Canuck Audio Mart Hifi and Audio ForumCanuck Audio Mart Hifi and Audio Forum
It is currently Thu Dec 14, 2017 5:19 am

All times are UTC - 8 hours




Post new topic Reply to topic  [ 11 posts ] 
Author Message
PostPosted: Thu Nov 23, 2017 12:03 pm 
Offline

Joined: Sat Dec 08, 2007 4:04 pm
Posts: 49
Location: Toronto, ON, CA
Hi. I wrote here before that my 100 w/pc NAD didn't seem quite ballsy enough to drive my Proac Response 3's.
I have the chance to buy and Acoustat Trans-Nova Twin-200 (TNT-200) Power Amplifier.
Does anyone know if it will drive the Proacs?

My pre amp is 2 piece Alchemist Forseti APD21A Pre Amplifier, the Tim Di Paravicini model.

The NAD is okay, but doesn't appear to hang on to the bass notes very well and sounds like it is going to run out of power.

Any suggestions or ideas would be greatly appreciated.

Thank you.

Joe


Top
 Profile  
Reply with quote  
PostPosted: Thu Nov 23, 2017 4:26 pm 
Offline

Joined: Tue Oct 11, 2005 2:12 pm
Posts: 641
Location: Waterdown, ON, CA
retiredelectrician wrote:
Hi. I wrote here before that my 100 w/pc NAD didn't seem quite ballsy enough to drive my Proac Response 3's.
I have the chance to buy and Acoustat Trans-Nova Twin-200 (TNT-200) Power Amplifier.
Does anyone know if it will drive the Proacs?

My pre amp is 2 piece Alchemist Forseti APD21A Pre Amplifier, the Tim Di Paravicini model.

The NAD is okay, but doesn't appear to hang on to the bass notes very well and sounds like it is going to run out of power.

Any suggestions or ideas would be greatly appreciated.

Thank you.

Joe


Yes sir. Providing the transnova is operating within spec it will have a very easy time driving your response 3's......... The response 3's are relatively easy speaker to drive. [fabulous speakers BTW]
Lived with a pair of response 3's for more than a decade and powered them with numerous amplifiers from both tube and quality solid scrape.
I should qualify things here... I am a dedicated tube guy and never paired my response 3's with anything from Nad but had numerous quality ss amps for comparison..... Mark Levinson ML2 monos, Classe Dr3 VHC, Krell 50 and 80, Pass Aleph etc. which I used to power a pair of acousat 2+2 and acoustat 3's [still have the Acoustat 3's]
I used the transnova 120 with the 2+2's but paired it with the Proac 3's on numerous occasions.

You have a very fine system there my friend.


Top
 Profile  
Reply with quote  
PostPosted: Thu Nov 23, 2017 6:04 pm 
Offline

Joined: Tue Sep 30, 2008 5:51 pm
Posts: 473
Location: Mississauga, ON, CA
A TNT-200 should have no problem with the ProAc's given it is running to spec.
Its a full FET design front to back so should give you a touch of tubes but with
plenty of control of the bass drivers.

Nice amp by the way..I have been looking for one as I had two TNT-200's
back in the '80's. I have a thing for MOSfet amps.

Matt tubeornotube


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 3:55 am 
Offline

Joined: Sat Dec 08, 2007 4:04 pm
Posts: 49
Location: Toronto, ON, CA
Hi Tubeornotube and Ecclectique.

Thank you both for your thoughts. Much appreciated.

As I said I have a chance of picking up a TNT 200 and have done some reading about this amp.
My concern is (now more than before) since you both said "as long as it is running to spec" what if it isn't? Before I buy it, due to it is coming from far away, there is no way I can get it to a technician to have it tested. If it isn't running to spec, what is it going to cost to bring it up t spec? AND. Is there some reason why you both made the same statement? I have bought amps before and asked for opinions here on CAM and no one has ever said "If it's running to spec"
I also read here about others in the same situation asking about "which amp to buy, or I have the chance to buy a BRAND X amp and I have never heard that statement before. (when people ask about Brystons or Krells or PS Audio or Naim or Levinson or Bedini etc etc,,,,,,no one ever makes that statement.

Am I better off taking my time and getting an amp where this is not a concern?

PS. I looked up the manual for the amp and Acoustic gave 2 warnings, one was about it picking up and possibly amplifying RF, the other was a HUGE warning about making sure the amp gets turned on AFTER the preamp, and turned off BEFORE the preamp. NOTE!!!! I always do this anyways, have done since my first high end system in the 80's,,,,,,but Acoustic talked about it almost as if there was an imminent threat of "the sky is going to fall" if this procedure is not followed.

So I suppose my final question is if the amp works and sounds fine is this "running to spec" issue still a concern?

(I may be able to have a friend who lives in Oshawa go and hear it before I paypal the money and have it shipped to Windsor,,,but if this "running to spec" concern is still an issue, then listening only may not be an assurance.)

It is 6 30 in the morning, no coffee yet,,,,,,so if I rambled on like ablating idiot, please forgive.

And again,,,,,thank you for your time and input.

Going for an espresso.

