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Advice on Tube amps.....

post #1 of 9
Thread Starter 

 

Looking to get into Tube amps but am having trouble considering the options as I have a 4.1 system and would like for the system to be able to handle it.

 

My current set up is quasi studio based with two JBL control 25's (soon to be 4) and a JBL SB subwoofer of the same range, using these as I have a few laying around from a record store I used to run.... they're currently going through a 2000w power amp made for clubs more than anything so I'm looking to gradually upgrade this to a sweeter sound. View is that most valve amps are made for 2.0 but the JBL's could be seen as large speakers with two cones and two tweeters each... am not sure how I would power the subwoofer. The experimental side of me is thinking of making a 2 - 4 ended phono jack set and having two amps which could handle the entire system, would have to consider how this would work... could consider two mono blocks and work on a way to have a seperate amp for the subwoofer.

 

Anyway, am looking toward china for the amps quite a few sellers on ebay etc selling from europe now... wondering if anyone can comment as I don't want to get my wires crossed.

 

Thanks

GL

post #2 of 9
Thread Starter 

Thinking this basically.... using mono blocks to handle two speakers on either channel and an amp to handle the subwoofer.... the signals from the audio devices are going through a Pre-Amp which is there mainly for the phono stage as I use a turntable and many of the phono preamps act as devices for various inputs to switch between as well as phono.

 

It might look crazy but that's be cause I am crazy .lol.

post #3 of 9
Quote:
Originally Posted by Goldlion973 View Post
 

Thinking this basically.... using mono blocks to handle two speakers on either channel and an amp to handle the subwoofer.... the signals from the audio devices are going through a Pre-Amp which is there mainly for the phono stage as I use a turntable and many of the phono preamps act as devices for various inputs to switch between as well as phono.

 

It might look crazy but that's be cause I am crazy .lol.

 

Connecting your speakers in parallel like that to a single amp will halve the impedance to a nominal 4 ohms. Usually tube amps don't fare too well with low impedance loads (higher distortion at lower power output). You might be better off getting *four* monoblock amps - one for each speaker or just stick with two and use the other pair for a second system.

 

Also, if you want a subwoofer to move a lot of air, it needs a lot of power. You might want to stick with solid state for that. A tube amp usually doesn't have a low enough output impedance to effectively control a large bass driver anyway.

 

EDIT: One other thing to mention - perhaps all you really need is a tube preamp to add an extra touch of warmth to your setup.


Edited by yage - 1/24/14 at 12:31pm
post #4 of 9

Not saying it can't be done...more a question of should it be done ...

 

If you were to do it, the easiest would be

 

PREAMP (solid state) with SUBwoofer out

 

Two tube based stereo power amps

 

Pre-out on the preamp is y cabled - 1 pair to one tube amp, other pair to the other

 

Each tube power amp drives two speakers

 

Problem is...Why ? You would be getting dual stereo, not surround.

 

OR

 

Yage's idea

 

A sweet tube pre feeding a solid state power amp that can drive multii speakers...

 

Not sure of many tube pre's with sub out though

post #5 of 9
Thread Starter 

Am taking notes. Thanks for the insight guys.

post #6 of 9

I have a first hand for you

 

I have a Marantz SR4023 Receiver but also can be a pre-amp(it is being used that way rather than a receiver)

 

It feeds the Velleman tube amp I have but prior to that, I had it feed a Yamaha M65 Power amp. These things were incredible (can still be found) and could support up to 3 PAIRS of 8 ohm speakers at the same time

 

So picture that but instead of the Marantz, you had a tube pre with sub out. And a solid state power amp similar to my Yamaha.

 

drawback ? Good tube pre-amps can be pricey vs solids state pre and tube power amp

 

benefits

Tube goodness

solid state power amp puts out more juice so less worry on speaker input sensitivity which if I read correctly is 42db YIKES...that cant be right...but maybe..one tech sheet says 90db which is great..42db says you need POWER

 

Anyway, hope this helps...as for tube pre-amps

 

a friend of mine owns this business and is an INCREDIBLE resource...see this page for the pre's but he has lots of stuff and the knowledge is awesome...call jeff and tell him Rob from audioshark pointed you his way

 

http://www.avsolutionsca.com/Preamps.html

post #7 of 9
Thread Starter 

This is all making sense.... shame some of those amps your friend has are so expensive, am in the UK so tax and duty fees would finish me off before they even got to touch my ears.... so glad for forums like Head-fi, couldn't imagine not being able to talk with someone other than a salesman about these things.... considering my options, found it best to have mono blocks to go toward each speaker sticking with two JBL Control 25's for the moment so I don't get confused, the subwoofer I would then have powered by a solid state amp fed by a signal from the Tube Pre amp, I mean, if I want to make excuses for myself the bass is the least of ones concerns when it comes to a good sound **cough cough**

 

 

When introducing the other two speakers I would then consider another two monos to power them individually.

 

This isn't a surround sound system of course... think you've all reccomended the same way about it, which I think is what I've drawn?

 

Or having an expensive Tube pre amp that can provide power to the sub and signal to the second amplifer. The image option seems more affordable and better given the surround sound option, which wasn't an initial concern of mine until now. Only thing is that its not all tube and it'd be so cool having mono blocks going to each speaker, if not a bit much on the electricity bill .lol.

post #8 of 9
Thread Starter 

 

Ok... I'm sane... this guy is crazy .lol. Can hear the audio quality when he plays a clip of the film at the end, even through my laptop.

post #9 of 9
Thread Starter 

Pretty much my first foray into valve amps from solid state so this is what I'm going for, cheap and from china .lol.

 

**Uses humor to disguise embarrassment**

 

Phono/Pre Amp stage, has dual inputs so is convenient.....

 

 

Either.... Shengy PM150 hybrid mono amps....

 

 

Or. the Yaqin MC100B which is also mono powered per channel just houses in the same chassis...

 

 

Have also considered a Icon Audio Stereo40 MKIII

 

 

Costs a cool £2,000/£1,600 secondhand though.... for some reason I'm leaning toward the Shengy for power but its all about the tubes, leaning toward analogue as best I can so its likely going to be the MC-100b unless some further consideration can lean me toward this company based in the UK.

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