Check my sales Site. i offer them as well
on the 1543 section to be precise ....
Oh dam
if I knew that I would have ordered with the new motherboard that just arrived. To help you increase sales
can I suggest you added it to the 1794 pages so customer don't miss it 
GOOD Point
I updated my web site immediately
Also part list is now updated and also the PDF for the DDDAC1794S can be downloaded
Existing customers who need a Tent Clock can order without shipping cost to make up
To avoid my bankruptcy
Wow that's kind!!
I will be ordering top man!! (Again)
Is anyone able to answer dwjames' interesting point?
Thanks
Thanks
Big thanks to Doede for a brilliant kit
Got a question though... If I'm using a standard non-balanced output and the dc offset across the positive and negative output pins is very low (less than 200mv) is there any reason why I shouldn't just wire my rca to these pins and do away with the coupling caps? Is this dc offset figure likely to change for any reason? A few guys are running their kits like this and reporting good results with only a very slight hum at very high volumes with no music playing. The best cap is no cap at all, right?
Thanks,
James
In general: DC on the input of your amplifier can blow up speaker units due to amplifying DC to a high level that will overload the speaker.
There is a risk depending on the amp. Most amps have an input capacitor to block DC so there you can leave the cap on the dac side out. Tube amps will (except for OTL) never put DC on the speakers because they use transformers, but the DC will influence the bias of your input tube, and is therefore not reccommended. Except if you use an input transformer that can handle DC like I do.
Hum is not induced by DC, so you will also hear that when coupling with a cap or trannie.
Normally The low DC output of the dac unit will not drift after it has burned in for a while, but if a chip damages the DC can go up to higher levels.
Using no cap sounds definitely better but it is entirely at your own risk!
When you build your own amps or are able to determine if it has a DC blocking input cap you can judge for yourself if there is a risk.
Regards,
If you mean with self biasing that the input tube uses a kathode resistor with parrallel cap: the dc from dac will be added to the tube bias. Depending on the absolute bias level compaired to the extra induced bias this might not be a problem.
Be aware that doing this is entierely at your own risk!
Do you have a schematic available?
That's exactly what I was going to ask about for my WD Kel84 amp with dc blocking caps between the input and output stage. Here's the schematic for that
That's exactly what I was going to ask about for my WD Kel84 amp with dc blocking caps between the input and output stage. Here's the schematic for that
With this design I would measure the voltages in the amp to find out what happens when you put DC on the input ( It's not my preferred tube amp type
)
With this design I would measure the voltages in the amp to find out what happens when you put DC on the input ( It's not my preferred tube amp type
Thanks, I'll get the voltmeter out and investigate. I'm quite sure this small dc offset between pos+neg won't make it to the speakers due to the coupling caps in the amp, it's just a question of whether it effects the voltages of that first tube in any bad way, but if it stays at the current level, hopefully we're all good.
