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post #106 of 311
Todd here is a link to a tube seller I have done business with before, good guy and honest
http://www.vacuumtubes.com/

I still would buy the tubes from Ray though as he can probably advise on each and the combo he feels is best. I would only buy from someone else if Ray did not have the tube ot you get some amazing deal.

Congrats on the amp and many happy hours listening.
post #107 of 311
Thread Starter 
Quote:
Originally Posted by jp11801 View Post
Todd here is a link to a tube seller I have done business with before, good guy and honest
http://www.vacuumtubes.com/

I still would buy the tubes from Ray though as he can probably advise on each and the combo he feels is best. I would only buy from someone else if Ray did not have the tube ot you get some amazing deal.

Congrats on the amp and many happy hours listening.

Ray recommended the combo of Telefunken 12au7 and Tung sol 5687's matched.

If someone has some or you see a good deal send me a PM!
post #108 of 311
Quote:
Originally Posted by Veniogenesis View Post
Thank goodness trose's headphones have an impedance of 600 ohms. Heh.
see. i don't really get this. the Raptor is an output transformer less amp, and it is said that OTLs by design are less capable of handling low impedance cans. however, i have listened to the Raptor on a few occasions and each time have used my RS1s and to me it was a wonderful combination. i know a lot of people have complained about the Woo 3 (another OTL amp) not being a good match with low impedance headphones, but is this a generally accepted principle or something that generally will vary.
post #109 of 311
Quote:
Originally Posted by vcoheda View Post
see. i don't really get this. the Raptor is an output transformer less amp, and it is said that OTLs by design are less capable of handling low impedance cans. however, i have listened to the Raptor on a few occasions and each time have used my RS1s and to me it was a wonderful combination. i know a lot of people have complained about the Woo 3 (another OTL amp) not being a good match with low impedance headphones, but is this a generally accepted principle or something that generally will vary.
Haha, so you like the sound of Grados out of the Raptor?
post #110 of 311

Raptor + Low Impedance Headphones

here are some relevant comments re raptor + low impedance headphones, just in case people are curious about the amp's ability to drive/handle these type of headphones.

Quote:
Originally Posted by Ray Samuels View Post
It is normal to have more volume (sound) /per volume knob turn when using high impedance headphones like the Sennheise 600/650 with the tube OTL design amp. While you need more turn of the volume knob to accomplish the same level of sound when using the low impedance headphones like Grado. Now it is true also that the apposite happens when using the SS headphone amp. The high impedance require more turn on the volume knob to reach the levels of the low impedance headphones which do not require a lot of volume turn.
Hope made it clear... Ray Samuels
Quote:
Originally Posted by john_jcb View Post
I have had the opportunity to listen to the Raptor with many different headphones and I believe your statement may be taken in the wrong way. All tube amps behave in the same manner. All tube amps require a higher volume setting to drive low impedance headphones. High impedance headphones like the Senn 650's require a much lower volume setting than low impedance to achieve the same volume. As stated earlier Solid State amps exhibit the opposite; low impedance, low volume setting. high impedance high volume setting.

The key when evaluating a tube amp with low impedance cans is not the volume setting but rather the quality of sound at that setting. The Raptor sounded very good to me with low impedance Grados even though it took a higher volume setting. There are tube amps out there that really have a problem driving lower impedance cans. When a tube amp is having problems driving a headphone there is no mistaking the degradation in sound. The Raptor had no problem driving the Grados to higher sound levels than I find comfortable.
Quote:
Originally Posted by recstar24 View Post
The Raptor is an OTL design, without the aid of output transformers OTL tube amps naturally are abit more efficient with the high impedance than low impedance, its a better impedance match. And the 650 sings beautifully with the Raptor, in fact after I reviewed the Raptor and had to turn it in, it was hard for me to go back to the 650 without the raptor, the experience was so exhalting that the 650 did not sound the same after that experience.

