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Old 21st March 2002, 06:40 PM   #1
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Default 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
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Old 21st March 2002, 11:02 PM   #2
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Default What is it you need to know?

2 x EF86
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13 watts
Lovely sound

http://www.geocities.com/ResearchTri...722/index.html
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Old 9th September 2004, 08:04 AM   #3
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Default Quad II Output Transformer

Hello,

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

Thanks

Pascal.
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Old 9th September 2004, 08:35 AM   #4
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Yeah, I'd kinda like to know the % of cathode feedback
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Old 11th September 2004, 12:46 AM   #5
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"Valve Amplifiers" states that the ratio is 9.375:1 between anode and cathode windings, which equates to 11%.
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Old 11th September 2004, 01:00 AM   #6
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Thanks
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Old 11th September 2004, 01:00 AM   #7
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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,
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Old 11th September 2004, 01:48 AM   #8
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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.
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Old 11th September 2004, 02:38 AM   #9
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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.
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Old 11th September 2004, 11:39 AM   #10
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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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