AN/TNH-21, AN/TNH-21A, AN/TNH-21B, AN/TH-21C
4 channel, 5 speed Audio Recorder-Reproducer
Used in intercept stations, maybe elsewhere - See photos and info towards the bottom of this page on CFS Alert
I need a schematic or manual to restore my unit - please send me e-mail
if you can help.
Manufactured by Video Research Corporation, Riviera Beach, FL
Manual - AN/TNH-21 manual, National Security Agency
rear panel - 4 inputs, 4 outputs
"audio transfer" & remote connector
rear view with motor control board folded down
top view, front panel to left-
Capstan motor in center
Take-up reel motor at bottom
top view, front panel to left-
Supply reel motor at top,
Idler flywheel in middle
Capstan motor at bottom
right side view, front panel to left -
Take-up reel motor at top
Capstan motor in center
Capstan shaft/tachometer at bottom
left side view, front panel to right -
Supply reel motor at top,
Capstan shaft/tachometer in middle background
Idler flywheel below in foreground
Left side view, front panel to right -
Capstan motor above and belt to Capstan shaft/tachometer below
Left side view, front panel to right -
Idler flywheel in foreground
Capstan shaft/tachometer behind
-
Opened up for repair - front and rear halves separated
Opened up for repair - front and rear halves separated
Four audio channel boards
Upper - motion control board
Lower - audio monitor/control board
