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Old 10th April 2005, 04:04 PM   #1
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Join Date: Aug 2002
Location: Cascais
Default Tron Syren

The 6moon review contains some truly inspirational pics. It's obviously a compromise to squeese everything in a single box, but a compromise i seem more and more willing to accept. Yeah, old age.

It seems like a fairly strightforward design to clone, both elecrically and mechanically. The input seems to feed a Lundahl 9206 step-up with some jumpers to set gain. Interesting that a modest transformer like this is good enough for such an expensive design. Then there is a bog standard looking 1/2 ECC83 feeding a passive RIAA. Lots of elecrtrolytics around, seems like cathode resistors are bypassed and the elcos - skinned. Another 1/2 ECC83.

Now looking from the back the output jacks seem to tap to another Lundahl, possibly a 1660 hooked as step-down and driven by 1/2 5687. Things get a bit less clear around the volume pot. Are the other two similar looking pieces of Lundahl iron also transformers? Is the volume pot being fed by another step-down? Or are they merely power supply chokes?

Any ideas? Anyone willing to take a peek under the hood of their Syren?
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Old 11th April 2005, 04:28 AM   #2
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Join Date: Oct 2004
Location: Adelaide South Oz
A quick note on the "skinning" of the electrolytics. The enemy of electrolytics is heat. Pulling off the "skin" is a great idea for extending the life of electrolytics. I have seen this mentioned on at least one electrolytic manufacturers website - they claimed it was equivalent to 25 degrees C increase in temperature rating.
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Old 13th April 2005, 09:05 AM   #3
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OK, i understand the owners' reluctance to peek inside their Syrens

Nobody would venture a guess what the second set of transformers is for?
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