It can be seen on the Italian FBT electron tube Pereonal 1002, 2002 and the transistor mixer Pro.64.
These are fabulous PA systems with tape delay echo running at a non slow speed. The speed can be increased to 7.5ips if a little yellow neoprene cable sleeve tube such as those from Canford is inserted to the capstan.
To the playback heads just after each tape head is a series resistor and then a capacitor (shunt) to ground.
This apparently is the way the rising slope is compensated by reduction at 6dB per octave.
It may prove useful for the analog simulation of analog tape recording Pleiades experiments.
It may also be useful to use directly after a MM record cartridge to de emphasise the high part of the RIAA curve. It may be useful cutting treble from a moving magnet cartridge as soon as possible before they may be clipped by the following amplifying stages. (There is also a schematic on the Altec 1566A electron tube microphone preamplifier. It is included in the operating instructions. It is a passive plug in circuit to do full RIAA de emphasis to get the signal response to flat so that it can be supplied to the front end stage grid. It studied more carefully it may be using feedback too from the output of the first stage.)
A low noise battery powered electron tube Pleiades V series stage with the EF183 may be used in the
above situations.
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