Not only do Tubes look really cool, we think they sound better than their digital counterparts


"Got my old Flanger back today in fine shape. Don't think she has ever sounded like this--in a VERY GOOD way! Thanks for the fine job on the repair! Many thanks for the pro job you do! Take it easy gentleman & thanks so much!!!"















Frequently Asked Questions

  1. What voltages will A/DA Products support?

    A/DA products are manufactured in 100VAC 50/60Hz, 120VAC 50/60Hz, and 240VAC 50Hz and 240VAC 50Hz versions. We ship with the most common plug (cap) for the respective voltages.  North American, EuroPlug and UK Standard plugs are used.  Please contact your local dealer/distributor for the correctly wired version.

  2. What is the warranty on A/DA products?

    All A/DA products are warranted against defects in material and workmanship for a period of one year from date of purchase. A/DA will replace defective parts and make necessary repairs at no charge if factory inspection reveals faulty workmanship or material. This warranty does not cover damage due to misuse, accident or neglect. A/DA retains the exclusive right to make such determination on the basis of factory inspection. Products returned to the factory must be shipped prepaid – we strongly recommend that you work through your dealer to avoid this charge.  This warranty remains valid only if repairs are performed by A/DA or A/DA Authorized Service Center, and provided that the serial number on the unit has not been defaced or removed. This warranty is expressly in lieu of all other warranties either expressed or implied.

  3. What are the modes of operation for the APP-1?

      1. BOOST only
      2. BOOST with the dual buffered FX LOOP
      3. PREAMP + BOOST only
      4. PREAMP + BOOST with the dual buffered FX LOOP
      5. TUNER MUTE - this silences everything except the signal to your tuner, which is plugged into the back panel of the APP-1
      6. TRUE BYPASS (Hardwire bypass)   This also disconnects the TUNER so it won't load your guitar signal.   The signal to the TUNER jack is only present in the IN mode and TUNER MUTE mode, and this signal is buffered.

    By switching the FX LOOP in and out, the user can adjust any gain loss from the effects in he signal chain with the FX LOOP RTN LEVEL pot.   Also when the FX RETURN jack is unplugged, the signal path is normalized, meaning the FX LOOP RTN LEVEL pot is out of the path and the path gain is equal to 1.

  4. The BOOST circuit is post MASTER, so the level of the MASTER is always boosted proportionally up to +16dB of additional gain.

  5. When I play my bass with active pickups through the Final Phase, I lose volume when I hit the distortion button. Is this normal?

    Bass picksups of all types work through the distortion circuit of the Final Phase, but high-gain active pickups may experience a volume loss. If you experience this with a bass with active pickups, the solution is to turn down the volume until there is no volume drop experienced through the distortion circuit.


  1. Do you warranty A/DA products from the 1970’s, 80’s, and 90’s?

    We are very proud that many A/DA products from the 1970s, 80s, and 90s are still out in the world making music.  We also know some of them have stopped working or been damaged, and the warranty on those products are expired.  We have many original parts available for service and we are in the process of setting up Service Centers.  Please contact us at with your product name, serial number, and problem description so that we can best determine how to get your A/DA up and running again.

  2. What are the power requirements for an original (wall-wart) Flanger and Final Phase?

    The Original A/DA Flanger and Final Phase of 1978 through 1979 used an AC adapter. The rating was 18 to 20VDC at a minimum of 50ma. The connector is a 2.5mm x 5.5mm barrel or coax power plug. The polarity of the center pin is positive (+) and the sleeve of the plug is minus (-). The original A/DA part number is 240005. [Please note that the standard for AC adapters has been negative center pin and positive sleeve for the last 25 years. These will not work on the early A/DA stomp boxes.]

    Later in 1980, the A/DA Flanger and Final Phase used and internal power transformer and AC adapters were not used.

    The A/DA MIDI Control Pedals, the MC-1, MPC, MXC and the 4X4 pedals used 5-volt AC adapters or they were powered with our 7-pin MIDI cable that brought power to the pedals through the extra 2 pins of our 7-pin cable. The MIDI standard is a 5-pin cable. The AC adapters for these units had a 2.5mm x 5.5mm plug with the center pin negative (-) and the sleeve positive (+). The rating was 9VDC at 500ma. The US version is our part number 240006, and the European version (230VAC/50Hz) is 240007.