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RE: Ping Mike Samra - re film PSU caps for LEAK amps

Posted by Michael Samra (D) on August 19, 2016 at 00:41:55

In Reply to: Ping Mike Samra - re film PSU caps for LEAK amps posted by Timbo in Oz on August 19, 2016 at 00:06:12:

Tim
If you decide you use film caps,they won't be anywhere near the 470uf in value..You would only need a 50uf off the GZ34 rectifier and after a choke if you decide to use one you can put a 60uf after the choke or the resistor if you don't have a choke. The original capacitance in those amps are a pair of dual 32uf..For the other two section cap just use a pair of 50uf films..I'm giving you these values because I know they will physically fit and sound awesome,
Your 470uf caps won't hurt the power transformer because but, unless you use diodes in place of the rectifier tube,you can mess up a GZ34.

One more thing? I believe there's CL thermistor in the primary to the PTs - in both amps. Is there value in having another one on the 'HT' or 'B plus' secondary, so as to give heating a bit more time? It won't hurt but if you are using a GZ34,it isn't really necessary..I would be using Schotky diodes instead of the GZ34 as they are so quiet and have no switching noise or ugly spikes at turn on.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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Edits: 08/19/16 08/19/16

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