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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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<blockquote data-quote="fredeb" data-source="post: 947256" data-attributes="member: 13623"><p>Wow ! I looked at the 6GK5 datasheet , very low Rp (5k4) with a gain of almost 80 , quite suitable as the first valve .</p><p></p><p><a href="http://www.r-type.org/pdfs/6gk5.pdf" target="_blank">http://www.r-type.org/pdfs/6gk5.pdf</a></p><p></p><p>That said , I have to use valves I have in stock , not being fiscally capable of purchasing more ATM , will have to wait until I'm employed again - the SA film industry being the fickle thing that it is . :whistler:</p><p></p><p></p><p></p><p></p><p>Thank you for mentioning that Ampdog , I have been reading up a bit about Johnson noise on diyaudio.com , much to learn yet .</p><p></p><p><a href="https://www.diyaudio.com/forums/tubes-valves/342631-grid-stopper-resistor-question.html" target="_blank">https://www.diyaudio.com/forums/tubes-valves/342631-grid-stopper-resistor-question.html</a> Some interesting input here .</p><p></p><p></p><p></p><p></p><p>Yes , because I ordered my transformer so hastily ( 200V @ 200mA + 6.3V @ 3A , it arrived right now ) I can't use the LM317 regulators ( should've been 9V ) , so I have been considering zener regulation , or plain CRC regulation .</p><p></p><p></p><p></p><p></p><p>That sounds highly educational and very interesting . </p><p></p><p>Have you started on your 2nd and 3rd Hall?'s ?</p></blockquote><p></p>
[QUOTE="fredeb, post: 947256, member: 13623"] Wow ! I looked at the 6GK5 datasheet , very low Rp (5k4) with a gain of almost 80 , quite suitable as the first valve . [url=http://www.r-type.org/pdfs/6gk5.pdf]http://www.r-type.org/pdfs/6gk5.pdf[/url] That said , I have to use valves I have in stock , not being fiscally capable of purchasing more ATM , will have to wait until I'm employed again - the SA film industry being the fickle thing that it is . :whistler: Thank you for mentioning that Ampdog , I have been reading up a bit about Johnson noise on diyaudio.com , much to learn yet . [url=https://www.diyaudio.com/forums/tubes-valves/342631-grid-stopper-resistor-question.html]https://www.diyaudio.com/forums/tubes-valves/342631-grid-stopper-resistor-question.html[/url] Some interesting input here . Yes , because I ordered my transformer so hastily ( 200V @ 200mA + 6.3V @ 3A , it arrived right now ) I can't use the LM317 regulators ( should've been 9V ) , so I have been considering zener regulation , or plain CRC regulation . That sounds highly educational and very interesting . Have you started on your 2nd and 3rd Hall?'s ? [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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