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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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<blockquote data-quote="handsome" data-source="post: 830153" data-attributes="member: 772"><p>Look carefully at your rectifier data. Valve rectifiers have a maximum capacitance and a minimum anode resistance that they must see depending on the amount of voltage/current that they will be fed (60uF and 100R for a 5AR4 at 350-0-350V). The 90R resistor in your power supply is no doubt that resistor (the resistance can be connected either to the plates or the cathode of the rectifier). If your first capacitor is too large/resistance too small you may damage the rectifier. there are no limitations on the size of the capacitor after the choke.</p><p></p><p>http://www.triodeel.com/5ar4_p1.gif</p><p></p><p>The phase splitter balancing pots are a nice touch but you would probably be better off using a pair of matched 1% 82k resistors of as higher wattage as you can find (the resistors' value will drift with heat higher wattage types tend to be more stable). Also your fist stage has an unbypassed cathode resistor - this would imply designer was using a valve with more gain than necessary.....l</p></blockquote><p></p>
[QUOTE="handsome, post: 830153, member: 772"] Look carefully at your rectifier data. Valve rectifiers have a maximum capacitance and a minimum anode resistance that they must see depending on the amount of voltage/current that they will be fed (60uF and 100R for a 5AR4 at 350-0-350V). The 90R resistor in your power supply is no doubt that resistor (the resistance can be connected either to the plates or the cathode of the rectifier). If your first capacitor is too large/resistance too small you may damage the rectifier. there are no limitations on the size of the capacitor after the choke. http://www.triodeel.com/5ar4_p1.gif The phase splitter balancing pots are a nice touch but you would probably be better off using a pair of matched 1% 82k resistors of as higher wattage as you can find (the resistors' value will drift with heat higher wattage types tend to be more stable). Also your fist stage has an unbypassed cathode resistor - this would imply designer was using a valve with more gain than necessary.....l [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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