[sdiy] Prophet 5 Rev 3.1 Power Supply -- Heat Disapation

[Fuyuko]

Hello all, 

I recently swapped out a noisy transformer (physical buzzing) on rev3.1 Prophet 5 with same type 36V CT rated at 2.8A.  I measured the old transformer output relative to the CT and the new one and the voltage difference is barely worth mentioning.  After installation, I measured all the voltages and they checked out: +/- 5V, -/+15V, 12V, 22V and so on.  

Because I am monitoring/mothering the unit for the first few days I have really noticed the heat -- I remember it got hot but it feels hot to touch; it stabilises between 45 and 50C at the regulator nut connections on the heatsink.  I think this is normal but want to make sure.  Also, I noted that the 5V regulator output is 5.77V.  I thought I would investigate but I work on one problem at a time.   

Question: Is it running too hot?  

What is best practice on a 5V regulator (7805) at 5.77?  Healthy or in need of closer inspection?

The good, the buzz is gone and the unit plays beautifully. 

Many thanks, 

Bulghur