Search found 83 matches

by karatestu
Tue Jan 21, 2020 3:12 pm
Forum: Solid State
Topic: DIY Transistor Amp Using NVA Boards
Replies: 137
Views: 20655

Re: DIY Transistor Amp Using NVA Boards

I’d like to put three power supplies on it, but I’m not going to do that. I reckon I’ve got away with what I’ve done so far, by the skin of my teeth, and these boards are precious to me. As far as I am aware, only myself and Stu have had them as bare circuit boards, to be DIY powered; so in that se...
by karatestu
Mon Jan 20, 2020 7:24 pm
Forum: Solid State
Topic: DIY Transistor Amp Using NVA Boards
Replies: 137
Views: 20655

Re: DIY Transistor Amp Using NVA Boards

I’m well impressed with the sound quality improvement over the A20. Multiple power supplies are in. :) I have heard a couple of reports of preferring the sound of a single psu. I am firmly with you on this one :D As there is no pot to change the bias then there is no inclination to bias it more in ...
by karatestu
Thu Sep 26, 2019 3:47 pm
Forum: Beginners
Topic: Speaker cables (different send & return)
Replies: 5
Views: 1342

Re: Speaker cables (different send & return)

Sorry, my terminology has been bad. Send & return, positive and negative are just incorrect terms you pick up on the web and labelling on the back of amps. Hi Ed. Yes those are the ones. I don't use them anymore (replaced by NVA LS6). Just looked back at the posts on PFM from over a decade ago and m...
by karatestu
Wed Sep 25, 2019 5:17 pm
Forum: Beginners
Topic: Speaker cables (different send & return)
Replies: 5
Views: 1342

Re: Speaker cables (different send & return)

Paul Barker wrote:
Wed Sep 25, 2019 5:02 pm
There is no send and return there is a waveform equally reliant on both cables’ quality.
Thanks for the reply and putting that little notion to bed :D Coax speaker cables are obviously different though in the positive and negative (my Avondale blacklink is coax.

Cheers, Stu
by karatestu
Wed Sep 25, 2019 4:56 pm
Forum: Beginners
Topic: Speaker cables (different send & return)
Replies: 5
Views: 1342

Speaker cables (different send & return)

Hello, I had a thought today about speaker cables. Is the quality of the send (positive) wiring more important than the return (negative) wiring? Or are they both equally important ? Say you used a very high quality send cable and a much cheaper return cable (this assumes send and return are separat...
by karatestu
Fri Aug 09, 2019 11:23 am
Forum: Computer Audio
Topic: Digital.
Replies: 55
Views: 9454

Re: Digital.

I only use Cd players. Heavily modified Naim CD3.5, Cambridge Audio CD5 and Sony CDPS1.

We have itunes on the pc but i very rarely bother with it. I am a keep it simple kind of guy. No external dac's, digital cables or anything.
by karatestu
Fri May 31, 2019 7:57 pm
Forum: News
Topic: Richard Dunn RIP
Replies: 5
Views: 1832

Re: Richard Dunn RIP

Very sad, although i have known for a while. I am going to miss him .
by karatestu
Tue Oct 23, 2018 8:27 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

Thanks for your input Wolfgang. I am not adverse to putting in a buffer and will eventually try one i think.

As far as the article goes, i dont know enough to say if its right or wrong. Just thought it may prompt some discussion from you more learned members.

Cheers, Stu.
by karatestu
Tue Oct 23, 2018 3:45 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

Anyone fancy casting an eye over this. Shows one channel of dac, dc blocking, volume control and input stage of power amp. I have not included the capacitance, resistance and inductance of cables etc cos I don't know what they are. Anything I can improve on (except reducing coupling cap value) ?????...
by karatestu
Tue Oct 23, 2018 2:51 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

Just read https://www.soundstageultra.com/index.php/features-menu/general-interest-interviews-menu/311-what-s-wrong-with-digital-volume-controls Puts me off digital volume control but then I know naff all about it. Preamps are to be avoided if possible - when I removed my Avondale preamp board it wa...
by karatestu
Tue Oct 23, 2018 2:10 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

TDA1305 Dac chip definitely has 2.5V DC on its output. I just checked again.

So I cant get rid of the coupling cap :( Can still lower it to 1uf and not have audible bass roll off ?
by karatestu
Mon Oct 22, 2018 7:27 pm
Forum: Beginners
Topic: Cathode follower buffer
Replies: 10
Views: 2943

Re: Cathode follower buffer

Oh, sorry Ed. Have not checked email recently. Yes i would still like it.

Money will be sent tomorrow.

Many thanks, stu
by karatestu
Mon Oct 22, 2018 7:19 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

I thought so. Thanks for clearing that up Nick. I will keep the dac as is. I already pimped up the decoupling and vref cap with oscons years ago. Gave each power supply pin (3 of) its own psu and pfm flea reg on the most important one and a sprinkling of capacitance multipliers. Next thing i will do...
by karatestu
Mon Oct 22, 2018 3:02 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

Well I could do that I suppose. I have found the i2s lines (Bitclock, wordclock and data) between SAA7376 decoder chip and TDA1305 dac chip.

Its a lot of buggering about though. :roll: What do i need ? Some sort of SPDIF chip ?

Stu
by karatestu
Mon Oct 22, 2018 2:49 pm
Forum: CD
Topic: CDP / DAC output stage
Replies: 27
Views: 10009

Re: CDP / DAC output stage

Hi Wolfgang, I am pretty sure it has 2.5V DC on the dac output but then I might have measured wrong with my DMM. I agree that no cap is best if possible to do so. I will measure again. NVA amps are like no other solid state amps I have come across. Richard Dunn the designer states that he intentiona...