Home » Audio » Thermionic Emissions » 1st Scratch Build Done.
You've got mail! [message #11448 is a reply to message #11447] Wed, 14 January 2009 22:11 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18716
Registered: January 2001
Illuminati (33rd Degree)

I sent a message about LSAF, so watch for it. Let's talk more this weekend.


Re: Schematic updated. [message #11449 is a reply to message #11445] Thu, 15 January 2009 12:05 Go to previous messageGo to next message
Shane is currently offline  Shane
Messages: 1117
Registered: May 2009
Illuminati (3rd Degree)
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.

Re: Schematic updated. [message #11450 is a reply to message #11449] Thu, 15 January 2009 13:15 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18716
Registered: January 2001
Illuminati (33rd Degree)

Sounds good. Please keep us posted!


Re: 1st Scratch Build Done. [message #11451 is a reply to message #11438] Wed, 04 February 2009 21:15 Go to previous messageGo to next message
SteveBrown is currently offline  SteveBrown
Messages: 330
Registered: May 2009
Grand Master
Beautiful! Looks like a great build. Bet it sounds wonderful!

Re: 1st Scratch Build Done. [message #11452 is a reply to message #11451] Thu, 12 February 2009 14:12 Go to previous messageGo to next message
Shane is currently offline  Shane
Messages: 1117
Registered: May 2009
Illuminati (3rd Degree)
Thanks Steve!




Re: 1st Scratch Build Done. [message #11453 is a reply to message #11438] Thu, 26 February 2009 00:25 Go to previous messageGo to next message
Norbert is currently offline  Norbert
Messages: 42
Registered: May 2009
Baron
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

Re: 1st Scratch Build Done. [message #11454 is a reply to message #11453] Mon, 09 March 2009 01:05 Go to previous messageGo to next message
Shane is currently offline  Shane
Messages: 1117
Registered: May 2009
Illuminati (3rd Degree)
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.

Re: 1st Scratch Build Done. [message #11455 is a reply to message #11454] Mon, 09 March 2009 01:30 Go to previous messageGo to next message
Norbert is currently offline  Norbert
Messages: 42
Registered: May 2009
Baron
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.



Re: 1st Scratch Build Done. [message #11456 is a reply to message #11455] Wed, 11 March 2009 00:38 Go to previous message
Shane is currently offline  Shane
Messages: 1117
Registered: May 2009
Illuminati (3rd Degree)
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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