Home » Audio » Group Build » SE 300B Project, Part 13 - The finished amp
Re: SE 300B Project, Part 13 - The finished amp [message #31919 is a reply to message #31918] |
Mon, 03 July 2006 06:08 |
Damir
Messages: 1005 Registered: May 2009
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Illuminati (2nd Degree) |
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Hey, thanks...I also worked on high temperature and humidity...huh. The whole saturday afternoon and evening I drilled over 300 holes in the lower cover (ventilation)...first fi 3mm, then enlarge them to 4,5mm, then de-burring... This is more tin-smith then electronic work, haha... When I was finished, I mounted the lover cover (tightly), mounted 5 feets (weight!), and bring the amp in the main room. Just listening the music when I have some time - I`m tired of tinkering :-). The sound is very good, little on the "soft and warm" side, but not too much that we can say "colored"... Clean, detailed, very nice! I think that it just started to "open up". Interestingly, two guys with large experience in the amps building privately suggested me 300h burn-in like their experience. They don`t like the forums, I don`t blame them... I measured 5,7 & 6,6 mV of hum on speaker terminals - not overly good, but probably normal for the stereo amp with very small steel chasis. Most of this hum comes from the AC heating, and a little from electromagnetic interactions. Even shorted input grid on 300B doesn`t change the level of hum. Interestingly, one "Svetlana" tube with the hum pot in the middle shows almost 50mV of humm- large "off center"! I needed large turn of hum pot to find the minimum hum. However, the hum isn`t noticeable in the listening position, but people with very sensitive speakers better use bigger chasis of non-magnetic metal, monobloc construction, partitions, and DC heating like reccomendable option. I`ll do some other measurements, when I find some time. And yes - the amp weights exactly 20 kg ...
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SE 300B Project, Part 13 - The finished amp
By: Damir on Mon, 26 June 2006 12:25
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Re: SE 300B Project, Part 13 - The finished amp
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Re: SE 300B Project, Part 13 - The finished amp
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Mon, 03 July 2006 06:08
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Re: SE 300B Project, Part 13 - The finished amp
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Re: SE 300B Project, Part 13 - The finished amp
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Sun, 09 July 2006 13:26
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Mon, 10 July 2006 07:08
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Tue, 11 July 2006 09:23
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Tue, 11 July 2006 10:08
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Tue, 11 July 2006 10:37
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Tue, 11 July 2006 11:33
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Fri, 21 July 2006 04:19
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Fri, 21 July 2006 07:46
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Fri, 21 July 2006 08:38
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Re: SE 300B Project, Part 13 - The finished amp
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Wow! :-)
By: Damir on Fri, 21 July 2006 14:06
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Re: Wow! :-)
By: horny on Sat, 22 July 2006 04:56
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Re: Wow! :-)
By: Damir on Sun, 23 July 2006 07:14
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Re: Wow! :-)
By: horny on Sat, 29 July 2006 03:59
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Sun, 13 August 2006 04:04
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Sun, 13 August 2006 16:00
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Re: SE 300B Project, Part 13 - The finished amp
By: horny on Wed, 16 August 2006 14:43
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Re: SE 300B Project, Part 13 - The finished amp
By: Damir on Thu, 17 August 2006 07:45
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Re: SE 300B Project, Part 13 - The finished amp
By: red on Wed, 01 August 2007 06:24
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