Hybrid Amps vs. All Tube and Tube pre/SS amp vs. tube amp

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simon wagstaff

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Re: Hybrid Amps vs. All Tube
« Reply #40 on: 26 May 2012, 01:09 pm »
"You have no idea what you are missing man! The shift from my HT processor, to even a cheap tube preamp (a stock MAD 4SE), was shocking! The dynamics, the 3D sound...."

I hear this all the time but I am not convinced. I recently changed my set up to include a Denon AVR-100 and the BD-A100 blu ray player. They are connected via Denon link iv so i am not using HDMI.

This set up provides an incredibly wide, 3-D soundstage, a huge bubble of sound that emanates from the front of the room. Now, I haven't done a direct A/b comparison but I do like to have the room correction and bass management as part of the package. I do suspect that the difference between a good pre-amp and the Denon as a processor might be there, but not as amazing as some suggest.

Of course, part of the package is my U70 driving the front speakers. After many years of a high level of satisfaction with my Infinity IM 4.1 I came into some cash and decided to go for something new.

I picked up a pair of Volent Paragon VL-2 stand mounts. I am driving them very nicely with my U70. Even though the sensitivity is not nearly so great as the IM 4.1 i get very satisfying levels, maybe greater than with the Infinities.

However, the Infinities I drove full range with the U70, they have built in sub amps so the majority of the load was handled by them but they were still being driven bu the U70. the Volents I cross over at 80 hz so the U70 is bandwidth limited, it really seems to have a lot of ooomph when set up this way. I have a pair of VMPS smaller subs that I drive with a stereo 250 watt SS amp.

The ribbon tweeters are nice and mate well with the U70 but what really surprised me was the new definition and detail I get in the bass, lots of tone that I hadn't heard before.

Was listening to the MoFi of "The Yes Album" last night, a quite remarkable bubble of sound projected into the room, wall to wall.

I am sure more watts might get me better dynamics, but right now it will play as loud as I could ever want (or that my wife will allow me).

yep, still love my U70 and am somewhat surprised at how well it drives the Volents, at least from 80 hz on up.

pstrisik

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Re: Hybrid Amps vs. All Tube
« Reply #41 on: 26 May 2012, 02:03 pm »
One question that came up for me regarding HT bypass....  When using the AVR for HT, does the preamp have to be turned on?  Most, if not all, preamps with HT bypass, have a switch to change between preamp and bypass.  Makes me think the pre has to be on to make the switch active.  If it was possible, it would make more sense to me to have the pre bypassed when off and active when on.  Would make the tubes last longer.  What's the case?

.............Peter


Heads up on a transcendence 8 on ebay: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=180892432862&ssPageName=ADME:B:SS:US:1123.  Too bad the T8 doesn't have HT bypass. :cry:  This one has phono and remote, too.

avahifi

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Re: Hybrid Amps vs. All Tube
« Reply #42 on: 26 May 2012, 10:28 pm »
AVA preamplifiers need not be powered on when the HT Bypass switch is set in the bypass mode.  This bypasses everything in the preamp except the necessary switch contacts.

However if the Buffered Tape Output option is included, then the preamp will need to be switched on to energize this circuit.  The bypass wiring comes after the tape outputs so the Tape Buffers are in circuit with this option.  This is not a bad thing.  The buffered tape outputs will also isolate the preamp section of your HT processor (probably a pretty anemic circuit) and provide excellent drive current to the amplifier downstream.

Regards,

Frank Van Alstine

pstrisik

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Re: Hybrid Amps vs. All Tube
« Reply #43 on: 26 May 2012, 11:29 pm »
Thanks Frank.   Good to hear that it doesn't have to be powered on to watch a movie or TV.  Some models out there do have to be on.

Was there a transcendence eight?  The eBay listing I linked isn't clear about the model.  It looks current but I'm not sure. 

I've gotten confused as there is no mention of HT Bypass on the T8+ page or on the price list.  There is no reference to the remote option on the T8+ page, only on the price list.  And a photo of the back of the unit would be helpful.  - Just some viewer feedback.  :)

Is the HT Bypass an option or standard?

.........Peter

jerryleefish

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Re: Hybrid Amps vs. All Tube
« Reply #44 on: 27 May 2012, 12:20 am »
In reference to needing to change power tubes 4 to 5 year. I 've been running
Luxman 3045 (4) for 25 years and don't find any sonic degregation.The 3045 is tube only. I think whats important here is bias balance in a push pull circuit. An imbalance which causes excessive cathode current  greatly decreases tube life and can damage the output and power transformers. I check bias every time I power up. Not only do you protect the OP circuit you optimize the sonority.

I also take exception to needing 100 plus watts in tube amps. Power requirements are predicated by speaker effiency,music being played, and how you drive your speakers. I use horns and play classic music at modest levels. My amps are rated at 40 Watts. I doubt they ever put out ten.   

Tone Depth

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Re: Hybrid Amps vs. All Tube
« Reply #45 on: 27 May 2012, 06:13 am »
Preamp HT Bypass option:  http://www.avahifi.com/index.php?option=com_content&view=article&id=268&Itemid=255

Transcendence 8+ is T8+:  http://www.avahifi.com/index.php?option=com_content&view=article&id=70&Itemid=206

Thanks Frank.   Good to hear that it doesn't have to be powered on to watch a movie or TV.  Some models out there do have to be on.

Was there a transcendence eight?  The eBay listing I linked isn't clear about the model.  It looks current but I'm not sure. 

I've gotten confused as there is no mention of HT Bypass on the T8+ page or on the price list.  There is no reference to the remote option on the T8+ page, only on the price list.  And a photo of the back of the unit would be helpful.  - Just some viewer feedback.  :)

Is the HT Bypass an option or standard?

.........Peter


avahifi

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Re: Hybrid Amps vs. All Tube and Tube pre/SS amp vs. tube amp
« Reply #46 on: 29 May 2012, 02:26 pm »
The HT Bypass switch is a $50 option on any new AVA preamplifier, or a $100 retrofit on most older AVA preamps.

Frank

mrlittlejeans

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Re: Hybrid Amps vs. All Tube and Tube pre/SS amp vs. tube amp
« Reply #47 on: 20 Jun 2012, 01:58 am »
I got the used Omegastar 500 Frank had for sale and had it upgraded to Insight + status.  I got it tonight and put it into the system.  All I can say is wow. 

It is replacing a Parasound Halo A21.  I read some comments about someone comparing a Parasound something to one of Frank's amps and it being no contest - the AVA amp killed it.  Needless to say, I was skeptical.  I shouldn't have been.  The clarity and smooothness I'm experiencing now is a revelation.  I never really believed amps could make such a difference.  I do now. 

Related equipment is a Vision DAC, squeezebox touch, Audible Illusions L3 and some Philharmonic 2's at the moment, soon to be replaced by some Magnepan 3.7s.

rajesh

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Re: Hybrid Amps vs. All Tube and Tube pre/SS amp vs. tube amp
« Reply #48 on: 9 Jul 2012, 01:17 am »
This thread on another forum would probably give you a different perspective: http://www.hifivision.com/amplifiers/27301-tube-light.html

Minn Mark

Re: Hybrid Amps vs. All Tube and Tube pre/SS amp vs. tube amp
« Reply #49 on: 10 Jul 2012, 01:22 pm »
@mrlittlejeans,

I own an AVA Insight 440H amp into Maggie 3.6R's. I also have AVA SS pre-amp and AVA DAC.  You will be very happy with this combination with your new 3.7's.


Happy listening,

Mark