power on delay ESV 77


for all Revox A77 MKI, II, III and IV
Switch-on delay Revox A77 without VU meter protection revox-online

Version 1

We offer the switch-on delay in two versions. Version 1 is without VU meter protection. This version is completely pluggable. This is very easy and also inexpensive!

Einachaltverzögerung Revox A77 von revox-online

Version 2


The second version still includes a VU meter protection. Here, the strands must be plugged in addition 4 strands are soldered. This can be done very easily!
Switch-on delay Revox A77 with VU meter protection revox-online
the original from revox-online, delay electronics

Electronic


Both versions have the same delay electronics, only the relays and the extra leads make the difference.

Time


The delay time is about 5 to 7 seconds. This should be sufficient in most cases to effectively suppress the switch-on!
the original  revox-online   delay time 5 - 7 seconds
Installation ESV 77 without VU meter protection
Revox A77 rear view

Take A77 out of the housing


Loosen the 4 rear housing screws and tighten the dummy plug for the wired remote control.
Pull the device forwards out of the housing .
This is a bit difficult, please be patient!
Revox A77 Rückansicht

Output A77


Place the device on a styrofoam pad at the side so that the power plug is down. Disconnect three blade receptacles (AG9 br, AG8 vio and AG7 gn) from the switchboard of the Revox A77 and insulate with the supplied shrink tubing.
Output connector Revox A77
Revox A77 output reconnected

Connect output


Now connect the blade receptacles with the ESV 77, as shown in the photo, and connect the strands from the ESV 77 to the released flat plugs of the Revox A77 (AG9 br, AG8 vio and AG7 gn).
Revox A77 neue Verbindung

tension


Disconnect the yellow wire (ground, DF2) and the purple wire ( 27V, DF1) from the drive control.

To improve the visibility the supression capacitor was removed for this photo.
Revox A77 + 27V voltage connection
Isolate the Revox A77 + 27V voltage connection

insulation


Although the other tabs do not necessarily have to be isolated; The tabs of the power supply must be isolated!

Connect voltage


The strands are free and therefore require good and safe insulation!

Revox A77 + 27V restore old connection
Revox A77 + 27V flat plug

Connect ESV


The flat plug-in sleeves ge and vio, coming from the ESV 77, are now plugged into DF1 (vio) and DF2 (ge).

Revox A77 27 V anschließen

cable ties


The supply line of the power supply is fixed with two cable ties.

Lay the Revox A77 + 27V cable
Fix switch-on delay in Revox A77

Platinum


The PCB is attached to the chassis of the Revox A77 only with a cable tie. The circuit board of the switch-on delay weighs nothing and the attachment is completely sufficient! It is sufficient if you only tighten the cable tie loosely.

Revox A77 ESV +27 V anschließen
Installation ESV 77 with VU meter protection
Install switch-on delay with VU meter protection in Revox A77

ESV 77 

The installation of the ESV 77 is the same as for the ESV 77 without VU meter protection.
Only two additional white and two blue strands are needed here.
ESV 77 mit VU-Meter-Schutz

cable management


The strands are placed over the audio boards and to the respective Rec-Amp. Printed circuit boards of the Revox A77.
Install cable routing VU meter protection Revox A77
Solder white cable VU meter protection Revox A77

Rec.-Amp. .705


After removing the shield plate, the rec. Amp boards can be easily removed and modified. The modification is limited to the soldering of two strands. This is not rocket science. Fix the strands with cable ties.
ESV 77 mit VU-Meter-Schutz

Detail


On the left is ground, on the right the VU-meter signal is still in front of the capacitor C509 with 10 μF.
There is no need to do more.
Now plug the circuit boards into the Revox A77, mount the shield plate and push the device back into the housing!
Solder the blue cable VU meter protection Revox A77
ESV A77
in our shop

Here you will find the comfort gain for your Revox A77
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