Quad II question: High B+ a problem?
On Friday, 11 April 2014 22:24:26 UTC+10, wrote:
Hello all, long time lurker/sporadic poster here with a question concerning my current project.
I recently rebuilt a couple of Quad II's from what was pretty bad shape with parts missing etc. Everything now works and sounds great and even looks mostly original... except for the highish B+ Im getting. This is the new configuration:
Rectifier tube (5AR4) - 33uF/450v - the original choke - 47uF/450v
I am not sure you know what you are doing. The original greay potted choke in Quad-II is to filter the screen supply. It does not filter the anode supply to the OPT CT.
If you wish to use the existing Quad-II choke to CLC filter the B+ at OPT CT then you might see a huge reduction in B+ because that choke has Rw = 600r.
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