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Re: SE 300B Project, Part 13 - The finished amp [message #31926 is a reply to message #31925]

Tue, 11 July 2006 11:33

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

Unfortunately, I don`t have any experience with TVC - please, try it and report how it worked out!

For the input capacitance of CCS loaded (I assume that you use CCS?!) stage, we must "count" on large "Miller" capacitance. Although EC8010 data said Cag=1,9pF, Morgan Jones measured 4,6pF-4,8pF (!), and if it is actually true, you can expect ~ 300pF on the triode input! If you have "Valve Amplifiers 3" - it`s on the page 560 and around...

For C3g, data said Cag in triode 2,7pF, let`s say 3pF - then we can expect probably ~160pF of input capacitance.
Again, my opinion is to build the 90% of the amp "as is" (PS and output stage, and part of the input stage), then temporarily try EC8010 on its socket and its parts soldered on socket pins. Then try C3g version, with various options (Rk or LED bias, g3 connections...).
Only then you`ll know for sure what works for you.

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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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