For an OTL design, the Raptor does a great job driving the low impedances compared to some other OTL designs, which includes the eddie current HD-300, Skorpion HV-1, and Antique Sound Labs MG OTL. A lot of these OTL tube amps suffer from a light, mushy type bass and lack extension at the extremes due to the impedance mismatch of the high output impedance of the tubes going into the low impedance of the cans; however,the Raptor in my experience drives the Grados with authority, great extension, very percussive and chest hitting bass, silky highs that extend up and above the whole upper harmonic series, with the great mids that one would expect from one of Ray's products.
Quote:
Originally Posted by Ray Samuels View Post
The Raptor does not & will not chug with HP-2 or any headphone you drop on it, this includes the hard to drive K1000, to a very comfortable listening levels. But, all tube amps which are made out of pre-amplification tubes in the OTL configiration, will drive the high impedance phones to higher levels at less turn of the knob, though many can not make it with the low impedance hard to drive Grados. The Raptor drives ALL low impedance phones with ease, to ear bleeding levels of listening, due to the drive capability of the 5687 output tubes. The only thing the low impedance require is more turn of the knob to get to those levels of sound.
Ray Samuels
Quote:
Originally Posted by Ferbose View Post
I recall the Raptor drove Grado RS1 with ease.
So I don't think Raptor has any difficulty driving low-impedance cans.
To my ears I like Grado with SS amplification for rock, although most of the times I am a tube guy. But that's just me and I know I hear Grado very differently from most poeple. For example, I don't think Grado is bright but actually think it has recessed extreme treble. I do recall that I liked jazz more on RS-1 than HD650 driven by SR-71. YMMV.
Quote:
Originally Posted by donlin View Post
I hope that nobody has the impression that the Raptor does not work well with Grado's. I have been using the Raptor with Grado RS-1's for 3 months and I think it is by far the best amp for Grados. It also works very well with HP-2's. I have been listening to Grado's for almost 15 years with many good amps and the Raptor is a perfect match. I think it is a good thing to have a little more range on the volume knob. I usually have the volume between the 9:30 and 10:30 position.
Quote:
Originally Posted by tyrion View Post
I've been using my HF-1's, which just arrived, with my Raptor for the last couple of hours and it drives them easily. It does take a bit more of a turn on the volume knob to achieve the same volume level of my 650's. I am listening comfortably at almost 10:00. With my 650's I would be at just about 9:00. There is plenty of detail, nice punchy bass.
post #111 of 311
I use a DT-880, an R-10, a pair of UE-10's and an HD600 out of the Raptor, all with favorable results.

I've previously owned a very expensive VT-231 (6SN7's) headphone amp and it couldn't handle the R-10's or my Grados at all.


...and yet, something as simple and cheap as an RA-1 powered the R-10's effortlessly, but disliked the Senns.

Now, most Head-Fi related manufacturers all have gain switches on their offerings so you are not locked in to dedication. I haven't heard any real deterioration when using a gain on my higher impedance cans, so there are a lot of choices.
post #112 of 311
Thread Starter 
I am suprized the UE-10's sounded OK. Ray told me that he didnt find the Raptor favorable with the UE-10's

He said "Tubes and Iems dont play well together"

Dunno, but I will post my results

Quite a large spectrum for UE-10's to 600ohm Beyers
post #113 of 311
trose:

you don't have any grados?
post #114 of 311
Thread Starter 
No can you believe that I have never even tried a pair. I hope to change all that at the NY meet.

I have had Ultrasone 650 pro, HD600, Darth Beyer Open's, DT880's (600ohms) and the DT990's (600ohms).

IMO the DT990 (600ohms) have earned the right to remain in the stable. I was quite fond of the HD600's as well and will someday pick up another pair.
post #115 of 311
$8,600 and not one grado. amazing.

there will definitely be some at the NY meet (i plan to go as well). now that you have an OTL amp, you should consider an HD600/650. they should sing.
post #116 of 311
Quote:
Originally Posted by vcoheda View Post
$8,600 and not one grado. amazing.
That's a crying shame, especially knowing how much you are into blues. Get some RS-1's and be done with it. Besides, I think Billy has a pair...
post #117 of 311
Thread Starter 
Quote:
Originally Posted by Pete7 View Post
That's a crying shame, especially knowing how much you are into blues. Get some RS-1's and be done with it. Besides, I think Billy has a pair...


LMAO!
post #118 of 311
Thread Starter 
Someone tell Billy I have a can of premium silver spray paint on the FS forum!
post #119 of 311
Thread Starter 
Can any other Raptor Owners list some favorable tube roll options?
post #120 of 311
Favorably speaking substitute 2 Phillips 5687WB in the front!

...and instead of a 12AU7, substitute a Phillips 5814A.
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