Analog Delay

"Vintage analog delays for vintage analog delay fans"



The GT Analog Delay rack effect module has numerous configuration options that compare to several of the best analog BBD delay pedals that were ever built.  After looking at loads and loads of old analog delays, we realized that many of them have very similar designs.  So we generalized elements of those design, made them modular, and built our boards to offer not only those great vintage circuits but loads of customized "vintage analog BBD delays that never existed".  You pick and choose how you want the modules.  It's sort of a geek nirvana module for analog delay lovers.



The Analog Delay isn't really a module, it is more like a collection of modules.  Many of the vintage analog delays have circuits that are very similar.  Since we have room in our rack module format, we broke those circuits down into their common parts so that we could build them with interchangeable boards and assemble a wide variety of different circuits.  There are three sections of these vintage circuits that are split onto different boards.  The first is the primary audio section.  This section contains all of the audio signal processing except for the portion that is responsible for adding the delay to the signal.  The second section is the delay section, where the BBD delay ICs and their support components are found.  Finally there is the clock section.  The clock section does not process the audio signal.  It is responsible for controlling the delay.  Building the Analog Delay this way enables a more manageable approach to building a wide variety of analog delay circuits.  It also enables a level of customization that might more appropriately be called "analog delay design".  If you want to tweak something about one of those old circuits, we can accommodate a good variety of requests.  But we can also swap out entire sections of the circuits to create circuits that never existed.  For example, perhaps you like your Boss DM-3, but wish it had a longer delay like a EHX Deluxe Memory Man.  No problem - we switch out the usual Boss DM-3 delay and clock sections and swap in some different ones and we're there.

There's a downside to this approach.  We don't know what you want in your custom design!  We offer a number of known circuit configurations, described below.  The best way to end up with a custom design is to start with whichever base configuration is closest to what you want, and use options to change that configuration to your custom design.  Of course, we're happy to help you configure the delay you want, the way you want it. 

All configurations will be built with individually hand-selected BBDs, properly adjusted to the point we consider "the longest maximum delay with the best sound" for those specific BBDs.  We are forced to reflect in our pricing the increasing cost and decreasing availability of most BBD chips.  It is very difficult to source the vintage chips, with counterfeits and poor-performing used or seconds outnumbering the real ones.  We do what we can to keep these costs at a minimum, but that is largely out of our control.  Occasionally we run out of specific BBDs, so there may be delays if we have trouble finding more.  We try to stay ahead of demand, though.  It is possible that your module cost may be lower, depending on the specific BBDs you choose.  Prices may fluctuate from time to time with market prices of the BBDs, but once you place your order your price is locked in and will not increase.




Option/Feature AD-10 AD-80 AD-9A AD-9B AD-900 AD-99 AD-DMM AD-XO AD-4005 ADM-2 ADM-2W ADM-3
Compares To Ibanez CD-10 Delay Champ Ibanez AD-80 Delay Ibanez AD-9 Delay ver. A (1) Ibanez AD-9B Delay (2) Ibanez AD-900 Delay Ibanez AD-99 Delay EHX Deluxe Memory Man EHX Deluxe Memory Man XO EHX Deluxe Memory Man 4005 (3) Boss DM-2 Delay Boss DM-2W Delay Boss DM-3
Controls Delay, Repeats, Mix Delay, Repeats, Mix Delay, Repeats, Mix Delay, Repeats, Mix Delay, Repeats, Mix Delay, Repeats, Mix Level, Blend, Modulation, Feedback, Delay, Chorus/Vibrato Level, Blend, Modulation, Feedback, Delay, Chorus/Vibrato Level, Blend, Modulation, Feedback, Delay, Chorus/Vibrato Delay, Repeats, Mix Delay, Repeats, Mix, Short/Long Delay, Repeats, Mix
Mix Type 50/50 0/100 50/50 50/50 50/50 50/50 0/100 0/100 0/100 50/50 50/50 50/50
# BBDs 1 1 1 1 2 1 2 4 4 1 3 1
BBD MN3205 MN3005 MN3205 MN3205 MN3005 MN3205 MN3005 MN3008 MN3005 MN3005 MN3005 MN3205
Voltage +9V +15V +9V +9V +15V +9V -15V -15V -15V +15V +15V +9V
Loop option option option option option option option option option option option option
Short Delay Option n/a n/a n/a n/a option n/a option option option n/a included n/a
Buffers input no input input input input no no no input input input
Power Consumption 20 - 25mA 35 - 40mA 25 - 30mA 25 - 30mA 50 - 55mA 25 - 30mA 95 - 105mA 95 - 105mA 95 - 105mA 40 - 45mA 40 - 45mA 20 - 25mA


