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Re: Schematic updated. [message #11449 is a reply to message #11445] |
Thu, 15 January 2009 12:05 |
Shane
Messages: 1117 Registered: May 2009
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Illuminati (3rd Degree) |
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Wayne, let me run it a while and work through any bugs. One thing is, this amp was built with mainly donated parts, so it could done in a better way I think.
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Re: 1st Scratch Build Done. [message #11453 is a reply to message #11438] |
Thu, 26 February 2009 00:25 |
Norbert
Messages: 42 Registered: May 2009
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Baron |
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Shane, I thoroughly enjoyed viewing your build. I recently build a 300B SET based on "Legacy" C3M penthode input stage. Couple of suggestions you may want to look into to improve the sound. 1] add ultrapath stage. The best source to find out more is from www.tubecad.com site 2] not sure if heard any arching from your power switch when turning it on/off,if that is the case consider adding 0.1uF@400V+ film cap across the switch 3] experiment with 2uF film cap across both cathode caps Cheers, Norbert
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Re: 1st Scratch Build Done. [message #11454 is a reply to message #11453] |
Mon, 09 March 2009 01:05 |
Shane
Messages: 1117 Registered: May 2009
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Illuminati (3rd Degree) |
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Thanks Norbert. I tried adding a 0.1uF/1000V disk cap across the switch and ended up getting voltage on the amp. I tried two seperate switches and two seperate caps and every combo gave me this. So I have just been turning the amp off when playing and that seems to take care of it. With the bleeder I have it drops the volume to nil in about 5 seconds and no popping.
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Re: 1st Scratch Build Done. [message #11455 is a reply to message #11454] |
Mon, 09 March 2009 01:30 |
Norbert
Messages: 42 Registered: May 2009
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Baron |
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Hello Shane, It sounds like the wrong caps you used. Disk caps won't do it, I am using this cap from digikey: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=495-3232-ND You can get it from other places. My cap has been working for over three months now and I listen to my amp 6 days a week.
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Re: 1st Scratch Build Done. [message #11456 is a reply to message #11455] |
Wed, 11 March 2009 00:38 |
Shane
Messages: 1117 Registered: May 2009
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Illuminati (3rd Degree) |
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Thanks Norbert. I may give those a try. I was just using what was recommended to me on another forum. It definitely didn't work as with the switch off I ws getting full voltage on the PT primary.
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