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
Small vacuum tube integrated for desktop use
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="Mars" data-source="post: 1116427" data-attributes="member: 817"><p>Here is a photo of the test rig:</p><p></p><p>BTW I am using a 6N1P tube as a driver (triodes paralleled with 22k anode load and 220 ohm cathode resistor)</p><p></p><p><img src="https://i.imgur.com/LHp4oSU.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/TiuxQJ6.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I starrted the tests with the 807 in cathode bias mode with a 470 ohm cathode resistor. Voltage from anode to cathode is about 390 VDC</p><p></p><p>The output into a 8.3 ohm dummy load came to 6.3V before clipping</p><p></p><p><img src="https://i.imgur.com/8FFAszj.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I checked the plate dissipation, and it was 19 watts. The 807 can dissipate 25 watts through the anode.</p><p></p><p>Next I used a 330 ohm cathode resistor and the dissipation went up to 22 watts.</p><p></p><p>Output rose to 8V into the dummy load</p><p></p><p><img src="https://i.imgur.com/hM2IZK8.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>That is equal to 8 watts music power. </p><p></p><p>I can probably get more output power if I reduce the load resistor from 8 to 6 ohm.</p></blockquote><p></p>
[QUOTE="Mars, post: 1116427, member: 817"] Here is a photo of the test rig: BTW I am using a 6N1P tube as a driver (triodes paralleled with 22k anode load and 220 ohm cathode resistor) [img]https://i.imgur.com/LHp4oSU.jpg[/img] [img]https://i.imgur.com/TiuxQJ6.jpg[/img] I starrted the tests with the 807 in cathode bias mode with a 470 ohm cathode resistor. Voltage from anode to cathode is about 390 VDC The output into a 8.3 ohm dummy load came to 6.3V before clipping [img]https://i.imgur.com/8FFAszj.jpg[/img] I checked the plate dissipation, and it was 19 watts. The 807 can dissipate 25 watts through the anode. Next I used a 330 ohm cathode resistor and the dissipation went up to 22 watts. Output rose to 8V into the dummy load [img]https://i.imgur.com/hM2IZK8.jpg[/img] That is equal to 8 watts music power. I can probably get more output power if I reduce the load resistor from 8 to 6 ohm. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
Small vacuum tube integrated for desktop use
Top