[Thinker1920]

Ok so I'm still doing a lot of research to understand ultralinear vs single-ended, and I came across an article talking about the output transformers of Single-Ended vs Ultralinear and discovered that a Ultralinear will have four connections to the output transformer and the Single-ended with have two.

  So this makes me ask the question why does the miniwatt N3 have four? I took it apart it has four, I know this for a fact. So whats the deal what am I missing? and I've been reading about converting an ultra linear into a super triode here http://www.mennovanderveen.nl/eng/index.html, and many others also talked about an easier way, which makes me wonder what the person was talking about when they told me that it's not possible to turn a ultralinear into a Triode amp? (maybe that wasn't what I asked? what's the difference from a triode and a single-ended then?)

   These are my thoughts after wandering the internet, clarity would be much apreciated

[FullRangeMan]

My 2 cents are:
In a Triode connected amp the output is only the Anode or Plate from the output tube.
A Triode tube connected in UL had the grid also connected to the output(anode, transformer etc) hence the extra power avaliable, than the simpler Triode mode.

[JohnR]

It's a pentode, so one might be the screen. And perhaps another one for feedback. Here's an example:

  http://www.single-ended.com/EL156amp.htm

[FullRangeMan]

which makes me wonder what the person was talking about when they told me that it's not possible to turn a ultralinear into a Triode amp?

Various PrimaLuna amps are both Triode and UL, changed on the fly by the remote control, that may be nice to made A-B tests.
http://www.primaluna-usa.com/product-main/dialogue/dialogue-one
Rated at 18W Triode or 36W UL.

[JakeJ]

I'm glad you gents made the correct interpretation of the question as I had thought he was asking about the output side of the transformer.  My answer would have been...

[Thinker1920]

the connections are labeled B+, P, out, and ground

[Ericus Rex]

That's the power transformer, not one of the output transformers.

[JohnR]

I don't think it's the power transformer... but anyway, Thinker has the thing, there's only so much anyone else can guess about what it is without actually being able to see and measure it.

[richidoo]

The manual says it runs in pentode mode, not triode or ultra-linear mode. I think pentode mode requires an additional screen connection to the primary, so that's probably your OUT wire. The power supply is switch mode, inside the box.

http://www.audiokarma.org/forums/showthread.php?t=163570

[Ericus Rex]

But why would an output tranny have a B+ or screen connection at all?  It should only have anode and possibly feedback connections to the primary.  What am I missing here?

[JohnR]

It has to be connected to B+. That's where the power comes from. Unless it's some kind of "parafeed" design. Screen - that's the ultra-linear part.

[Thinker1920]

but it's suppose to be a single ended amp? I have pic just gotta figureout which camera

[FullRangeMan]

Seems to me a output trafo do not had a B+ input. It may be a transformer from the power supply.

[JohnR]

In most amplifiers, the output transformer is connected to B+. Please view the first diagram here:

http://www.mennovanderveen.nl/eng/project6.html

The left configuration is the most common.

Before the remark is made that there are only two connections, please view the first diagram on this page:

http://www.mennovanderveen.nl/eng/project7.html

This is a single-ended pentode.

You will also see that there are many other connections. Speculating about which one specifically the miniwatt is is somewhat futile.

BTW thanks to Thinker1920 for providing the link to the Menno van der Veen page - very interesting

[Thinker1920]

Well I checked the camera card and the pics were deleted I let my mom borrow my camera

 I too thought that link was pretty cool but, instead of messing with my yaqin I'm probably just going to sell it ...... I like the single ended motorola so much that I'm selling the miniwatt.

I think if I'm able to sell the yaqin I'm going to build a single ended amp. any sugestions?

  Is the 300B the most powerful tube for that application?

                Thanks

[Ericus Rex]

The GM70 is probably the most powerful tube you can make an SET with.  Be prepared for 1K+ volt B+!!!!!!!