Quad 22 Valve Amps

WARREN · 21st March 2002, 05:40 PM

Hi

Has anyone got any info diags etc on the Quad 22 monoblock valve amps. Type of tubes used etc

Regards

lilolee · 21st March 2002, 10:02 PM

2 x EF86
2 x KT66
13 watts
Lovely sound

http://www.geocities.com/ResearchTri...722/index.html

PTSOUNDLAB · 9th September 2004, 07:04 AM

Hello,

does somebody know the specifications of Quad II output transformers ? Primary ?

Thanks

Pascal.

Geek · 9th September 2004, 07:35 AM

Yeah, I'd kinda like to know the % of cathode feedback

EC8010 · 10th September 2004, 11:46 PM

"Valve Amplifiers" states that the ratio is 9.375:1 between anode and cathode windings, which equates to 11%.

Geek · 11th September 2004, 12:00 AM

Thanks

fdegrove · 11th September 2004, 12:00 AM

Hi,

While I must have stated this before, I often find that valve amps using this CFB configuration sound more musically convincing, I can't help but wonder why it's so hard to find a manufacturer who actually carries a range of these OPTS in their product catalogue.

Is there any particular reason for this that you guys are aware of?

Cheers,

EC8010 · 11th September 2004, 12:48 AM

Yes. It needs very careful output transformer design to keep the thing stable. (For stability) it's much easier to apply global feedback than cathode feedback at the output stage to produce a given distortion figure.

Geek · 11th September 2004, 01:38 AM

I did discuss a CFB tranny over email with Robert Hammond about six months back. He believes the idea has merit and passed it on to his engineers.

powertriode · 11th September 2004, 10:39 AM

I'm pretty sure that Sowter would build as a custom if required.
Also, they carry design data for a number of 'classic' tube amps.

http://www.sowter.co.uk/

21st March 2002, 05:40 PM	#1
WARREN diyAudio Member Join Date: Mar 2002	Quad 22 Valve Amps Hi Has anyone got any info diags etc on the Quad 22 monoblock valve amps. Type of tubes used etc Regards

21st March 2002, 10:02 PM	#2
lilolee diyAudio Member Join Date: Jul 2001 Location: London, UK	What is it you need to know? 2 x EF86 2 x KT66 13 watts Lovely sound http://www.geocities.com/ResearchTri...722/index.html

9th September 2004, 07:04 AM	#3
PTSOUNDLAB diyAudio Member Join Date: Dec 2001 Location: FRANCE / TOULOUSE	Quad II Output Transformer Hello, does somebody know the specifications of Quad II output transformers ? Primary ? Thanks Pascal.

10th September 2004, 11:46 PM	#5
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	"Valve Amplifiers" states that the ratio is 9.375:1 between anode and cathode windings, which equates to 11%. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

11th September 2004, 12:00 AM	#7
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, While I must have stated this before, I often find that valve amps using this CFB configuration sound more musically convincing, I can't help but wonder why it's so hard to find a manufacturer who actually carries a range of these OPTS in their product catalogue. Is there any particular reason for this that you guys are aware of? Cheers, __________________ Frank


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9th September 2004, 07:35 AM	#4
Geek diyAudio Member Join Date: Sep 2004	Yeah, I'd kinda like to know the % of cathode feedback

11th September 2004, 12:48 AM	#8
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Yes. It needs very careful output transformer design to keep the thing stable. (For stability) it's much easier to apply global feedback than cathode feedback at the output stage to produce a given distortion figure. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

11th September 2004, 01:38 AM	#9
Geek diyAudio Member Join Date: Sep 2004	I did discuss a CFB tranny over email with Robert Hammond about six months back. He believes the idea has merit and passed it on to his engineers.

11th September 2004, 10:39 AM	#10
powertriode diyAudio Member Join Date: Jun 2004 Location: South East	I'm pretty sure that Sowter would build as a custom if required. Also, they carry design data for a number of 'classic' tube amps. http://www.sowter.co.uk/

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