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Amps that can drive the HiFiMan HE-6 planar headphones - Page 147

post #2191 of 4932
Quote:
Originally Posted by Steve Eddy View Post
 

 

Technically, yeah.

 

You see, the purpose of output transformers in amps like that is to present the tube driving them with an ideal load for that particular tube. So for example let's say the tube wants a 5k load on its plate. Well, in order to get that from a nominal 8 ohm loudspeaker load, the transformer has to be a step-down type with a 25:1 ratio. Transformers reflect impedances as the square of their turns ratio so with an 8 ohm load on the secondary, the tube will see 25^2 x 8, or 5,000 ohms. Now let's say you connect a 50 ohm headphone to the 8 ohm tap. Instead of seeing a 5k load on its plate, the tube will now see 25^2 x 50 or about 31,000 ohms. With the HE adapter connected to a 50 ohm headphone, the impedance on the secondary is 33 ohms so the tube will see a load of about 21,000 ohms.

 

Eliminate that series resistor and the secondary will see 10 ohms in parallel with 50 ohms, or about 8.3 ohms and now the tube will be loaded with something much closer to the 5k ohms it wants to see.

 

se

 

 

 

Thanks for your input, se. I had a feeling this match wasn't optimal and was being held back. Temptation has me wanting to send the adapter your way with a commish! Will knock on a few more doors explaining to those that answer "Here's what I need done..."

 

Lastly, if I'm going to making changes inside the box, is there any advantage to running the amp @ 8 Ohms or 16 Ohms for the HE-6?

 

Additionally, the little piggies are neat & tidy. No need for a new adapter or work done for the HPO. :wink:


Edited by Silent One - 11/25/13 at 7:50pm
post #2192 of 4932
Quote:
Originally Posted by Silent One View Post



Thanks for your input, se. I had a feeling this match wasn't optimal and was being held back. Temptation has me wanting to send the adapter your way with a commish! Will knock on a few more doors explaining to those that answer "Here's what I need done..."

Lastly, if I'm going to making changes inside the box, is there any advantage to running the amp @ 8 Ohms or 16 Ohms for the HE-6?

Additionally, the little piggies are neat & tidy. No need for a new adapter or work done for the HPO. wink.gif

I can bypass the series resistors in my adapter and I think you would like I your adapter better without them. I might also suggest replacing the cheap binding posts -- cardas copper are only 35 bucks or so.
post #2193 of 4932
Quote:
Originally Posted by gjc11028 View Post
 
 
I can bypass the series resistors in my adapter and I think you would like I your adapter better without them. I might also suggest replacing the cheap binding posts -- cardas copper are only 35 bucks or so.

 

Thanks. I was trying to go custom with the AudioCircle cat but he hasn't responded to any of my emails the past few months. Can't wait for someone to modify this box! 

post #2194 of 4932
Quote:
Originally Posted by brunk View Post
 

^ +1 to Mr. Eddy's excellent post. :)

 

Thanks, brunk! I received a HeadFi notification EMail saying I'd been given "Reputation." Is that what the green thumbs up thingie does?

 

se

post #2195 of 4932

So... just to make DOUBLE sure I don't melt my $0.99 monos :rolleyes: the resistors shown below are parallel and this is what I'm going to do?

 

LL

post #2196 of 4932
Quote:
Originally Posted by Silent One View Post
 

Lastly, if I'm going to making changes inside the box, is there any advantage to running the amp @ 8 Ohms or 16 Ohms for the HE-6?

 

Depends. Going 8 ohm would give you a bit more attenuation and 16 would give you a bit less. And with 16 ohm, there would be less power needing to be dissipated in the resistor.

 

Quote:
 Additionally, the little piggies are neat & tidy. No need for a new adapter or work done for the HPO. :wink:

 

Okie doke.

 

se

post #2197 of 4932
Quote:
Originally Posted by Silent One View Post
 

So... just to make DOUBLE sure I don't melt my $0.99 monos :rolleyes: the resistors shown below are parallel and this is what I'm going to do?

 

 

That's correct.

 

se

post #2198 of 4932

Thanks. Hmmm... I think I'll keep the amps at 8 Ohm and pick up 10 Ohm resistors and plug 'em in tomorrow; Wednesday.

 

 

Would you know if Fry's Electronics carry the type I'm looking for?


Edited by Silent One - 11/25/13 at 10:48pm
post #2199 of 4932
Quote:
Originally Posted by Silent One View Post
Would you know if Fry's Electronics carry the type I'm looking for?

 

I'd like to think so but I haven't really kept up with Fry's for years. I just open up my Mouser catalog when I'm looking for stuff like that. :D

 

se

post #2200 of 4932
Quote:
Originally Posted by Steve Eddy View Post
 

 

Thanks, brunk! I received a HeadFi notification EMail saying I'd been given "Reputation." Is that what the green thumbs up thingie does?

 

se

Hehe yep! Sorry for the inadvertent spam, I don't do email notifications anymore :redface:

post #2201 of 4932
Quote:
Originally Posted by brunk View Post
 

Hehe yep! Sorry for the inadvertent spam, I don't do email notifications anymore :redface:

 

Oh, nothing to be sorry about. Wasn't a problem at all. Was just curious how it came about as I'd not received such a notice before.

 

Thanks!

 

se

post #2202 of 4932

Something was reset by HF - I just started getting notifications end of October I had never gotten before...

post #2203 of 4932
Quote:
Originally Posted by Silent One View Post
 

Something was reset by HF - I just started getting notifications end of October I had never gotten before...

 

Yeah - me to, very annoying :cool:

 

I've been thing about selling my F1J and getting one of these:  Pass Labs XA-30.5 stereo power amp  :eek:

post #2204 of 4932
Quote:
Originally Posted by Silent One View Post

Something was reset by HF - I just started getting notifications end of October I had never gotten before...

Yeah, I first started getting the "So-and-so has quoted you..." messages. Which I rather like actually since I tend to get distracted at times and lose track of the threads I've participated in.

se
post #2205 of 4932
Quote:
Originally Posted by preproman View Post
 
 

 

Yeah - me to, very annoying :cool:

 

I've been thing about selling my F1J and getting one of these:  Pass Labs XA-30.5 stereo power amp  :eek:

 

Do it... do it :evil:now!

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