VR-1000 (1956) (VRX-1000) FM Low band, three racks of tubes, monochrome.
No timebase correction.

VR-1000 "Allen" or "Allenized" update kits (made for Ampex by Steve Allen at Allen Electronics) to color solid state, FM high band updateable, solid state servo system.

VR-1001  VR-1000 with the transport vertical.

VR-2000 (1964) Solid state, first color-capable quad VTR with high band.
Optional Editec, Dropout compensation.
Mark 10 head.
Analog TBC.

VR-1100E (1966) Solid-state VR-1000.

VR-1195 (1966) VR1100 with many Ampex updates.

VR-1200 (1966) Solid state, color high-band.
Analog TBC.
Optional Editec.
 Scaled-down economy version of the VR-2000.

VR-3000 (1967) Portable VTR with a Mark 11 ball-bearing head.
All-format VTR (NTSC/PAL/SECAM, 15 IPS/7.5 IPS, high-band/low-band).
Digital TBC was possible, but required extensive mechanical modifications to the basic unit.
Battery- or line-powered.

VR-3000B Portable VTR Improved version of VR-3000.
Digital TBC was available as a plug-in accessory, and required no modifications to the basic unit.
Improved batteries.

AVR-1 (1973) Very fast VTR, vacuum columns, vacuum capstan, air transport.
NTSC/PAL switchable.
Analog TBC.

ACR-25 (1974) Cart VTR, with two AVR-1 type decks.

ACR-25B (1975) Cart VTR, ACR-25 with AVR-2 digital TBC.

AVR-2 (1974) Digital TBC, compact Quad used in studios and remote trucks.
Uses 110-volt single-phase AC (other quad models require 220-volt or 3-phase AC service, although the AVR-2 can be wired for either 110- or 220-volt service).

AVR-3 (1975) Last Ampex Quad, digital TBC.
Vacuum capstan.
Super high band.

The VR-2000 & VR-1200 (and the VR-1100E & VR-1195, as well as some updated VR-1000 VTRs) used modules to correct the playback time base errors of the videotape.
The list of modules are:
Amtec: Horizontal TBC.
All that was needed for B&W playback.

Colortec: Color TBC in line after the Amtec for color playback.

Editec: (1963) Cue tone editor for frame accurate editing.

Velcomp: Color velocity TBC correction for better color playback.
Optional on some models.

Procamp: Processing amplifier on the final output.
New composite sync insertion, level adjustment.
Note: all quad VTRs have a procamp so as to obtain a standardized output from a recording.
Ampex procamps were occasionally used to clean-up, hence to standardize network feeds.

Dropout compensation (DOC): Replaced snowy video spots where the FM signal on the tape is missing momentarily, caused by a defect or dust particles on the tape.
Optional on some models, both Ampex and 3M made different models of DOC modules for quad VTRs that can interface with such.

The components of the VTR were the servo system, video record (modulator) and playback de-modulator) and power supply.
VR-1000 (1956) (VRX-1000) FM Low band, three racks of tubes, monochrome. No timebase correction.
VR-1000 "Allen" or "Allenized" update kits (made for Ampex by Steve Allen at Allen Electronics) to color solid state, FM high band updateable, solid state servo system.
VR-1001  VR-1000 with the transport vertical.
VR-2000 (1964) Solid state, first color-capable quad VTR with high band. Optional Editec, Dropout compensation. Mark 10 head. Analog TBC.
VR-1100E (1966) Solid-state VR-1000.
VR-1195 (1966) VR1100 with many Ampex updates.
VR-1200 (1966) Solid state, color high-band. Analog TBC. Optional Editec.  Scaled-down economy version of the VR-2000.
VR-3000 (1967) Portable VTR with a Mark 11 ball-bearing head. All-format VTR (NTSC/PAL/SECAM, 15 IPS/7.5 IPS, high-band/low-band). Digital TBC was possible, but required extensive mechanical modifications to the basic unit. Battery- or line-powered.
VR-3000B Portable VTR Improved version of VR-3000. Digital TBC was available as a plug-in accessory, and required no modifications to the basic unit. Improved batteries.
AVR-1 (1973) Very fast VTR, vacuum columns, vacuum capstan, air transport. NTSC/PAL switchable. Analog TBC.
ACR-25 (1974) Cart VTR, with two AVR-1 type decks.
ACR-25B (1975) Cart VTR, ACR-25 with AVR-2 digital TBC.
AVR-2 (1974) Digital TBC, compact Quad used in studios and remote trucks. Uses 110-volt single-phase AC (other quad models require 220-volt or 3-phase AC service, although the AVR-2 can be wired for either 110- or 220-volt service).
AVR-3 (1975) Last Ampex Quad, digital TBC. Vacuum capstan. Super high band.
The VR-2000 & VR-1200 (and the VR-1100E & VR-1195, as well as some updated VR-1000 VTRs) used modules to correct the playback time base errors of the videotape. The list of modules are:
Amtec: Horizontal TBC. All that was needed for B&W playback.
Colortec: Color TBC in line after the Amtec for color playback.
Editec: (1963) Cue tone editor for frame accurate editing.
Velcomp: Color velocity TBC correction for better color playback. Optional on some models.
Procamp: Processing amplifier on the final output. New composite sync insertion, level adjustment. Note: all quad VTRs have a procamp so as to obtain a standardized output from a recording. Ampex procamps were occasionally used to clean-up, hence to standardize network feeds.
Dropout compensation (DOC): Replaced snowy video spots where the FM signal on the tape is missing momentarily, caused by a defect or dust particles on the tape. Optional on some models, both Ampex and 3M made different models of DOC modules for quad VTRs that can interface with such.
The components of the VTR were the servo system, video record (modulator) and playback de-modulator) and power supply.
Quadruplex videotape