Configuration Notes

  • Ibanez AD-9A, AD-9B - There were two versions of the Ibanez AD-9.  They aren't marked in any way we are aware of to distinguish between them.  There are quite a number of small differences.  We'll use their R9 resistor to map to our arbitrary A/B designation.  If R9 is 47K, that is our "A" version.  If it is 10K, that is our "B" version.
  • EHX Deluxe Memory Man (different versions) - As MN3005 chips became unavailable, the Deluxe Memory Man was built in several versions, with different numbers and types of BBDs and with different features (eg Tap Tempo) in some of the more advanced models.  We picked the more desirable configs as "standard", and even introduced a non-existent model 4005.  The 4005 configuration has a BBD config like the more advanced model 1100, but it doesn't have all those features. Presently these are the only configurations that include modulation and input level control.
  • Loop - The loop option lets you insert another effect into the wet side of blend/mix.  It requires 2 extra jacks, which requires the module to be 2" wide.  At the moment we only support this config in non-wing modules, but that may change by the time you order, so definitely ask if that matters to you.  The board space is tight, so the two extra jacks are wired together on a single connector.  If one jack goes out, you can either replace it with some trivial soldering, or you can get the whole cable assembly with both jacks as a replacement part.  You must connect the Send and Return jacks with some other effect or a patch cable or you won't get any delay signal.  We can probably make the loop switchable on the front panel for a small additional charge - just ask if you need that.
  • ADM-2, ADM-3 - Boss had some "transition" circuits that had the two types of BBDs swapped.  We picked the "main" version for each.
  • Custom Designs - Choose one of the standard configurations to select the primary audio portion of the circuit.  That portion of the circuit contains most of the tone shaping of the delay, and can be tweaked if you have a specific schematic or change that you need.  You may choose from 1 to 4 BBDs, from among the BBDs we support (see Custom BBDs note below).  When you select the BBDs, we will select the clock circuit configuration that will work with your BBD selection.  The Options below are also available for custom designs.



  • Custom Delay - Select this option to capture your custom delay requirements that aren't covered by other options.
  • Custom BBDs - Change the number and/or type of BBDs used in the configuration.  May also result in a voltage change.  See much more info about Bucket Brigade Delay ICs (BBDs).  Causes Short Delay Option to become an option for that configuration if the number of BBDs is increased.
  • Loop - Add an external loop where all the repeats are sent before they are processed and delayed.  Must cable from Send to Return.
  • Change Mix Control - There are two types of Mix Controls.  One we refer to as the 50/50 control.  It allows you to adjust the level of repeats from 0 to 50%.  The other we call the 0/100 control.  It lets you mix the level of repeats from 0 to 100%.
  • Short Delay Switch - This is a switch that allows you to skip some of the BBDs in your delay section.  This allows for cleaner short delays.  Not an option for single BBD configurations.  If there are 2 or 3 BBDs the signal comes out after the first one.  If there are 4 BBDs the signal comes out after the second one.
  • Voltage - This isn't usually a recommended option.  There is a voltage that provides "best" sound for each type of BBD.  We use that voltage by default.  For BBDs that would normally be run at 15V, you can select a lower voltage (as Boss did on one model of delay), but we do not recommend it (not even on that Boss circuit).
  • Custom Components - There is a considerable variety of component types in analog BBD beyond the normal assortment of resistors, capacitors, diodes, transistors, and op amps.  All those are present, but there may also be companders, clock chips, and other assorted ICs.  We use the ones that are the same as the original circuit for these "extra" component types.  The normal components are chosen for tone and low noise.  If you have specific requests for any of the components, let us know.


Front Panel

  • Delay - adjust the amount of time between repeats
  • Repeats/Feedback - adjust the number of repeats
  • Mix/Blend - adjust the ratio of wet and dry signal
  • (DMM, XO, 4005 configurations) Level - reduce the input level to prevent clipping/distortion
  • (DMM, XO, 4005 configurations) Modulation
  • (optional) Short/Long Delay switch
  • (optional) Buffer switch


Rear Panel

  • Audio In
  • Audio Out
  • On/Off Footswitch
  • On/Off Override
  • DC Power
  • DC Power LED
  • (optional) Loop Send
  • (optional) Loop Return


Module Width

  • 1.5" standard for most configurations, 2" standard for DMM, XO, and 4005 configurations
  • 2" with options, possibly 3"
  • 2" left wing available for standard (3-4) control configurations, not presently available for DMM, XO, or 4005 configurations.
  • 1.5" right wing available for standard (3-4) control configuration, not presently available for DMM, XO, or 4005 configurations.
  • configurations with loops are 2", loop configurations are not presently available for left or right wing positions.


Power Consumption (aprox)

see chart above


Base Configurations

Part # Description List Price
MOD-AD10 AD-10 Analog Delay module $239
MOD-AD80 AD-80 Analog Delay module $239
MOD-AD9A AD-9A Analog Delay module $239
MOD-AD9B AD-9B Analog Delay module $239
MOD-AD900 AD-900 Analog Delay module $259
MOD-AD99 AD-99 Analog Delay module $239
MOD-ADDMM AD-DMM Analog Delay module $279
MOD-ADXO AD-XO Analog Delay module $299
MOD-AD4005 AD-4005 Analog Delay module $299
MOD-ADM2 ADM-2 Analog Delay module $239
MOD-ADM2W ADM-2W Analog Delay module $299
MOD-ADM3 ADM-3 Analog Delay module $239



Part # Description List Price
MOPT-AD-CUST Custom Delay Configuration TBD
MOPT-AD-MIX Change Mix Control Type $0
MOPT-AD-SHDEL Short Delay Switch $19
MOPT-AD-VOLT Custom Voltage $0
MOPT-AD-CC Custom Components TBD



Part # Description List Price
MPT-AD-CA Replacement pot, switch, jack, LED cable assembly $19
MPT-AD-LA Replacement loop jacks cable assembly $29
MPT-AD-KNB Replacement control knob $2
MPT-AD-PB Replacement power board $29
MPT-AD-SB Replacement switching board $29