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?
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?
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.
Cheers,
Ian
Cheers,
Ian
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