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Audio and Video Talk
Valves / Vacuum Tubes
Current limiting resistor for valve rectifier
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<blockquote data-quote="marantz123" data-source="post: 880046" data-attributes="member: 16849"><p>The diode mod on the GZ34 is a great idea because the PIV rating of newer GZ34 is not as high (in practice) as the old stock which lasted much longer in service. When the PIV rating is exceeded, the dreaded flashover occurs which damages the valve. The diodes 1N4007 can handle a PIV of 1000v and handle that stress, allowing the valve relief of that task, hence protecting it and allowing it to carry out the task of bringing up the B+ slowly. Extends life of the GZ34. Old Mullards do well without, but newer Sov and Chinese valves benefit frm this mod. Sitting with a sparkling new Sov that flashed over with its previous owner.</p></blockquote><p></p>
[QUOTE="marantz123, post: 880046, member: 16849"] The diode mod on the GZ34 is a great idea because the PIV rating of newer GZ34 is not as high (in practice) as the old stock which lasted much longer in service. When the PIV rating is exceeded, the dreaded flashover occurs which damages the valve. The diodes 1N4007 can handle a PIV of 1000v and handle that stress, allowing the valve relief of that task, hence protecting it and allowing it to carry out the task of bringing up the B+ slowly. Extends life of the GZ34. Old Mullards do well without, but newer Sov and Chinese valves benefit frm this mod. Sitting with a sparkling new Sov that flashed over with its previous owner. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Current limiting resistor for valve rectifier
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