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#1
Posted to rec.audio.tubes
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5z3 rectifier
Hi,
My understanding of tube rectifiers is somewhat limited, and I'm hoping to get some help here. I've seen the basic schematic of a four-pin full-wave tube rectifier depicted at least two ways, and I'm confused. I've seen it this way: http://oldradio.qrz.ru/tubes/foreign/01/5Z3.gif In this configuration, what is done with the center tap of the 5V winding? I've also seen it where the B+ appears to be taken from the center tap of the 5V windings, like http://www.anthemav.com/OldSitev1/pdf/taste.pdf (page 28) Assuming both of these are acceptable, which is preferable and why? Thanks, Lewis |
#2
Posted to rec.audio.tubes
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5z3 rectifier
"Lewis" I've seen the basic schematic of a four-pin full-wave tube rectifier depicted at least two ways, and I'm confused. I've seen it this way: http://oldradio.qrz.ru/tubes/foreign/01/5Z3.gif In this configuration, what is done with the center tap of the 5V winding? ** Huh ?? There ain't one. I've also seen it where the B+ appears to be taken from the center tap of the 5V windings, like http://www.anthemav.com/OldSitev1/pdf/taste.pdf (page 28) Assuming both of these are acceptable, which is preferable and why? ** If there is a heater CT - then use it for the DC out. Supply ripple voltage will be more symmetrical on each half cycle - eliminating any 50 /60 Hz component. ....... Phil |
#3
Posted to rec.audio.tubes
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5z3 rectifier
Phil Allison wrote:
"Lewis" I've seen the basic schematic of a four-pin full-wave tube rectifier depicted at least two ways, and I'm confused. I've seen it this way: http://oldradio.qrz.ru/tubes/foreign/01/5Z3.gif In this configuration, what is done with the center tap of the 5V winding? ** Huh ?? There ain't one. I've also seen it where the B+ appears to be taken from the center tap of the 5V windings, like http://www.anthemav.com/OldSitev1/pdf/taste.pdf (page 28) Assuming both of these are acceptable, which is preferable and why? ** If there is a heater CT - then use it for the DC out. Supply ripple voltage will be more symmetrical on each half cycle - eliminating any 50 /60 Hz component. ...... Phil Thanks, Phil. If I understand you correctly, I should use the second configuration if the transformer has a heater CT. I'm using a Hammond 272JX and it has a 5V 4A center-tapped rectifier section, so I'll plan to take DC from the CT of that section. Lewis |
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