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
SCC88/PCC88 heaters in series?
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: 1096061" data-attributes="member: 144"><p>? ? ? ? A thermionic valve operates basically off the <em>intensity</em> of electrons 'released' by the cathode. This is a function of the temperature or then 'wattage' of the heater, which consists equally of voltage <em>and </em>current values!</p><p></p><p>and yes, kind sir! The spec-ed voltage was applied (I did pass matric physics! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" />) The general application of 6,3V to heaters (from a transformer winding - a <em>constant voltage</em> source) appears to contradict your statement of current priority. A further statement that I have read, that 6V heaters can seldom be operated in series - further strengthens the impression that it is either difficult to control the diameter and/or length of heater filament wire, or something else is the matter. One is able to connect wire-wound resistors in series with predictable results - so what be the problem here?</p><p></p><p>My initial question was thus: Why a noticeable variation at all! Is the heater wire of such uncontrollable diameter, - or was the length not cut to a specified figure? If that cannot be achieved there is certainly reason for anxiety!</p></blockquote><p></p>
[QUOTE="Ampdog, post: 1096061, member: 144"] ? ? ? ? A thermionic valve operates basically off the [i]intensity[/i] of electrons 'released' by the cathode. This is a function of the temperature or then 'wattage' of the heater, which consists equally of voltage [i]and [/i]current values! and yes, kind sir! The spec-ed voltage was applied (I did pass matric physics! :D) The general application of 6,3V to heaters (from a transformer winding - a [i]constant voltage[/i] source) appears to contradict your statement of current priority. A further statement that I have read, that 6V heaters can seldom be operated in series - further strengthens the impression that it is either difficult to control the diameter and/or length of heater filament wire, or something else is the matter. One is able to connect wire-wound resistors in series with predictable results - so what be the problem here? My initial question was thus: Why a noticeable variation at all! Is the heater wire of such uncontrollable diameter, - or was the length not cut to a specified figure? If that cannot be achieved there is certainly reason for anxiety! [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
SCC88/PCC88 heaters in series?
Top