Finding schematics for your Dan Armstrong product can either be relatively simple, or extremely difficult as some drawings are fairly common while others are exceedingly rare. Even then, trying to find the right parts or components so many years later can be problematic at best. Nobody understands this better than Chuck Wojack of Grafton Electronics, maker of the reissue Dan Armstrong effects units at for when I interviewed him about recreating Dan's effects units he stated "The most difficult challenge was finding components that would closely match the specifications of the original components made back then."

When I asked him about schematics of all the Dan Armstrong effects units that are available on the Internet, he went on to add "The problem with all the schematics on the Internet and everywhere is that some are just plain incorrect, and the ones that are correct reveal components that either are not available any longer - or if they are the specs of the component have changed and are now different than what they were back then, and if the specs of the actual component have not changed - the manufacturing process in the way the component is now made..... has."

The bottom line is - although the following schematics show the components in the various Dan Armstrong products it is wise to keep in mind that components have changed over the years and may not perform as good, or exactly like the original. As such, the end result may be different than what is expected, or how things may have sounded in the late 1960's through the 1970's. It's just something to keep in mind while repairs are underway.

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photo courtesy of Bill Richardson

As seen above, one of the earliest, and easiest schematics to find actually came with the Dan Armstrong Instruments. The drawings are actually on the back page of the Dan Armstrong · Ampeg owners manual and reveal the wiring diagram of both the guitar and bass. However, these drawings are for the 1969 and early 1970 models. For more recent models it is suggested to first read through the hardware section of this site, and/or visit the Unofficial Ampeg Page where a PDF file is available for download in the schematic section depicting new changes in the wiring schemes for the Dan Armstrong · Ampeg instruments dated March 8, 1971.

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click to enlarge

Above left, the schematics of the pre-amp section can be seen while the enlarged view shows the individual components. According to Dan, the pre-amp section of the Dan Armstrong amplifiers are identical, and only the power amp stages being the only thing that differentiates the models. More about it can be read in the amps section.

At upper right, and seen better in enlarged view, the schematics of the Dan1 amplifier - which is a 30 watt RMS guitar amplifier which can be seen in the amps section.

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click to enlarge

At upper left, schematics for the Dan2&3 amplifiers which are 60 watt amplifiers with the Dan2 being a combo type amp that has 2 12" speakers. The Dan3 is the same type of head, but only the piggyback head itself. Both of these amps can be seen in the amps section, while at the enlarged view here will depict the internal components.

At upper right are the schematics for the Dan4 piggyback head which is a 100 watt amp head, with the internal components better seen in the enlarged view. Unfortunately, at this time I do not have any drawings for the 200 watt RMS Dan5 amp head. All the above drawings are available as a PDF file and can be seen by left clicking or downloaded by right clicking here.


Names and images are TMand Dan Armstrong / Ampeg. All rights reserved.
All other names and images are TMand of their respective owners. All rights reserved.