Biamp TK2050 with tube amp - any benefit ?

hillbear

Member
2010-03-23 8:57 pm
I have a Audio Innovations First 2A3 tube amp. Slightly faulty at the moment and will require service. I use this with Border Patrol PSU. I got a TK2050 from Hifimediy recently to keep me going until I got the First going again. Wow! This thing is superb - I use SLA batteries and quality stepped attenuator. Question is - do I stick with TK , get First sorted and then run in biamp mode ?? Say, the TK on bass , with tubes on midrange/high ?? Is it worth the hassle and expense. Shall I get another TK for £25 and run biamp with that?? Any thoughts welcome !
 
I wonder if you would run into some timing issues with the TK being quite fast and the tubes not...just a thought.

BTW, I am wondering if it is worth it to spend $40-50 for a quality stepped attenuator or an AlPS is sufficient. Do you notice a significant improvement with the stepped attenuator?
 

SY

diyAudio Moderator Emeritus
2002-10-24 10:19 pm
Chicagoland
www.SYclotron.com
I wonder if you would run into some timing issues with the TK being quite fast and the tubes not...just a thought.

Transit times in amps are on the order of nanoseconds. And given the lowpass filter needed at the D amp's output, the bandwidths and risetimes won't be all that different anyway.

Using a separate solid state amp on the bass is one of the greatest improvements one can make to a tube power amp.
 

SY

diyAudio Moderator Emeritus
2002-10-24 10:19 pm
Chicagoland
www.SYclotron.com
If by "better" bass, you mean "higher LF cutoff, higher LF source impedance, and higher LF distortion," then yes, tube amps have better bass. And with increased intermod, that "better bass" helps to increase midrange distortion as well. Even better, the requirements for an output transformer to handle deep bass at power mean a larger core, so increased leakage inductance and much poorer HF performance. w00t!
 
Transit times in amps are on the order of nanoseconds. And given the lowpass filter needed at the D amp's output, the bandwidths and risetimes won't be all that different anyway.

Using a separate solid state amp on the bass is one of the greatest improvements one can make to a tube power amp.

Exactly, nanoseconds can introduce spatial effects. However, these can be pleasant in some circumstances, but you get away from accurate. I would try it though, this is just a consideration.
 

hillbear

Member
2010-03-23 8:57 pm
Thanks for your thoughts - I have tried various combinations of TK pot, sepearte pre-amp, stepped attenuators..etc. The best to my ears is to remove the TK pot and solder in a stepped attenuator (£20 from VALAB or the like from ebay). I think its worth the extra cost/effort.
 

SY

diyAudio Moderator Emeritus
2002-10-24 10:19 pm
Chicagoland
www.SYclotron.com
Speed of sound wave in air: 343.2m/s
Time taken for sound to travel 1cm: 29µs

Right, exactly. Now, what's the woofer displacement during the music- 1cm or so? That represents 29,000 ns right there.

At transit times of 10ns, this represents a speaker displacement of 0.003mm! I suspect that this isn't going to upset timing cues.:D
 

wwenze

Member
2008-03-07 12:46 pm
I was thinking... if the distances of the speakers from the listener's position was different by 1cm, it should introduce a lot of spatial effect. :D

Or on some speakers the tweeters are behind the woofer. Maybe that's why horns sound nice. Maybe not.

The depth of the cone is usually more than 1cm isn't it? Must be bad to have some parts of the sound from the same cone reaching 29µs late. Mmm... dome drivers anyone?
 
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Pano

Administrator
Paid Member
2004-10-07 6:05 am
Panama
Use the TK on the woofers, the 2A3 on the mids/highs. It's simple. Your ears, your soul and your dancing feet will thank you for it.

That's how I run my system and I've heard several world class systems that do the same. The Tripath amp may not end up being your ultimate choice for the bass, but the concept is good, very good.