Eddie Current DIY amplifier "Monolith"

[DefQon]

lol darkstar. 

 

[shipsupt]

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.

 

[Lil' Knight]

Pics please.

 

[DefQon]

Pics please.

+1

 

[palchiu]

Transformers is better sound?

 

 

[shipsupt]

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

Transformers is better sound?

 

 

[mcluxun]

Quote:

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?

 

[shipsupt]

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

 

[mcluxun]

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

 

[shipsupt]

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. 
 

 

[NateH]

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? 

 

[DefQon]

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

 

[holland]

Quote:

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

 

[mcluxun]

Quote:

 
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.

 

[holland]

Quote:

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.