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Speaker amps for headphones - Page 144

post #2146 of 3116
Quote:
Originally Posted by ALRAINBOW View Post

Its scary to someone who does not know. . They most likely overheat the boards and it goes down hill from there . Im sure we have done that right guys ?

But the tip is paramount , and few have a clue to that. I do hi temp quick solder jobs on RC stuff. 10 or 8 gauge attached to a tiny tip. It needs to be done quick and very hot . Both sides tinned of course.

Al. D

When I was new, I used a small tip and low heat. It seemed logical to me at the time that you only want to melt the solder and not overheat your parts, and use a small tip so as to avoid kludging around with a bigger one. After about 2 hours of frustration trying to solder some wires, I got on Youtube and realized it was the opposite lol. You use high heat because you dont want to dwell on the joint, which will heat up the component, you can work faster, and a bigger tip just equates to better thermal mass and stability. There's a rare occasion that I switch out my 2mm chisel tip. It does nearly everything, when you know the proper technique.

post #2147 of 3116
You tub. Ha. I'm 56 there was barly tv. Lol

I read the directions all three sentices
Esp the don't get burned part.

And flux in a tub came much later.

I did learn from brother he was 17 years my senior
Funny utub hahahaha
post #2148 of 3116
Quote:
Originally Posted by Chris J View Post

Yes, a speaker amplifier is basically a voltage source.
Obviously some speaker amps will have a higher output impedance than other amps.
For example, tube power amps typically have a higher output impedance than SS power amps.

So what you say is basically correct:
Let's assume the output impedance is very low
The 150 Watt amp will produce 35 volts AT FULL OUTPUT into the HE-6.

You can connect the HE-6 directly across the output terminals of the power amp,
BUT:
watch the volume!
this IS enough voltage to destroy the HE-6 'phones!
If you set the volume to a comfortable listening level, the hiss (thermal noise) from the power amp may be too high, as the amp was designed to drive speakers, not headphones.

P.S.
Someone will pipe up and say that there are a handful of power amp designs that are actually current sources.
OK, but these are pretty rare. 

To me the challenge is getting an amp with low noise so that you do not need resistors. I use a. 150 watt amp with a tube input section. The amp is quiet, but sometimes you get tubes with a bit of noise. Resistors in series will basically eliminate it, but there is a loss of intimacy in the music. If you just listen with resistors, you can be quite pleased. But if you try without them you realize how much better it can be.
post #2149 of 3116
Quote:
Originally Posted by ALRAINBOW View Post

You tub. Ha. I'm 56 there was barly tv. Lol

I read the directions all three sentices
Esp the don't get burned part.

And flux in a tub came much later.

I did learn from brother he was 17 years my senior
Funny utub hahahaha

Lol! :D

post #2150 of 3116
I had to reply to that. While on am tubing in the snow with my kid. Lol
post #2151 of 3116
Quote:
Originally Posted by gjc11028 View Post

To me the challenge is getting an amp with low noise so that you do not need resistors. I use a. 150 watt amp with a tube input section. The amp is quiet, but sometimes you get tubes with a bit of noise. Resistors in series will basically eliminate it, but there is a loss of intimacy in the music. If you just listen with resistors, you can be quite pleased. But if you try without them you realize how much better it can be.
S/N ratio above 80 dB should not generates hearable noise.
However even though amp with enough specification generates noticeable noise in real world.
post #2152 of 3116
Quote:
Originally Posted by Joong View Post


S/N ratio above 80 dB should not generates hearable noise.
However even though amp with enough specification generates noticeable noise in real world.

Which just goes to show you cannot rely on manufacturer specifications to determine if a given amp will work with your headphones....  You must LISTEN!

post #2153 of 3116
Quote:
Originally Posted by potterma View Post
 

Which just goes to show you cannot rely on manufacturer specifications to determine if a given amp will work with your headphones....  You must LISTEN!

+1 I have tried developing some elaborate spreadsheets to determine what amps fit which headphones, but it is just futile. There's no way we can discern on paper what something will sound like. Headphones should be even simpler, but again it's just impossible to determine from graphs and plots what it will sound like. I wish I could have an elaborate "magic formula" but it simply doesn't exist...sigh

post #2154 of 3116
Wow. Are saying that guy or girl who answered
The phone or email. Or the guy or girl
Who date I say designed it lied to you
That is simply absurd. They are the god like maker
Of the stuff why buy with god in trust on the bills
Wow all this god has me wanting to go to church in the morning

I spoke to me david halfler about 35 years or so ago
As I hade several of his amps I built
Ps BRUNK with that Lousey pencil
Solder iron. Not your state of the art jammy
You have. But I have them to now hahaha
Anyway I asked him about using it for a headphone amp.
His reply you might ask was. At your own risk.

Lmao. I do not belive any amp maker or builder
It's About selling product. This is why we hear noise.
But the spec says no. My 15 year old Aragons rated at 400 watts at 8 ohms are silent
But I still used the resister attenuation anyway.

I am not laughing at you people as I do not know all and many of you know way more than me
I just think it can't hurt so do it.

Al. D
post #2155 of 3116

Here's a short youtube video I just did showing electric guitar audio on the new oscilloscope. I attempt to demo how multiple sounds (string notes) are summed into complex waves. It's a good visualization of an alternating voltage electronic audio signal and it applies to amps and headphones too. I used an electro acoustic guitar so you can hear the notes I was playing. I use the scope's measurement function to show the note's frequency and peak-to-peak voltage. I absolutely love this scope--it beats the hell out of my old analog boat anchor which has been relegated to the garage.

 

post #2156 of 3116

Cool stuff Rob! Glad you're enjoying the new scope :D Prime example of making Science "cool" to the youth.

post #2157 of 3116
Quote:
Originally Posted by robrob View Post
  Click for the video! (Click to show)

 

 

 

Cool video, Rob!  Interesting to see all the harmonics in the single string plucks.

post #2158 of 3116
Quote:
Originally Posted by potterma View Post
 

 

Cool video, Rob!  Interesting to see all the harmonics in the single string plucks.

Yeah it is, and you can sort of extrapolate that to a "rich" sounding guitar, which it is. It sounds very nice btw Rob :)

post #2159 of 3116
Ok people i need help looking for an amp suitable for he6 . Battery powered. Can be external battery . Who ?
post #2160 of 3116
Forgot please

Al
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