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Author Topic: Best Amps for Sennheiser HD800  (Read 100596 times)

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EraserXIV

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Re: Best Amps for Sennheiser HD800
« Reply #320 on: March 19, 2015, 03:13:52 AM »

Very interesting, for my purposes as a stopgap, I think I will go for the Vali then. My HD800s are unmodded so if the Val2 is like the Magni2U, it might be too hard in the treble for me
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Freddy1201

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Re: Best Amps for Sennheiser HD800
« Reply #321 on: March 19, 2015, 04:16:15 AM »

I'd use a Magni 2 Uber over the WA22 anyday. There is like only person who hypes that thing because it's one of the few amps he's owned or listened to. Some Canadian with a black belt or something. Remove the WA22 from consideration. Heck you'd be better off with a WA6 than that thing.

Ok , wa22 is out lol
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schiit

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Re: Best Amps for Sennheiser HD800
« Reply #322 on: March 19, 2015, 04:45:27 AM »

I'm taking a similar path to EraserXIV.  Will be buying the Valhalla 2 with the intention of upgrading in the future.  While this might cost me more in the long run, it will take me a couple of years to save enough for an EC or DNA amp.  In the meantime, I am buying experience.

Have a question about tube rolling in the Valhalla 2 that I also pasted on another forum.  I figured the ratio of experts to novices would be more in my favour amongst the Pyrates, so will also post here:

Approached Schiit to determine if 6N30P can be used in place of 6N6P.  They responded very swiftly to the effect that they don't have much experience with tubes other than stock with Valhalla 2.

They kindly volunteered the following information though:

***The output tube on V2 is biased by a CCS (constant current source) feeding approx 6mA to the 6N6P anode with a plate voltage of about 100V.***  (my rewording)

I am guessing that the plate voltage of the output tube in this circuit is determined by the input tube (not sure - a little rusty).

Therefore, assuming that the anode current would remain 6mA on the 6N30P and the anode voltage 100V, perhaps someone with more knowledge than me could find a datasheet for this tube and determine whether or not it is operating at a suitably linear point.

My guess is that the circuit is optimised for 6N6P and, given that the curves are different, will not function as well with 6N30P in output position.

Please set me straight if my thinking is wrong.  I was considering investing in some 6N30P-DR tubes (for use in the DNA Sonett 2 at a later stage), but I doubt that V2 would see any benefit in using this type of tube.

Thanks

Nathan


Not the output tube bias. That's input tube bias. Output's about 35mA, set by a resistor. About 100V on each output tube (stacked) on a 200V supply.
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Lots o Schiit around here.

Marvey

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Re: Best Amps for Sennheiser HD800
« Reply #323 on: March 19, 2015, 05:12:36 AM »

True with stock tubes for sure. Some Amperex 6DJ8's can bring some tube warmness back,  but not too much gooey.

Yes, Amperex good tubes with some warmth. 7308 for warmer and rolled.
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EraserXIV

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Re: Best Amps for Sennheiser HD800
« Reply #324 on: March 19, 2015, 05:51:20 AM »

Jason any plans for a Vali 2 with updated chassis and preamp outs?
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jaffar

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Re: Best Amps for Sennheiser HD800
« Reply #325 on: March 19, 2015, 07:03:45 AM »

Please set me straight if my thinking is wrong.  I was considering investing in some 6N30P-DR tubes (for use in the DNA Sonett 2 at a later stage), but I doubt that V2 would see any benefit in using this type of tube.

Nathan,
the 6N30P is too different from 6N6P (needs higher heater current, etc). Hardly compatible.
It's better to roll the input tubes - they will have much bigger effect on the sound.
I've got excellent results with NOS Amperex 6922 + HD800.
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BleaK

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Re: Best Amps for Sennheiser HD800
« Reply #326 on: March 19, 2015, 10:22:01 AM »

walk the plank2

This is me walking the plank.  I have been suffering from depression and can't take judgement at the moment.  Mod, please cancel my account. 

Down to Davey's Locker I go    :&

Nathan

Don't sweat it dude, I too was wondering about tubes for Val2 :)

I have some hours on the Val2 now and I completely agree that it sound solid state like, only with some added warmth and very nice soundstage. The synergy with HD800 is really great! I was thinking about changing the tubes with some budget option and did some research. Ended up buying a pair of 60's Foton 6N6P and some 70's Reflector (I think) 6N23P-EV.

The Fotons arrived and after some 10 hours I noticed some subtle yet noticeable improvement. There's slight fuller lower midrange/upper bass, and the sound kinda tightened up. Really worthwhile upgrade for some cheap output tubes. Will post update when the Reflectors arrive, but overall I'm digging the Val2 sound.

(I can move this post to the Val2 thread if it clutters this thread)
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BleaK

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Re: Best Amps for Sennheiser HD800
« Reply #327 on: March 19, 2015, 02:53:27 PM »

Rag is interesting in that its smooth treble and technicalities are unsurpassed for a solid-state amp, this is good for HD800, but tonally Rag is lean in the bass with the HD800. One solution may be to add resisters in series to artificially bump up the Rag's 0 output impedance.

Huh, I wonder if it's possible to make the rag with two different balanced output. One with low output impedance for orthos etc, and another with high for Sennheiser/Beyers etc.
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Armaegis

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Re: Best Amps for Sennheiser HD800
« Reply #328 on: March 19, 2015, 04:03:47 PM »

Huh, I wonder if it's possible to make the rag with two different balanced output. One with low output impedance for orthos etc, and another with high for Sennheiser/Beyers etc.


Better to just stick a resistor in the path if you want that high output impedance.
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Marvey

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Re: Best Amps for Sennheiser HD800
« Reply #329 on: March 19, 2015, 05:17:48 PM »

Maybe I should wire up an HD800 high impedance adapter and sell it.
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