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Valves / Vacuum Tubes
QUAD II (old old stock): Alternatives to KT66?
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<blockquote data-quote="Nidri" data-source="post: 927344" data-attributes="member: 1342"><p>Thank you Ampdog for the helpful reply.</p><p></p><p>FWIW, I couldn't see any reference to matching in the 'instruction book' that I found (on HiFi Engine):</p><p>"VALVES: 2 x EF.86 (Z.729 or 6267), 2 x KT.66, 1 x GZ.32 (54KU. or 5V4G.)"</p><p>(FILE: hfe_quad_22_quad_ii_instruction_book_5c-4-76_en.pdf)</p><p></p><p>However, in what is labeled as a 'brochure', on the same site, I found the following:</p><p>"VALVES: 2 x EF.86 (Z.729 or 6267), 2 x KT.66 (5883 or 6L6G <em>matched</em>), 1 x GZ.32 (54KU. or 5V4G.)"</p><p>(FILE: hfe_quad_ii_brochure.pdf)</p><p>But then, the very same brochure <em>also</em> states, "Low distortion is not dependent on 'matched' valves and the figures given cover the whole tolerance of commercial valve manufacturers tests."</p><p>Didn't exactly leave me with a crystal clear take-out.</p><p></p><p>Of course, I did also read through lots of forum threads on other (global) sites.</p><p>Lots of opinions on what's best for these amps, and some of these opinions are contradictory.</p><p>Hence I thought it worthwhile to ask the question here on AVF.</p><p>These amps may have been around for many, many years, but this is my first experience with them,</p><p>and I just want to understand what I'm dealing with a little better.</p><p>(Not that I have the technical knowledge to understand the deeper intricacies of the Quad II circuit, but I'm trying.)</p><p></p><p>So, as I said, I am very grateful for your most helpful response.</p><p>Thank you.</p></blockquote><p></p>
[QUOTE="Nidri, post: 927344, member: 1342"] Thank you Ampdog for the helpful reply. FWIW, I couldn't see any reference to matching in the 'instruction book' that I found (on HiFi Engine): "VALVES: 2 x EF.86 (Z.729 or 6267), 2 x KT.66, 1 x GZ.32 (54KU. or 5V4G.)" (FILE: hfe_quad_22_quad_ii_instruction_book_5c-4-76_en.pdf) However, in what is labeled as a 'brochure', on the same site, I found the following: "VALVES: 2 x EF.86 (Z.729 or 6267), 2 x KT.66 (5883 or 6L6G [i]matched[/i]), 1 x GZ.32 (54KU. or 5V4G.)" (FILE: hfe_quad_ii_brochure.pdf) But then, the very same brochure [i]also[/i] states, "Low distortion is not dependent on 'matched' valves and the figures given cover the whole tolerance of commercial valve manufacturers tests." Didn't exactly leave me with a crystal clear take-out. Of course, I did also read through lots of forum threads on other (global) sites. Lots of opinions on what's best for these amps, and some of these opinions are contradictory. Hence I thought it worthwhile to ask the question here on AVF. These amps may have been around for many, many years, but this is my first experience with them, and I just want to understand what I'm dealing with a little better. (Not that I have the technical knowledge to understand the deeper intricacies of the Quad II circuit, but I'm trying.) So, as I said, I am very grateful for your most helpful response. Thank you. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
QUAD II (old old stock): Alternatives to KT66?
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