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
The Vintage Audio Section
My Vintage Collection: Time for some Housekeeping - or not?
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="Ampdog" data-source="post: 777944" data-attributes="member: 144"><p><span style="font-size: 19px"><span style="color: red">DANGER NOTE!</span></span></p><p></p><p>Just found this interesting thread while coming here from F_D's note regarding the Mullard 510 in another thread.</p><p></p><p>BUT:</p><p>I cannot seem to find the relevant post from Charles referred to above, but one does NOT put KT88s in the AU111!! Beside a significantly higher heater current than 6L6, the characterisitcs are sufficiently different to upset the power stage. With due respect, some people think that merely replacing a power valve by a 'more powerful' one (sic) will give a higher output.</p><p></p><p>Such is not the case; the maximum output of any amplifier is governed by the available h.t. voltage and somewhat by the circuit design, NEVER by simply a 'stronger' valve. In the AU111 the power stages are somewhat unbalanced regarding phase compensation at high and super audio freuqencies, which may further be upset by valves significantly different from 6L6.</p><p></p><p>Sorry about the late remark (hopefully not too late!); I noticed the otherwise very informative topic only now.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 777944, member: 144"] [SIZE=19px][color=red]DANGER NOTE![/color][/SIZE] Just found this interesting thread while coming here from F_D's note regarding the Mullard 510 in another thread. BUT: I cannot seem to find the relevant post from Charles referred to above, but one does NOT put KT88s in the AU111!! Beside a significantly higher heater current than 6L6, the characterisitcs are sufficiently different to upset the power stage. With due respect, some people think that merely replacing a power valve by a 'more powerful' one (sic) will give a higher output. Such is not the case; the maximum output of any amplifier is governed by the available h.t. voltage and somewhat by the circuit design, NEVER by simply a 'stronger' valve. In the AU111 the power stages are somewhat unbalanced regarding phase compensation at high and super audio freuqencies, which may further be upset by valves significantly different from 6L6. Sorry about the late remark (hopefully not too late!); I noticed the otherwise very informative topic only now. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
The Vintage Audio Section
My Vintage Collection: Time for some Housekeeping - or not?
Top