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Quad AVR-2 One Inch VTR Sony SRW BVH-2000 BVU-950 BTS BCN-50

2" Quad VTR, Accessorie & Part

AMPEX AVR-2 Low Band Monochrome board set

AMPEX / AVR-2 LOW BAND MONOCHROME BOARD SET
Image shown doesn't reflect the condition of the equipment and is for illustrative purpose only.


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Item #:EQ703372U
Condition:USED
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Equipment Description:
This board set made up of one modified Demod (board 16) & one modified Equalizer board ( board 15).

Model Description:
Ampex AVR2 lowband monochrome board with alternative equalizer board.

Equipment Details

This set include 2 modified boards:
703372-1 , LowBand set-16, AVC9875, Demod-16 off the Low Band Mono Demod & Eq dual board set. ( Assy NO 1373058-05)

703372-2,LowBand set-15, 06UF874, EQ-15 off the Low Band Mono Demod & Eq dual board set. (Assy NO 1373055-(7?)2)

Those boards are tuned and to be use toguether.
Look up how to set up sheet the VTR:
Ampex AVR-2 Low Band Monochrome Demod board set is made up of two alternative board set:
- one modified Demod (board 16) EQ703372-1
- one modified Equalizer board ( board 15) EQ703372-2.

Setting up the VTR with the new single standard signal boards.

The new boards are for a single Low Band Mono standard.
1. The video standard to be played back is a black and white standard.

2. Color framing should be set to OFF. Switch on the front of Control track and
Sync Processor should be OFF. ( board 2).

3. Equalizer ( board 15) and Demode ( board 16) should be installed with the power OFF.

4.The auto chroma board ( board 14) should be set to OFF. If left “on” the board could
operate incorrectly as in the case of sound in sync or small burst on the back porch.



Model Details

Ampex AVR2 can't play low band, usually.


As a note, they are alternative demod and equalizer boards on the internet. We found this:

Great information on how to build this board yourself by www.cameratim.com
Currently there is an issue on his website, so you may use this link:
http://www.cameratim.com/electronics/ampex-quad/avr2-lowband-modification.



Additional Detailed Information:

The Ampex AVR2 can't play lowband, usually.  There are alternative demod and equaliser boards that can be swapped in, but we didn't have any.  We did find a website selling custom modified boards that could be switched between lowband and highband playback, but the cost was rather incredible, and couldn't see that being cost effective, for us.

extract from www.cameratim.com:

Since we do have the manuals that detail both the highband and lowband boards, we went down the route of modifying some spare highband boards, and would live with swapping boards over, for the few lowband tapes we have to deal with.  There's very little difference between the highband and lowband boards, namely:

  • Capacitors and coils in the equaliser RF output low-pass filter.  The highband filter turnover frequency is 14 MHz, and the lowband filter turnover frequency is 10 MHz.
  • Capacitors and coils in the demod input low-pass filter.  The highband turnover frequence is 6 MHz, and the lowband filter turnover frequency is 4.5 MHz.
  • Some gain and DC bias resistors for the FM demodulator.
  • Various resistors and capacitors that form the demod de-emphasis filters.

Whilst the low-pass filters can be left in their original highband configuration, they won't attenuate noise that may appear in the picture as much as they probably should do.  And probably don't equalise the video signal as effectively, either.

We couldn't find core formers that would fit on the board, and faced with special ordering something to do the job, disassembling the original cores and rewinding the coils, or finding something else to wind the inductors on, we took the latter route.  We used plastic sewing-machine cotton bobbins to wind new coils on.  While they're not easily tuneable, we don't have access to a reference playback tape to align them with, nor a spectrum analyser, to do a proper alignment, anyway, but they do the job respectably well.



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