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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

Illuminati (2nd Degree)

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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[Message index]

		SE 300B Project, Part 13 - The finished amp By: Damir on Mon, 26 June 2006 12:25
		Re: SE 300B Project, Part 13 - The finished amp By: Wayne Parham on Mon, 26 June 2006 16:03
		Re: SE 300B Project, Part 13 - The finished amp By: Forty2wo on Sun, 02 July 2006 14:57
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Mon, 03 July 2006 06:08
		Re: SE 300B Project, Part 13 - The finished amp By: Forty2wo on Mon, 03 July 2006 17:01
		Re: SE 300B Project, Part 13 - The finished amp By: duderduderini on Thu, 01 November 2007 07:12
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Sun, 09 July 2006 13:26
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Mon, 10 July 2006 07:08
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Tue, 11 July 2006 09:23
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Tue, 11 July 2006 10:08
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Tue, 11 July 2006 10:37
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Tue, 11 July 2006 11:33
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Fri, 21 July 2006 04:19
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Fri, 21 July 2006 07:46
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Fri, 21 July 2006 08:38
		Re: SE 300B Project, Part 13 - The finished amp By: Wayne Parham on Fri, 21 July 2006 09:24
		Wow! :-) By: Damir on Fri, 21 July 2006 14:06
		Re: Wow! :-) By: horny on Sat, 22 July 2006 04:56
		Re: Wow! :-) By: Damir on Sun, 23 July 2006 07:14
		Re: Wow! :-) By: horny on Sat, 29 July 2006 03:59
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Sun, 13 August 2006 04:04
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Sun, 13 August 2006 16:00
		Re: SE 300B Project, Part 13 - The finished amp By: horny on Wed, 16 August 2006 14:43
		Re: SE 300B Project, Part 13 - The finished amp By: Damir on Thu, 17 August 2006 07:45
		Re: SE 300B Project, Part 13 - The finished amp By: red on Wed, 01 August 2007 06:24

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