The schematics of the real EC 25W amplifiers                                         

is shown below, taken from a service manual, and by full acceptance from Per Abrahamsen of Electrocompaniet.  Again (since you've probably went directly here) - he approved and even supported the idea of making these schematics public through this site, in order to cover the history of Electrocompaniet. 

Note that the schematic layout is very equal to the original, except for the changes to the compensation networks. (Look at the emitters on the differential voltage amplification pairs.)  The major changes can be found by looking at the component lists, which comes here, and which applies for applifiers with serial numbers below 275.  The component list for serial numbers above 275 is covered in an addendum here. You must then use both lists and crosscheck to get the full picture.

(PS: I know this scanning is lousy - a better one will come up in a while.....)

Component lists for serial numbers above 275, the Great Change:

So - this covers it.  No further change was done to these amplifiers.  Well, not quite true - I did some further modifications after I left Electrocompaniet.  You can read about them here - of course also with schematics. (Links will appear later)

I'm not quite sure how many amplifiers were made, but by mid 77, we had reached serial no 275, that took 2 years to reach.  From then I believe approx. 50 units were manufactured each month, until approx. 1981-82, when Electrocompaniet introduced the Ampliwire series which replaced the 25W amplifier.  This means there could be some 2000 amplifiers around.  Perhaps Per knows more - I'll make sure to ask him the next time. 

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