Quad 22 Valve Amps

[WARREN]

Hi

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

Regards

 

[lilolee]

What is it you need to know?

2 x EF86
2 x KT66
13 watts
Lovely sound

http://www.geocities.com/ResearchTriangle/Lab/6722/index.html

 

[PTSOUNDLAB]

Quad II Output Transformer

Hello,

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

Thanks

Pascal.

 

[Geek]

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

 

[EC8010]

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

 

[Geek]

Thanks

 

[fdegrove]

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]

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]

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]

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/