See also next post on how it sounds.
If memory is corect a transformer, in fact autotransformer from a Grundig mic was used.
A ribbon mic has proximity effect making us think there is no treble. On the contrary, treble and detail is amazing but it may be masked by the bass heaviness.
Bass heaviness takes place at a close mic distance.
But what if we wish to close mic vocals for that real intimate effect and dry sound without untreated room colorations or reflections?
A Grundig GDM 311 mic was opened and the mic capsule was carefully disconnected.
Then the lowest inpedance winding was used as input for the low impedance (25-50Ω) Grampian ribbon mic. The low impedance winding has also a very low inductance so it cuts bass making a very balanced sound for close ribbon use. See Pleiades filters.
The output of the output transformer was normally connected to Grundig TK-14.
People tend to blow to ribbon mics just for a joke. And they did. Fortunately the mic survived possibly by the damping effect of the very low winding resistance of the low impedance winding. Lenz's law or the principle of conservation of energy had saved the day. If a tram train can be stopped by electrons so can a ribbon.
The Grundig GDM-311 on its own is a great mic, (possibly made by AKG?). It can capture a sound from dozens of feet away. And it sounds nice for any close distance as it is omnidirectional exhibiting no proximity effect. For some reason each surviving specimen seems to have its own character or variation in sound. 2 of them may be used for binaural recordings. See previous posts.
Anyway, listening to the BASF per 638 master tape recorded before 2000, the reality, presence and bigness, detail of the female singing voice is hard to believe.
How would Grundig TK-14 sound with a Pleiades V6 or K117 front end mic booster amplifier?
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