Counter 77

for all Revox A77, B77 and PR99MKI
four digit seven segment LED indicator
Since 2003, we have been producing this counter in the fifth generation. Initially, all components were wired. The assembly and soldering by hand was tedious, time consuming and therefore expensive. Meanwhile, we equip almost everything in SMD technology. Except for the power supply, formerly with the series regulator, nothing has changed in the circuit!
The purpose of the meter is:
Like the old counter, to count the tape length and display 4-digit in LED technology. A real time counting like the Revox A700 was never intended. To do this, you would have to tap either of both motors, or the belt length, similar to the PR99 via a pulley.
As a result, you receive:
A much more readable display of the currently playing tape length, which in turn makes it easier for you to find specific tape locations. Especially the 7.62 mm high digits can be read well from a distance; Who is already sitting directly in front of the device?
Another advantage is:
No slippage: The accuracy is better than mechanical belt-driven counters, which always slip!
Never again do you need drive belts and timing belts, which have to be replaced at regular intervals with a little effort (disassembly of the front panel and removal of the right brake band).
Specification counter 77
Counter 77 white 7.62 mm digit height revox-online

white indicators

White 7-seg. Displays look very noble and fit perfectly with the aluminum applications of Revox tape machines.
7-Seg. Displays with 5.1 mm or 7.6 mm digit height in white are only available from us.
This allows you to determine the color of the display solely by the supplied filter sheets.

colour

Only the supplied filter films determine the appearance! You can always adjust the color to your needs. You can easily switch from red to green when switching from the B700 series to the B200 series. Amber fits perfectly with the VU meters of the Revox A77, B77 and PR99.
Counter 77 colored 5,08 mm digit height
Counter 77 with zero suppression

zero suppression

We offer this counter with and without zero suppression. Mechanical counters can not suppress the leading zeros. With our digital counter it is possible and we do not want to deprive you of this option. Instead of 0004 you see the correct number 8884

Data Storage

If undervoltage is detected, for example when the Revox tapemachine is switched off, the counter readings are saved. After storage, the G-segments appear 4 times until the voltage finally collapses. When switching back on, the last counter reading is displayed.

Counter 77 after data storage
Counter 77 zero, 5.08 mm digit height

zero

The zero reading is only reached by pressing the zero key (no reset, button supplied) or meter reading 0.
1100 m tape length (LPR 35 on 27 cm spool) corresponds approximately to a count of 3800.
installation

remove the analog counter

The upper front plate of the tapemachines must be dismantled here. To do this, remove the Revox B77 or PR99 Pinch Roller and the tonehead cover. Then loosen the two screws and remove the counter with the drive belt.
analog counter, original revox
opened Revox B77 revox-online

open the device

For the digital counter, the Revox tapemachines must be opened. Both the power supply and the tap on the right winding motor for speed and direction are in the device.

mounting

On the standoffs, the circuit board of the meter is fitted and loosely screwed. With the front plate of the tape machine, the counter is aligned so that the zero key does not jam and
all 7 segments of the display are visible. Then the screws can be tightened. Pull the strands backwards.

counter 77 mounted
Solder counter 77 to the power supply

power supply

Only these two strands need to be soldered. Unfortunately we were not able to conjure a plug-in version. But there are only two strands to solder and the solder joints are very good approach. Nevertheless, you have to be carefull!

sensor board

The sensor board is mounted on the drive control of the tape machines Revox B77 and PR99 and is pluggable. This allows the drive controller to be removed from the device at any time. Stick only two films on the previously cleaned motor, fix the strands with the supplied cable ties and reassemble the machine
counter 77 sensor board for motion detection
Shop
Here you will find the counter for Revox A77, B77 and PR99MKI in our  revox-online-shop
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