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Old 2nd Jul 2020, 4:59 pm   #4
bikerhifinut
Octode
 
Join Date: Nov 2013
Location: Penrith, Cumbria, UK
Posts: 1,993
Default Re: Rogers Ravensbrook series2 amp. Before attempting a capacitor replacement.

Thanks.
The point about the reservoir capacitor is that as a youth I tried a larger value when I fixed the original PSU fault when the pass transistor packed in under an accidental overload condition, The 1A protection fuse wasn't fast enough.
All I got was a boomy overblown bass and a tendency to blow the fuse when the wick was turned up not much above a moderate level on transients I guess due to larger reservoirs ability to deliver instantaneous current for a short period of time.
So I have stuck with 1000uF as per the original design. everything else so far has been as near as I can get to the originals in modern preferred values.
I only wondered about the speaker output coupling caps because I was a bit concerned but I imagine if they are dried up a bit, and I did discover a couple of bulging caps, then they'd go high on the ESR and likely not present as low a load. More a worry if they go S/C?
Andy.
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