input mic preamps such as Jensen JE-990 | 74.00 | |
1+1:1.75+1.75 | 38x24x17 | +10dBU | 200:2.5kΩ | 77.00 | |
1+1:7 | 38x24x17 | +10dBU | 200:10kΩ Same pinout as the LL1538 | 77.00 | |
1+1:14 | 38x24x17 | +10dBU | 50:10kΩ Same pinout as the LL1538. For low impedance source. | 77.00 | |
1+1:10 | 38x24x17 | +10dBU | 50:5kΩ Same pinout as the LL1538. For low impedance source. | 77.00 | |
1+1:10 | 38x24x20.5 | +13dBU | 50:5kΩ Same pinout as the LL1538. For low impedance source. | 89.00 | |
1+1:4 | 26x17x12 | +2dBU | 200:3.2kΩ Small size | 62.00 | |
1+1+1+1:10+10 | 30x23x14.5 | +14dBU | Mic input. DI-box. Moving coil input | 92.00 | |
1+1+1+1:4+4 | 37x23x12 | +7dBU | 50:3.2k if used 1:8 Many other connections possible | 77.00 | |
1+1:55+55 | 30x23x14.5 | Ribbon microphones (used 1:110) Amorphous core. For active output stage | 91.00 | ||
1+1:5+5 | 38x23x16 | +7dBU | DI (direct input) used 10:1 Mic input 200:20k | 71.00 | |
(2+1)+(2+1):4+4 | 48x29x20 | +14dBU | Can be connected for 75,150,300 and 600Ω microphones into 1200Ω | 98.00 | |
9:1+1 | 31x25x16 | Tube microphones. Silicon-iron C-core, which results in a transformer with more "transformer sound character", compared to a classic mu metal lamination transformer. PCB mount style. | 60.00 | ||
1+1:14 | 37x22x17 | +10dBU | Compatible with LL1577, but with reduced internal capacitance | 68.00 | |
2:1 | 25x15.8x14.5 | +15dBU | Output transformer for solid state microphones | 62.00 | |
1:37 | 27x18.8 diam | Ribbon microphones. Amorphous core. Flying leads. No housing | 78.00 | ||
1+1+1+1:37 | 30x22.5x14.5 | Ribbon microphones. Amorphous core. PCB version of LL2912. With mu metal housing. | 78.00 | ||
1+1+1+1:37 | 38x24x17 | Ribbon microphones. Mu metal core version of the LL2913 | 67.00 | ||
1:37 | 36x22 diam | Ribbon microphones. Mu metal lamination core. Flying leads. No housing | 71.00 | ||
LL2916 | 1+1:55+55 | 38x23x26 | Mu metal lamination core version of the LL1927A | 80.00 | |
1+1+1+1:2+2+2+2 | 66x32x21 | +16dBU | 200:313kΩ (used 1:8) This is the ultimate microphone input transformer, designed for high quality tube equipment | 143.00 | |
LL7903Ag | " | " | " | As per the LL7903 above but wound using silver wire | 639.00 |
1+1+1+1:5.6+5.6 | 66x32x21 | +16dBU | improved version of the LL7905 | 143.00 | |
LL7906Ag | " | " | " | As per the LL7906 above but wound using silver wire | 639.00 |
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Breakout pcb's for Lundahl audio transformers