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Yes, quite informative...

Posted by Steve O (A) on March 13, 2007 at 17:00:37

In Reply to: Certainly,.. Try 'Em, You Might Like the Dukes... posted by Interstage Tranny on March 13, 2007 at 07:19:12:

...This type of info is more encouraging. Thanks.

A point of clarification: I don't have anything against corrective feedback as such if properly applied and not used to compensate for marginal open loop performance. I do become concerned when it is applied globally across more than say three stages. In the 475, technically, five stages are involved although the fourth stage is a split load phase inverter with gain <1. The amp also employes the traditional phase compensation network at the output of the second stage so combined with the output snubbers and direct coupling for two of the stages, maybe stability is OK. Hope to find out soon enough.

Regarding age of the 475, the date in title block of the schematic I have is blurry but looks like 2-25-61 or 64. I tend to think the 61 date is correct because I recall seeing a rack of four of these amps in the auditorium of the Jr. High I attended which was built in 61 IIRC.

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