Ciao ciao


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 5:26 am 
Offline

Joined: Thu Jan 13, 2011 11:29 am
Posts: 499
Location: St.Catharines, ON, CA
The original Hitachi power mosfets are difficult to find and lots of counterfeits floating around.
Make sure output mosfets match.It's a "flying rails" power amp so don't operate like traditional power amps.
Hafler 9505 and some QSC amps are similar designs.
It's dated so don't pay to much.

Gary


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 8:48 am 
Offline

Joined: Tue Sep 30, 2008 5:51 pm
Posts: 473
Location: Mississauga, ON, CA
The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue

-- 24 Nov 2017 16:48 --

The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 9:02 am 
Offline

Joined: Tue Jul 05, 2005 3:09 pm
Posts: 1239
Location: Sherbrooke, QC, CA
Run Bambi, run!


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 9:13 am 
Offline

Joined: Tue Sep 30, 2008 5:51 pm
Posts: 473
Location: Mississauga, ON, CA
Most of those brands the OP mentioned
he is never warned about are serviceable..
especially Bryston..Krell would be very Costly
and Bedini, like Acoustat hasn’t existed for
many years. You take a chance with any vintage amp.
If you can accept that then buy the Acoustat.
I have always liked them

Matt


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 2:53 pm 
Offline

Joined: Sat Dec 08, 2007 4:04 pm
Posts: 49
Location: Toronto, ON, CA
Thank you to all who answered my thread.
The reason I was interested in the TNT 200 is that the seller was going to take my NAD 2400 Power Envelope and $200 cash for the TNT 200.
"Twas an easy swap as it were.

I feel I will wait a bit, sell the NAD and pick up something more up to date in the very near future.
Too risky otherwise.

Thank you all again for taking the time to respond.

JoJo


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 2:59 pm 
Offline

Joined: Tue Oct 11, 2005 2:12 pm
Posts: 641
Location: Waterdown, ON, CA
tubeornotube wrote:
The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue

-- 24 Nov 2017 16:48 --

The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue


Hi Joe.
RE: Operating to factory spec.

Tubeornotube said it best.

The amplifier is over 30 yrs old. Most solid state amplifiers of that vintage will require a power supply refurb sooner than later regardless of manufacture. However, If there is no hum to be heard at idle than you should be fine.

It would be in your best interest to ask the seller a few pertinent questions though:
- Is he is the original owner.
- Has the amplifier ever been serviced. If so. what was done and who did the servicing.
- As mentioned, the mosfet transistors are no longer made and if any or all of the original transistors have been replaced with a different output device then it is NO LONGER a TNT trans nova 200.

That said: If it is an original stock unit, have your buddy go for a listen. If there is no hum and it priced properly than go for it. You may need to adjust it's dc offset to meet factory spec but that a minor adjustment.
I would bet dollars to donuts it would make a better match with the response 3's than the Nad.







-

-- 24 Nov 2017 23:13 --

retiredelectrician wrote:
Thank you to all who answered my thread.
The reason I was interested in the TNT 200 is that the seller was going to take my NAD 2400 Power Envelope and $200 cash for the TNT 200.
"Twas an easy swap as it were.

I feel I will wait a bit, sell the NAD and pick up something more up to date in the very near future.
Too risky otherwise.

Thank you all again for taking the time to respond.

JoJo


Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 24, 2017 3:16 pm 
Offline

Joined: Tue Oct 11, 2005 2:12 pm
Posts: 641
Location: Waterdown, ON, CA
ecclectique wrote:
tubeornotube wrote:
The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue

-- 24 Nov 2017 16:48 --

The TNT-200 is from the early 1980’s.
So it is over 30 yrs old.
That being said it is a reliable amp and its circuit design is not over complicated.
However if it has been serviced it may not have proper
devices(output FET’s etc).
Basically parts are not obtainable.
It is a chance you take.
I have had these amps and know how to tell
if had been serviced or tampered with.
If you find one working perfectly and is original you
will have a gem of an amp.

Matt.....tubeornotue


Hi Joe.
RE: Operating to factory spec.

Tubeornotube said it best.

The amplifier is over 30 yrs old. Most solid state amplifiers of that vintage will require a power supply refurb sooner than later regardless of manufacture. However, If there is no hum to be heard at idle than you should be fine.

It would be in your best interest to ask the seller a few pertinent questions though:
- Is he is the original owner.
- Has the amplifier ever been serviced. If so. what was done and who did the servicing.
- As mentioned, the mosfet transistors are no longer made and if any or all of the original transistors have been replaced with a different output device then it is NO LONGER a TNT trans nova 200.

That said: If it is an original stock unit, have your buddy go for a listen. If there is no hum and it priced properly than go for it. You may need to adjust it's dc offset to meet factory spec but that a minor adjustment.
I would bet dollars to donuts it would make a better match with the response 3's than the Nad.







-

-- 24 Nov 2017 23:13 --

retiredelectrician wrote:
Thank you to all who answered my thread.
The reason I was interested in the TNT 200 is that the seller was going to take my NAD 2400 Power Envelope and $200 cash for the TNT 200.
"Twas an easy swap as it were.

I feel I will wait a bit, sell the NAD and pick up something more up to date in the very near future.
Too risky otherwise.

Thank you all again for taking the time to respond.

JoJo


Hey Joe.

If it were me. I would take the $200 and the tnt and take my chances. Your Nad is no spring chicken either.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group