80s vocal processing - Gearslutz thread

https://www.gearslutz.com/board/so-much-gear-so-little-time/48621-80s-vocal-processing.html

Beyerdynamic input transformer TR/BV 351005003 inductance of windings

It is a 1:5 transformer according to the 005 code in the part number.


Primary (red black cables) inductance was measured:
6.3H at low frequency (97Hz)
1H at mid frequency (1024Hz)


Secondary inductance 165H at low frequency (97Hz).


How would the Gramian ribbon GR2/L microphones sound trough them then
directly connected to UHER 4200 Report? Their low impedance (25Ω?) microphones would be raised to about (600Ω?).

AKG catalogue 1973

http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/AKG%20Microphones%20and%20Headphones%20(Jan.%201973).pdf

UHER 4200 report with AKG MI 201-100 (Philips N8211)

Tried with Vicky's UHER 4200 report stereo tape recorder.


Signal path:


Male or female singing or speech voice - MI 201-100 - UHER 4200 report (slowly recovering) - BASF SM911 - UHER 4200 report reproducing - Pleiades linoleum Auratone 5C type speaker (linoleum unglued yet)


It sounds nice.


There is some bass heaviness.


It may sound great with a suitable Pleiades (R,L) filter to reduce bass heavines perceived by listener's brain due to Fletcher Munson curves, voice effort curves, bad room acoustics etc. [Lowe, Morgan]


Reference:


Sound Picture Recording and Reproducing Characteristics - D. P. Lowe, K. F. Morgan - Journal of the Society of Motion Picture Engineers

Some Pleiades gentle low cut filters for omni microphones

Omnidirectional microphone do not have a proximity effect of bass boost.


So naturally they would need a lees strong Pleiades filter.


Inductance can be greater.


Examples:


UHER M640
sounds very nice on male vocals with a
Pleiades (610Ω,140mH)
Higher values of inductance like 200mH sound nice too


AKG D130
High output mic as this is a large diaphragm.
A suitable Pleiades (R,L) gentle slope LC filter:
Pleiades (310Ω,140mH) or higher R
It can remove that muddy bass emphasis when singing and the mic can sound amazing.
When speaking a filter might not be needed.


signal path:


Male singing Creep - Radiohead - omnidirectional mic - Pleiades (R,L) filter - Sony TC-D5 Pro - Sennheiser HD 580 - listener's (singer's) brain

AKG D558B

This one was almost sticking out of the small box it had been packed after buying thorough eBay.de  (the mic had made a slit hole in the cardboard box!).


It was thoughly cleaned. It has so many extra fine meshed of silk like metal cloth which were washed with detergent and a extra fine 5000+ Hair Curaprox toothbrush. (At your risk)


It operates better now.


Not sure yet if this mic can be suitable for vocals. It may be useful for acoustic guitar.


It is small diaphragm.


The UHER M640 front which is plastic looks like it.
The M640 sounds great. Does it have the same capsule as the omni series D510?


How does the D510 sound like?

Some almost happy accidents in music making

By Tom Barnes:
https://www.mic.com/articles/118644/8-amazing-moments-in-music-history-that-almost-never-happened