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OTL Tube amps and Grados. - Page 3

post #31 of 58
Quote:
Originally Posted by dongringo View Post
So, would you say a hybrid like EF5 or Trends PA-10 should be good for RS1i AND DT880/600? I would be using a D4 dac. Also, would a hybrid be considerably 'warmer' than the D4 amp?
With the RS1i, yes. With the 600 ohm Beyers, hard to say - depends on how much power into 600 ohms is available. And as for being warmer - that will also depend, although with a Hybrid, you will have some ability to tailor the sound by tube rolling.

Quote:
Originally Posted by peanuthead View Post
In my experience, transformer coupled tube amps also do a very good job with Grados.
Indeed - this is a good way to lower the output impedance, and as such solve that issue. The flipside is that a good sounding output transformer is usually expensive.
post #32 of 58
Quote:
Originally Posted by jcoops16 View Post
How about a Doge 6210-II
Thanks! I checked on this one and the Mapletree and both are ok to drive impedances of 30 - 600 Ohm, while the WA6 is good for 8 - 600 Ohm, thus should be good for Denons, Grados and everything I will ever own. If it wasn't for the wallet thing...
post #33 of 58
Quote:
Originally Posted by Skylab View Post
With the RS1i, yes. With the 600 ohm Beyers, hard to say - depends on how much power into 600 ohms is available. And as for being warmer - that will also depend, although with a Hybrid, you will have some ability to tailor the sound by tube rolling.



Indeed - this is a good way to lower the output impedance, and as such solve that issue. The flipside is that a good sounding output transformer is usually expensive.
Thanks alot to you and everyone else who has helped me. You all are awesome. I've learned so much here and just love this forum. My decision has been made. I'm going for the WA6 due to the versatility. I have some stuff to sell on Craigslist to fund it.
post #34 of 58
I'm a newbie to Woo...heh. Just got a WA6 on the forums, and it's a beautiful amp for my HF-2s. I just need to get an adapter so I can plug my ATs in for a listen!

DO THE WOO!
post #35 of 58
Quote:
Originally Posted by punkaroo View Post
I'm a newbie to Woo...heh. Just got a WA6 on the forums, and it's a beautiful amp for my HF-2s. I just need to get an adapter so I can plug my ATs in for a listen!

DO THE WOO!
Perhaps your nick should be punkaWOO?
post #36 of 58
There are some low impedance OTLs (20 ohm) out there with enough power supply to drive Grados.

Haven't seen a toaster in a while peanuthead, looks good.
post #37 of 58

Mapletree Amps

Might I recommend you look at Mapletree amps? The MAD Ear+HD is the best amp I have ever heard with my Grado RS1s! Many here who have heard this combination can back me up...magical is the word I would use. Absolutely ZERO hiss when using the 5751 driver tube.

I would only recommend the 12AX7 tube (30% more gain) for 100+ohm cans.

Now out of the high gain headphone output, my 600ohm beyer T1s sound amazing too with more than sufficient power!

To top it off, you get awesome customer service from Dr. Lloyd too!
post #38 of 58
Quote:
Originally Posted by dongringo View Post
Perhaps your nick should be punkaWOO?
Ha!
post #39 of 58
Quote:
Originally Posted by MacedonianHero View Post
Might I recommend you look at Mapletree amps? The MAD Ear+HD is the best amp I have ever heard with my Grado RS1s! Many here who have heard this combination can back me up...magical is the word I would use. Absolutely ZERO hiss when using the 5751 driver tube.

I would only recommend the 12AX7 tube (30% more gain) for 100+ohm cans.

Now out of the high gain headphone output, my 600ohm beyer T1s sound amazing too with more than sufficient power!

To top it off, you get awesome customer service from Dr. Lloyd too!
Curious, have you or anyone else in this thread heard the WA6 to compare to the Ear+HD?

Sorry OP, didn't mean to highjack your thread. It's all on topic though so it should help you as well.
post #40 of 58

My experience...

Quote:
Originally Posted by dongringo View Post
Curious, have you or anyone else in this thread heard the WA6 to compare to the Ear+HD?

Sorry OP, didn't mean to highjack your thread. It's all on topic though so it should help you as well.
I have heard the Woo2 with my RS1s as well, and I can say that I preferred the MAD Ear+HD and RS1 synergy by a good margin. I also have heard both with HD650s and they were both great!
post #41 of 58
Quote:
Originally Posted by dongringo View Post
Curious, have you or anyone else in this thread heard the WA6 to compare to the Ear+HD?

Sorry OP, didn't mean to highjack your thread. It's all on topic though so it should help you as well.
I may get flamed for this, but I listened to a pair of RS-1s through a MAD amp, and I wasn't blown away. Granted, I will say this: it was very neutral, and incredibly quiet.
post #42 of 58
Quote:
Originally Posted by punkaroo View Post
I may get flamed for this, but I listened to a pair of RS-1s through a MAD amp, and I wasn't blown away. Granted, I will say this: it was very neutral, and incredibly quiet.
Woo for you then? Sorry, couldn't resist.
post #43 of 58
Damn right.

LOL!
post #44 of 58
Quote:
Originally Posted by Skylab View Post
There are two very valid technical reasons that OTL tube amps are not an ideal match on paper for low impedance headphones:

1. The output impedance of most (but not all) OTL tube amps is high-ish - output impedances of 40-60 ohms are not uncommon. Running a 25 ohm headphone off a 50 ohm output impedance is definitely not ideal.

2. Low impedance, high sensitivity headphones want a lot of current swing, but don't require a lot of voltage. SS devices are generally better at delivering current into lower impedance loads. Tubes are, again very generally speaking, better at voltage swing, and less good at current delivery. Frank Van Alstine, a very talented audio guy who prefers tube-ss hybrid designs for amps, prefers them because he considers the vacuum tube an ideal voltage source, and SS devices an idea current source.

There is also the fact that a high-sensitivity headphone will be less forgiving of even very low level hum, which some cheaper tube amps do have.

So there are good reasons for people stating the mismatch.

That said, I have found the Decware CSP-2, an OTL tube amp, to work well with low-impedance Denons, and I like the RSA Stealth, an OTL tube amp, very much with the medium-impedance JVC DX1000. So the proof is in the listening and the ear of the beholder, and there are no absolutes.

That said, if I was a committed Grado person, I would probably not make a foray into OTL tube amps. For me personally, being a 600 ohm Beyer guy mostly, owning a bunch of OTL tube amps is a pleasure
Thanks for the clear explanation, Skylab. Makes sense (finally!) to me.
post #45 of 58
well..my RS1 are going nicely with my OTL earmax pro,but it may be that the earmax is not driving them to their full potential due to the bad combination of OTL design with low impedance.
I just thought of something...would increasing the impedance of the grados can improve the situation? do any of you know how this can be done?
I remember the problem with the COWON D2 player and the low impedance PK2 earphones, people suggested to use some sort of impedance adapter for increasing the impedance and solve that problem, i just though that maybe it can be a good solution for those who want to use OTL amps with low impedance cans.
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