5R4 and 5U4 solid state replacement on an Apache or Marauder

[Bob Burns]

Hi Pat
 
I would check the ratings of the electrolytic caps as you are going to get  
a higher inrush current when you switch on. Although the directly heated  
rectifiers warm up fairly quickly (2-3 seconds) they do provide some limit to 
 the switch on surge whereas the semiconductor diodes will charge the 
capacitors  instantly and the only significant current limit is the inherent 
resistance in  the main transformer.
 
With no load, the voltage on the smoothing caps will be 1.414 times the AC  
supplied to the diodes. Otherwise it should be fine and you will benefit 
from  the reduced amount of heat.
 
73

Bob 

G3OOU
G-QRP  6907
Joint site with Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
My technical site: _http://www.qsl.net/g3oou/_ (http://www.qsl.net/g3oou/) 

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTS.TEMPE.GOV
Archives - http://lists.tempe.gov/archives/HEATH.html