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Vacuum Tube OTL power amp!!
Vacuum Tube OTL power amp!!
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Old 26th October 2011, 04:22 PM   #291
flatheadmurre is offline flatheadmurre  Sweden
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I got some from noratel the 24v heater toroid im going to use but the stepdown was on the low side with about 110 unloaded.

Another triout came from the swedish hammond reseller and it was running hotter then ..... at 1A /winding so a nogo even when specs said 400VA
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Old 26th October 2011, 04:23 PM   #292
M Gregg is offline M Gregg  England
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Also post 43# and 44#.

Good information!

Have to sign out .....catch you laters!


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M. Gregg

Last edited by M Gregg; 26th October 2011 at 04:26 PM.
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Old 26th October 2011, 04:39 PM   #293
flatheadmurre is offline flatheadmurre  Sweden
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Solution to overpopulated inside.

Start stacking things outside !!!

Click the image to open in full size.

From the beginning the space was intended for chokes but smallsignal HT fits fine.

Time for some regulators.
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Old 26th October 2011, 04:40 PM   #294
M Gregg is offline M Gregg  England
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Just a quick comment while I remember,

http://www.diyaudio.com/forums/tubes...-ecc82-21.html

This links to the neon protection Grid-cathode.
More information!

Regards
M. Gregg

Last edited by M Gregg; 26th October 2011 at 04:44 PM.
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Old 26th October 2011, 07:22 PM   #295
Alastair E is offline Alastair E  Wales
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Quote:
Originally Posted by flatheadmurre View Post

This is now officially the Murphys law OTL amp.

Well,--You can guarantee if I'm in the slightest bit involved in a project, It will definately turn into some kind of Audiophile Faulty-Towers.....

Murphy's Law OTL....

Hmm-- I quite like it!
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Old 26th October 2011, 07:48 PM   #296
flatheadmurre is offline flatheadmurre  Sweden
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And Flatheadmurres law says Murphy was an optimist
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Old 26th October 2011, 08:55 PM   #297
M Gregg is offline M Gregg  England
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Quote:
Originally Posted by flatheadmurre View Post
And Flatheadmurres law says Murphy was an optimist

...LOL
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Old 26th October 2011, 09:08 PM   #298
Alastair E is offline Alastair E  Wales
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Well-- I'm gonna bring this OTL into the '21st century'.....

Just bought one of these from fleagay--

eBay - The UK's Online Marketplace

I'm fed up of having to get up and turn volume down when SHMBO complains its too loud....!
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Old 26th October 2011, 09:12 PM   #299
M Gregg is offline M Gregg  England
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Quote:
Originally Posted by Alastair E View Post
Well-- I'm gonna bring this OTL into the '21st century'.....

Just bought one of these from fleagay--

eBay - The UK's Online Marketplace

I'm fed up of having to get up and turn volume down when SHMBO complains its too loud....!
That looks interesting!
Your going to build a mark 2 aint ya?
With lots of pictures.

Yep loads of volume with just one heater running....

LOL.....

Regards
M. Gregg

Last edited by M Gregg; 26th October 2011 at 09:17 PM.
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Old 26th October 2011, 09:32 PM   #300
Alastair E is offline Alastair E  Wales
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Yup--Need to make something that at least Looks half tidy.

Currently (And this is why there's no pics) the current version looks nothing much more than a breadboard-in-a-box.--ie, a Pile 'o scrap...
--Sounds nice though!

Ive been messing round since I first built it, so many variations and alterations, a 'nice' build wouldn't have got modded much, so would have limited 'research'....

Only one thing more I would like to try, and thats to MOSFET load the second gain stage,--See if its worth the effort...

--I tried MOSFET followers driving the 6C33C, but no huge leap forward in sound for the extra parts etc, so has returned to the scheme as you have it....
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