Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Audio and Video Talk
Valves / Vacuum Tubes
Sansui BA 303 and BA 202 valve power amplifiers
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="charles" data-source="post: 674422" data-attributes="member: 2759"><p>Dear Ampdog,</p><p></p><p>Regarding the AU 111. "It also has a rather better thd figure because of the Quad-like output topology (U.L. with partial cathode loading)."</p><p></p><p>Some correction please:</p><p>According to the AU 111's specification (service manual page page 5), the THD is 0.8% and IMD is 0.8% at rated output.</p><p>According to the BA 303's specification (service manual page page 16), the THD is less than 0.5% and IMD is less than 0.7% at rated output. The distortion is even less than 0.3% at a slightly reduced frequency bandwidth. </p><p></p><p>Also the BA 303 is a triode connected valve amplifier.</p><p></p><p>According to the service manual (page 2):</p><p>"Although the world's famous GEC KT-88 power output tubes are capable of delivering 100-watt power if they are used a beam power tubes, we ventured to employ them in the triode connections of Class AB1, push pull design in order to minimize the internal resistance, THD total harmonic distortion and IM distortion and to raise the damping factor over bass range. The BA-303 solves such problems on hi-fi reproduction as boomy and exaggerated bass tones. All the stages from the first to the driver are composed of the selected triodes with minimum internal resistances and maximum amplification factor possible. Thus, the BA-303 is not subject to the Miller effect and its treble response is much improved." </p><p></p><p>In the introduction of the Operating Instructions and Service Manual:</p><p></p><p>" Yours is a hand-made amplifier designed exclusively for most critical audio perfectionists" </p><p></p><p></p><p> </p></blockquote><p></p>
[QUOTE="charles, post: 674422, member: 2759"] Dear Ampdog, Regarding the AU 111. "It also has a rather better thd figure because of the Quad-like output topology (U.L. with partial cathode loading)." Some correction please: According to the AU 111's specification (service manual page page 5), the THD is 0.8% and IMD is 0.8% at rated output. According to the BA 303's specification (service manual page page 16), the THD is less than 0.5% and IMD is less than 0.7% at rated output. The distortion is even less than 0.3% at a slightly reduced frequency bandwidth. Also the BA 303 is a triode connected valve amplifier. According to the service manual (page 2): "Although the world's famous GEC KT-88 power output tubes are capable of delivering 100-watt power if they are used a beam power tubes, we ventured to employ them in the triode connections of Class AB1, push pull design in order to minimize the internal resistance, THD total harmonic distortion and IM distortion and to raise the damping factor over bass range. The BA-303 solves such problems on hi-fi reproduction as boomy and exaggerated bass tones. All the stages from the first to the driver are composed of the selected triodes with minimum internal resistances and maximum amplification factor possible. Thus, the BA-303 is not subject to the Miller effect and its treble response is much improved." In the introduction of the Operating Instructions and Service Manual: " Yours is a hand-made amplifier designed exclusively for most critical audio perfectionists" [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
Sansui BA 303 and BA 202 valve power amplifiers
Top