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Amateur 60's? Guitar Amp 
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Joined: Thu Dec 29, 2016 11:17 am
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Hello all,

I picked up this little amp yesterday for a few bucks. I found it in a local amp repair store and thought I could turn it into a first project. I was told that someone had tried to convert to a solid state amp (see photos) and that the tubes had been removed. When I got it home I pulled the chassis out to find that the tubes were still there (and not just any tubes but Telefunken from Germany but I don't know if they work). Now to my question or point, I've been looking everywhere for a schematic or wiring diagram that uses these tubes (ECC83 preamp, 2 ECL86 power amp, EZ81 rectifier) and haven't been able to find anything. Do any of you know of one or have enough knowledge to put one together? I would like to think it a simple project since there is just a volume and tone knob. I don't dare plug it in (would any of you?) by the looks of the wiring. Has anyone ever heard of this brand of amps? Again, I can't find any information on Amateur amps. I'd like to build a nice clean sounding amp. Any comments to point me in the right direction would be GREATLY appreciated. I'm guessing it should be around a 5 watt amp right?


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Thu Dec 29, 2016 11:30 am
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Try http://www.schematicheaven.net for the schematic.

Make sure you know how to drain the filter cap(s) before you do more than a visual inspection. Be safe with tube amps.

As far as this brand, Google turns up nothing except another person looking for info on one of these amps.

http://www.collectorsweekly.com/stories/118778-trying-to-id-this-vintage-guitar-amp-nam


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Personally, I wouldn't connect this to AC power as it is here in this picture. This looks like a fire hazard.

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Thu Dec 29, 2016 12:01 pm
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The ECL86 is 2 tubes in one. It's basically an EL84 power tube with a single 12AX7 triode in the same case. Hammond used them as a space saver in their AO44 reverb amps. There's several conversion schematics floating around the web for those.

One amp circuit that comes to mind which would work with that tube compliment is a Marshall 1930. They used a pair of 12AX7's and a pair of ECL86 tubes. Dump the EZ81 rectifier in favor of diodes to free up some heater current to power an additional 12AX7 and you're good to go. :thu:

Here's one:
http://www.bolimbo.dk/guitarer/forstaer ... opular.htm

There are a few 18W Marshall circuits that used ECL86 tubes and the EZ81 rectifier too:
http://www.drtube.com/library/schematic ... mas#JMP18W


Fri Jan 20, 2017 3:51 am
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Amp in case is a later incarnation Suprem.

These later amps by Suprem doesn´t hold the quality of the earlier builds,like the Club et al,but are nice amps all said and done all the same.

Suprem was a brand based in Lingfeldten (sp) just south of Stuttgart. I´ve had my head into a number of them and their setup is rather..unminstaken.

The Amateur was their entry amp at the time. Mainstay of their production was EL-34 based amps.

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Here an earlier Club Deluxe. A twin EL-34 amp fed by a GZ-34 rectifier. Rather light 112 combo of a mere 14kg.

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I guess you can see the similarity. A Suprem Luxor 40.

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Sun Feb 26, 2017 10:31 am
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