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Re: SE 300B Project, Part 13 - The finished amp [message #31948 is a reply to message #31947]

Thu, 17 August 2006 07:45

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

There`re various red LEDs, and mostly the cheap and simple ones have lower internal resistance (about 4,3 Ohms with 10mA, and U~1,7V - "Valve amplifiers 3" source). This voltage drop depends a little with current through the LED - I suppose that you used CCS with ~11mA, like me? Specs for C3g are Ua=Ug2=220V max., and you are just fine...and probably you used right LEDs, too.
Try to "burn in" your amp a few hours more (a few tens or hundreds h even more desirable:-)) and then decide can you live with this sound like a final version. I`m out of ideas here...you can try various "boutique" cathode resistor(s) bypassed with other types of caps, say 4-5 pcs 22µF MKP in parallel...but for me, red LEDs bias sounds better, and I built the amp (finally) that way - CCS+anode out, g3 on anode, LEDs bias - as I said previously...
Did you try interstage version, too with LEDs bias? (Of course, B1+ must be different, about 200-210V + drop into Rw of ITT).
Of course, please - post us your findings...

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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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