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Question about recapping a Dynaco ST70
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Posted on July 10, 2014 at 13:13:47 | ||
Posts: 2957
Location: N. Carolina Joined: February 16, 2004 Contributor Since: December 3, 2015 |
I'm recapping an original Dyna ST70, it has never had any work done previously. I obtained an exact replacement for the quad filter cap. It is 30/20/20/20uF @ 525VDC. The original is wired with the 30uF section directly to the 5AR4 rectifier tube, then after the choke is 20uF, which is the point feeding the finals. My question: would it make sense to use 20uF at the rectifier tube, then 30uF after the choke? I have seen data regarding the maximum amount of capacitance on a 5AR4, but can't put my hands on it now. It seems less capacitance on the rectifier tube might increase reliability. Any comments? Thx, Al |
Try this..., posted on July 12, 2014 at 05:24:11 | |
Posts: 12323
Location: SE MI Joined: September 6, 2001 |
...a long thread but worth a read. Interesting conclusions about the stock circuit of the amp. |
RE: Try this..., posted on July 12, 2014 at 07:05:53 | |
Posts: 527
Location: Texas Joined: December 21, 2002 |
Thanks, Steve. I appreciate you. |