top of the morning to you!

Can't help there.. I do not have bookshelves speakers BUT I can definitely bring speaker cables!

Good question there!

morning march..

that's better than nothing! BTW, how's the passive 100k pot pre-amp performing?

bro March,
Nice to know that! Yes.. there's always 'colorations' added by anything in the signal path, its a matter of it being balanced or not..
Looks like the CA640P definitely needs a preamp. Is this 'tube based preamp' a commercial unit? Or you got one stashed somewhere collecting dust..

Let's hope bsl will be reading this and make an offer to you!
He's busy this week yes?

Great! Your mood is back!
the coming TT is this afternoon!

My 'passive preamp' is a 100K pot which works extremely fine.. since you have a 50K ALPS, give it a go. It might worked!

Okay,
First some pics! Enjoy...

One of the sessions was in junchoon's 'lil audio room..
Equipments:
EPOS M16
Pioneer CDP
wui's T-Amp
My T-Amp
junchoon's friend DIY amp
bsl's tube pre-amp




Final session in the hall,
Equipments:
Pioneer DVD player as CDP
bsl's tube preamp
My T-Amp
wui's T-Amp
Zhaolu D2 DAC
Yamaha AV amp
Yamaha floorstanders




Closeup of the Zhaolu's DAc in action:




Closeup of the equipments in the 'lil audio room..

wui,
thanks for the effort! yes.. long one, eh?
We did try heavy rock with the soundstage tube pre-amp and my T-Amp.. it just doesn't have the right 'attack'... could be personal preferences or some limitations with the Yamaha floorstanders..
But, when partnered with the EPOS.. sweeeeet! especially the vocals..

The 2N5458 should be suitable.. not much diff. from 2N5457 I guess

This post has been edited by jazzy939: Oct 27 2008, 10:03 PM

Welcome to the club, cyl1000!
The general concensus is that the stock input caps should be replaced.
If you're into vocals, a Vishay/ERO 2.2uF poly would be excellent! What set of speakers would you be using btw? Get a good bookshelve speakers for this. We've seen this being demonstrated by March's HB2.
Replacement of the SMDs are also recommended.. see/download pdf guide at beginning of this thread.

I was initially running the T-Amp with a linear PSU. My review/findings at earlier pages.. In a nutshell, with linear PSU, the low end definition is excellent. But the SMPS really matches the T-Amp for overall performance in terms of control and dynamics.. more biased towards midranges and an increase in the operating voltage from 12VDC to 13.6VDC which I am running, improves the bass quite a bit, in terms of refined definition, very subtle but definitive. Again this is more to personal preferences, either way, the T-Amp is still a great performer!

Anyone else wanna add?


This post has been edited by jazzy939: Oct 27 2008, 11:53 PM

wui,
good work!
how does it sounds? pics?

wui,
Do like what I did when I did not have the relay board. Remove the speaker cables before powering off
BTW, before switching off the buffer, switch off the T-Amp first! Followed by the buffer.

Thump noise can be from the inrush currents/voltages, DC offset also probably.

Yes.. there are few soft start circuits.. just search for it and see whats suitable.. I did but found the relay solution would be more practical in my case.

I can take a look at it.. or ask the sifu. He's closer to your side.

BUT important question; How's the sounds like?

As you said it, it also depends on your setup to realize the difference if there are any at all.
YourT-Amp as it is,is quite well balanced, according to junchoon that is, and I am quite agreeable! Little improvements ay not be apparent at first, give it a few hours and a good intense listening should reveal any improvements or otherwise... remember the Zhaolu DAC D2?

Did you solved or temporarily solved the 'thumping' sound?

Wui, sounds like good idea! How soon can you make this? Errr too much free time before your finals, huh?

This post has been edited by jazzy939: Oct 28 2008, 05:51 PM

Y.C,
Why the trouble of sending it back, just ask, 'How much'?

Wahhh... 'Till death do us part' eh?

March,
If I were you, I'd do the same too...

They don't make speakers like they used to now.. eh?

Will look forward, hearing it again, probably performing with the T-Amp big brother, TA2022 with CA640p and a TT..

wui223,
any progress on your tubed preamp/buffer?

You still have problems with 'thump'ing sound when switching off?
Yes.. wish I had the time to build it first..

We are in 3rd page!

Ok. Was in JP this afternoon got this for RM4.50 a pair!
The pair was preinstalled on a plastic frame to be mounted on the speaker. Minor disassembly(two small screws) required..
Earlier gabanyayaya was looking for a similar one that Y.C. paid RM5.50 each..?

Y.C.,
yes knowing JP there are variations in quality and prices.. but on many occasions it's the same item!
I think mine is a different one, as yours, the threaded shank is 'extra long' which requires extra 'screwing'...
Anyway the moral of the story: shop around!

Here an example: I saw a unit that closely resembles what mysghooi was using as his T-Amp casing. One shop was selling it for RM99. Its a complete (portable)amplifier for the car. Operated by 12V. Saw another shop selling the same very unit for RM79! Now thats RM20 difference!

I also saw several units (small amplifiers) with minor modifications will make a very good looking T-Amp casing/assembly!

This post has been edited by jazzy939: Nov 1 2008, 07:48 PM

Was that ekool? Ooops!

Good news there Y.C. What value resistor that you used as the current limiter?

Are we in the mood for another TT Session?

This is the casing that I saw. pix from ekool's posting. exactly the same!

This post has been edited by jazzy939: Nov 1 2008, 08:04 PM

Ah.. the 10K resistor!

Yes. I think next week onwards would be excellent.
Will give me time to complete my buffer pre-amp too! Bought a few casings from JP this afternoon. One for Junior's T-Amp which was completed within half hour! He's now enjoying the T-Amp, will ask him for his review/findings. He's currently using the stock input caps. Will change the input caps shortly... He said the sound is a 'lil bit sharp for his taste...

This post has been edited by jazzy939: Nov 1 2008, 08:16 PM

wui,
how's your finals this afternoon? wishing all the best!

hey, how about a pix of your buffer? Your preview of the buffer you built is kinda 'too brief!'
damn!, that reminds me that I owe you a circuit for the JFET to get them matched.. ok will do that soon. Now busy replacing Junior's T-Amp input caps. We're using the ever famous F-ELNA!

Well, if anyone is interested, why not. With PCB, all etched, matched, ready to go!

This post has been edited by jazzy939: Nov 1 2008, 09:18 PM