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Eddie Current DIY amplifier "Monolith" - Page 7

post #91 of 172

lol darkstar. 

post #92 of 172

The correct transformers arrived yesterday and I got them into the amp tonight.  Whoa, what a difference.  I'm not sure I'd even recommend building this amp cap coupled.  Much, much better now... 

 

Time to start fitting everything into a chassis.

post #93 of 172
Pics please. smily_headphones1.gif
post #94 of 172
Quote:
Originally Posted by Lil' Knight View Post

Pics please. smily_headphones1.gif

+1
post #95 of 172

Transformers is better sound? eek.gif
 

post #96 of 172

Much better.  Most notably the bottom end.  I'll post some pics when I'm back in the shop this weekend.

 

Quote:
Originally Posted by palchiu View Post

Transformers is better sound? eek.gif
 

post #97 of 172
Quote:
Originally Posted by shipsupt View Post

Much better.  Most notably the bottom end.  I'll post some pics when I'm back in the shop this weekend.

 

Hey shipsupt

I found one place online selling the transformers $88 for 2:http://www.tech-diy.com/Store/TubeStuff.htm

did you get a better deal from cinemag?

post #98 of 172

If that is 2 for $88, that's a good deal.  They were $50 ea. direct from Cinemag. 

post #99 of 172

 

Started soldering.
shipupt how did you do Q1 and Q2? does polarity matter here?

Edited by mcluxun - 6/25/13 at 8:34pm
post #100 of 172

Yes, polarity definitely matters on those.  I used a tester and confirmed the pins.  I made sure that the emitter pin was towards R7/R8 appropriately.  it's also important to get the right one on each side, Q1 is NPN and Q2 is PNP.

 

If you can't confirm the pins on the component you can likely cheat a little using this picture.  The heat sinks clip to metal side of the component.  You can see how they will get aligned in the photo. 

 

post #101 of 172

Just out of curiosity can you wire this amp to be balanced or not balanced input and balanced or not balanced output with the transformers in? I talked to Craig and I know that I can do balanced or not for the input but will it cause a problem on the output if I just plug in a regular old not balanced pair of headphones to the R+ and L+ and leave the R- and L- untouched? 

post #102 of 172

Looking shipsupts pictures, this amp looks pretty small size wise. 

post #103 of 172
Quote:
Originally Posted by NateH View Post

Just out of curiosity can you wire this amp to be balanced or not balanced input and balanced or not balanced output with the transformers in? I talked to Craig and I know that I can do balanced or not for the input but will it cause a problem on the output if I just plug in a regular old not balanced pair of headphones to the R+ and L+ and leave the R- and L- untouched? 

 

It's fine.  Do note, you must use the transformer input if your source is single ended.  The volume control relies on a differential input.  You could also use R- and L- for a phase inverted output, it could be interesting to listen to it.  Also, note this on his page.

 

Quote:

  -- The amplifier will drive headphones balanced, or single ended

post #104 of 172
Quote:
Originally Posted by holland View Post

 

It's fine.  Do note, you must use the transformer input if your source is single ended.  The volume control relies on a differential input.  You could also use R- and L- for a phase inverted output, it could be interesting to listen to it.  Also, note this on his page.

 

That's an interesting idea. I bought 2 neutrik combo jack for output (3pin XLR/ 6.5mm TRS).

So I could have 2 single end output with inverted phase, and a balanced output too.

post #105 of 172
Quote:
Originally Posted by mcluxun View Post

That's an interesting idea. I bought 2 neutrik combo jack for output (3pin XLR/ 6.5mm TRS).

So I could have 2 single end output with inverted phase, and a balanced output too.

 

Yeah, I don't think anyone would notice.  Besides, some amps invert phase and nobody notices. :)

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