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-   -   Simple SE using pwr trans without ct (http://www.diyaudio.com/forums/tubelab/189562-simple-se-using-pwr-trans-without-ct.html)

stoolpigeon 24th May 2011 05:07 AM

Simple SE using pwr trans without ct
 
Have looked through my collection of power transformers and none have a centre tapped high voltage winding. Just to get it going to see if it suits my speakers I am wondering if I can use a bridge rectifier arranged as either:

1. a hybrid using the tube rectifier plus the 2 diodes on the pcb but fitted in reverse with the other end of the diodes (which go to connection SW1) linked to gnd at the connection for the centre tap. This is a very short link on the pcb.

2. all diodes external to the pcb with B+ tapped into the junction of R1 and C2 and gnd to the connection for the centre tap.

In both cases the heater connections would be untouched.

Here is the schematic:
Simple SE schematic

Please tell me if this is dangerous!!!!!
Thanks, sp

Ian444 24th May 2011 10:00 AM

Option 1 should work fine. I would go with that for sure.

Edit: Just be careful how high the resulting voltage B+ may be, B+ is usually close to volts AC x 1.28 under load, minus the drop of the 5AR4, maybe 10 or 20V at a guess.


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