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Re: Steve Brown and I are working on this amp [message #31959 is a reply to message #31958]

Wed, 13 September 2006 14:07

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

Direct coupling has a large advantages - omiting of the coupling cap and grid choke, driver "sees" very high impedance of the output tube grid as a load, etc. Less safe and large B+ are "drawbacks"...
I considered similar circuit ("classic" SE, not parafeed), 2A3 (AD1, etc.) direct-coupled with CCS-ed 6SN7 as a driver. With convential OP (250V/-45V/60mA) input sensitivity is about 1,5Vrms...but, B+ is about 550V.

Probably, sonic "plus" gained with omitting cap/grid choke combo is a large enough to accept high voltage...just a few thoughts.

Anyway, keep us posted about your progress, seems like a interesting amp/circuit. Is the driver paralleled ECC81?

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[Message index]

		Ohm Sweet Ohm By: Damir on Wed, 06 September 2006 06:02
		Re: Ohm Sweet Ohm By: Manualblock on Wed, 06 September 2006 11:52
		Re: Ohm Sweet Ohm By: Forty2wo on Wed, 06 September 2006 23:43
		Re: Ohm Sweet Ohm By: Manualblock on Thu, 07 September 2006 12:54
		Re: Ohm Sweet Ohm By: Forty2wo on Thu, 07 September 2006 18:14
		Re: Ohm Sweet Ohm By: Manualblock on Sat, 09 September 2006 18:53
		Re: Ohm Sweet Ohm By: Forty2wo on Sun, 10 September 2006 18:59
		Re: Ohm Sweet Ohm By: Manualblock on Mon, 11 September 2006 08:34
		Re: Ohm Sweet Ohm By: Forty2wo on Thu, 14 September 2006 00:23
		Re: Ohm Sweet Ohm By: Manualblock on Thu, 14 September 2006 09:45
		Re: Ohm Sweet Ohm By: Wayne Parham on Fri, 08 September 2006 11:39
		Re: Steve Brown and I are working on this amp By: Bill Epstein on Wed, 13 September 2006 05:08
		Re: Steve Brown and I are working on this amp By: Damir on Wed, 13 September 2006 14:07
		Re: Steve Brown and I are working on this amp By: PakProtector on Wed, 13 September 2006 17:51
		Re: Ohm Sweet Ohm By: Forty2wo on Wed, 13 September 2006 22:44
		Ah there we go By: Forty2wo on Wed, 13 September 2006 22:47
		Re: Ah there we go By: Manualblock on Thu, 14 September 2006 09:36
		Re: Ah there we go By: Forty2wo on Sun, 17 September 2006 21:06

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