some advanced recording techniques for your ReVox B77 and PR99… ...for the A77 blip here

Echo effects:

During a recording, the recorded information is reproduced immediately off the reproducing head with the following delays:

0.34 sec at 3.75 ips, or

0.17 sec at 7.5 ips tape speed.

If the delayed signal is returned into the recording channel via the internal transfer circuits, flutter-echo can thus be produced.

Echo effects are possible already while recording or one may add them to an existing recording when transferring it from one track to the other.

Adding echo while recording:

When recording on the left channel (REC L), set the input selector right (28) to L > R.

The INPUT LEVEL control (21) is used to adjust the intensity of the echo effect.

When recording on the right channel (REC R), set the input selector left (27) to position R > L.

The INPUT LEVEL control (20) is used to adjust the intensity of the echo effect.

Adding echo to an existing recording:

If the existing recording is on the left channel, it has to be transferred onto the right channel.

Record pre-selector REC R (22) switched ON.

Input selector right (28) L > R.

INPUT LEVEL control right (21) adjusts the intensity of the sound which is being transferred. The other channel is utilized to produce the echo effect:

Set INPUT SELECTOR (27) R > L.

INPUT LEVEL control left (20) is used to adjust the intensity of the echo effect.

If the existing recording is on the right channel, it has to be transferred onto the left channel.

Record pre-selector REC L (18) switched ON.

Input selector left (27) R > L.

INPUT LEVEL control left (20) adjusts the intensity of the sound which is transferred.

To produce the echo effect:

Set input selector right (28) set to position L > R

INPUT LEVEL control right (21) is used to adjust the intensity of echo effects.

Automatic end of tape switch:

To stop the tape transport mechanism at the end of a tape, the head assembly of the B77 recorder is equipped with an infrared light-gate. When reaching the end of a reel of tape or in case of tape breakage (faulty splice) the transport mechanism will STOP automatically out of any operating mode. With this simple means the automatic sensor may be utilized to perform other functions as well:

Stopping the tape at any pre-selected point.

By splicing a short length of clear leader into a reel of tape, the STOP function can be activated at any freely selected point within a reel of tape. To activate the automatic stop out of play, a length of at least 1/2 inch of clear leader is required. If automatic STOP during fast wind is required the clear leader must have a length of 5 inches approximately.