Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

AKSA Builders of market proven kits and modules at sound quality to rival the best in high end

Reply
 
Thread Tools Search this Thread
Old 7th November 2016, 10:19 AM   #1
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Default The AKSA ' 'TLP' - a great solution to a digital issue! :-))

The 'TLP' is a tube buffer which Hugh produced before he developed his GK-1 preamp ... which then led on to the GK-2, which I have. So it's a product from long ago ... which languished, after the GK-1 came out.

Now, I have just dipped my toe into the digital waters ... replacing the 3-way analogue active XOs I've been using with my Maggies for 15 years with a miniDSP unit (10x10Hd). I did this because I added a pair of subs to my Maggies, so:
1. I needed a 4-way XO, and
2. I needed to use DSP to delay my Maggies, to line up with the subs which are about 1.3m further away from my ears.

As a result, I have just bought 2x TLP kits!

Now, my system currently is: sources --> GK-2 --> miniDSP --> power amps.

The beauty of the GK-2 is that it has 2 outputs:
1. the ss (sub) output. (This bypasses the unity-gain tube output stage of the GK-1/GK-2.)
2. the tube output.

If you are running active speakers, it is a well-known fact that you should feed your woofers from the 'sub out' and your tweeters (& mids) from the 'tube out'. The reason is:
* ss out gives better definition of the leading edge of bass transients (than the tube does), and
* tube output gives a more entrancing delivery of mids & HFs than the sub out does.

So currently:
* my sub out feeds subs + bass panels, and
* my tube out feeds mid panels + ribbons.

This is fine ... but as the next component in the signal chain is my miniDSP unit, it is possible I don't hear the full beauty of the 'tube out' coming from the speakers that I did when I had analogue active XOs?

So I am going to re-arrange my component chain and remove the GK-2. This is not a simple exercise as I need to have:
* source selection, and
* volume control.

My component chain now becomes:
* phono stage ---> ADC
* 4x digital sources (phono ADC / CDP / DAB+ tuner / Foxtel box) to digital source selector (Audio Authority 1177A-1)
* output from 1177A-1 ---> miniDSP (digital input)
* 8x RCA outputs from the miniDSP 10x10HD ---> an 8-channel volume control (DIY "Relaixed", out of Holland)
* 8-channel output from the Relaixed volume control --->
-- 4 channels of TLP, for mids & ribbons ---> power amps
-- 4 channels direct, for subs & bass panels ---> power amps.

So, this way, I should really be able to hear the 'tubeyness' of the TLP, as it is directly feeding the mid & ribbon power amps ... in contrast to my current situation where, really, I am "listening to the sound of" the miniDSP output DACs (which cannot be very good, given the price of the miniDSP!).

I will report back when it's all come together!

Andy
  Reply With Quote
Old 20th November 2016, 08:04 PM   #2
Fitero is offline Fitero  Canada
diyAudio Member
 
Fitero's Avatar
 
Join Date: Apr 2007
I am curious to learn your impressions.
  Reply With Quote
Old 20th November 2016, 08:09 PM   #3
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by Fitero View Post
I am curious to learn your impressions.
Sorry, Fitero ... "listening impressions" won't happen for about 6 months!

Andy
  Reply With Quote
Old 18th October 2017, 07:59 PM   #4
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
No listening impressions, yet, but the 2 TLPs are built and tested with sig-gen and CRO ... they are working to spec.

I will add a pic, later.

Andy
  Reply With Quote
Old 19th October 2017, 06:55 AM   #5
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Pic is here ... the space in the middle is for my 2 RelaiXed PCBs - which give me an 8-channel, digitally-controlled analogue volume control.

These 4 channels are for mids & ribbons - they are fed by one of the Relaixed boards. Subs & bass panels are fed directly from the other 4-channel Relaixed board.

Andy
Attached Images
File Type: jpg RelaiXed-TLP 02.jpg (861.8 KB, 362 views)
  Reply With Quote
Old 19th October 2017, 10:19 PM   #6
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Hi Andy,

I can see the custom EI transformers set up for the two TLP - four channel - preamps, what are the toroids being used for? Smallish, too, maybe 25VA?

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 20th October 2017, 05:08 AM   #7
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by AKSA View Post
Hi Andy,

I can see the custom EI transformers set up for the two TLP - four channel - preamps, what are the toroids being used for? Smallish, too, maybe 25VA?

Hugh
Hi Hugh,

Each powers 1 RelaiXed 4-channel volume control board. Yes, I think they are 30VA.

There is a 3rd small toroid mounted on the case side - this powers the digital control circuit.

Andy
  Reply With Quote
Old 13th February 2018, 05:43 AM   #8
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by Fitero View Post
I am curious to learn your impressions.
Well, it's taken 14 months - not 6! - but I finally listened to the new setup, yesterday!

First impressions are:

* it sounds great!
* but I can hear some hash on the mids & ribbons - not hearable at the listening position but certainly noticable when your ear is right at the driver. I was afraid this might happen so I think I know how to solve this problem. (Put an earthed shield over the 6v & 15v feeds from the power transformers that run close to the I/O wiring, on the other side of the steel divider between transformers and signal boards).

Monday is the "real test" - when my panel of 'golden ears' (including Hugh) comes round for a listen.

Pics attached.

Andy
Attached Images
File Type: jpg RelaiXed-TLP Front.JPG (436.0 KB, 230 views)
File Type: jpg RelaiXed-TLP Back.jpg (486.9 KB, 224 views)
File Type: jpg RelaiXed-TLP Top.jpg (818.0 KB, 221 views)
  Reply With Quote
Old 14th February 2018, 04:57 AM   #9
meanman1964 is offline meanman1964  Belgium
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
Which tubes are you using ?
  Reply With Quote
Old 14th February 2018, 05:35 AM   #10
andyr is offline andyr  Australia
diyAudio Member
 
Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by meanman1964 View Post
Which tubes are you using ?
They are the standard ones which Hugh supplies. And because of the way I've had to configure the system, in the short term, I can't take the lid off, to investigate.

Do you have any recommendations?

Andy
  Reply With Quote

Reply


The AKSA ' 'TLP' - a great solution to a digital issue!  :-))Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB a TLP dcmutt AKSA 2 19th December 2012 02:28 AM
30 Years of Digital and the 92% Solution georgelouis Vendor's Bazaar 27 8th March 2012 01:00 AM
great digital filters? audiophail Digital Line Level 1 20th December 2010 04:35 PM
Digital USB Sound Card isolation - Ground looping noise removal solution sk1 Vendor's Bazaar 0 29th May 2010 07:43 PM
A digital volume control solution ybserge Chip Amps 0 4th December 2006 04:37 PM


New To Site? Need Help?

All times are GMT. The time now is 11:18 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki