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DAC-ASH (dac-end 2 up date)

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Jogi

Jogi

Member
Joined 2008
Good is a very relative term...It always depends, sometimes a cheap cap at the right place can sound very good, and the §§§ cap like crap.
I tried at least 5 different caps and finally took some old german caps, KP1932, as I do not like Wima and Mundorf for example.
But it depends on your system, if it is more on the dark side, a Mundorf silver oil could be the ticket, or a russian teflon, or even a silver mica.
As i am listening with horns, those caps are sounding too bright and artificial to my taste.
I would stay away from oil caps in this place, although they might be the ticket for output coupling.
I always solder a piece of wire in place, and can easily try many caps without messing up the board through the heat. When I've found the right one, I take the wire out and solder the caps in place.
 
ernesternest

ernesternest

Member
Joined 2007
Paid Member
Current through 6n6p

Hi,

I'm changing from E182CC to 6n6p. With E182CC inside I press 15mA through each tube by using a CCS. How much juice should be sent through the 6n6p, or how much current does one tube suck through the anode resisors.

Btw, this is a perfect DAC :D

Thanks

Ernst
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
ernesternest said:
Hi,

I'm changing from E182CC to 6n6p. With E182CC inside I press 15mA through each tube by using a CCS. How much juice should be sent through the 6n6p, or how much current does one tube suck through the anode resisors.

Btw, this is a perfect DAC :D

Thanks

Ernst
Click to expand...

Hi! do you need use 6h6 or E182CC?
Not like use CCS, only use when you use one tube 6h6 or E182CC
it i mean 1/2 Tube for one channel output!
 
ernesternest

ernesternest

Member
Joined 2007
Paid Member
quanghao said:
Hi! do you need use 6h6 or E182CC?
Not like use CCS, only use when you use one tube 6h6 or E182CC
it i mean 1/2 Tube for one channel output!
Click to expand...

Hi, I know what you mean, but currently I'm using 2 peace of E182CC, each one fed with 15mA, just as Adamus and Andrea did. And btw with anode resistors in place they were sucking 15mA as well. This led me on that way and in my opinion the sound is very good. Btw, today in the evening I'll compare the one with CSS vs the same DAC without CCS. So we will see.

In a future application I want to try 6n6p (I'm reworking my second i/V board for that) just for fun. I want to know the sound of 6n6p. Since I don't want to setup this with anoderesistors first, I have no idea about the needed current. So please, if one measured, please let me know.

Cheers Ernst
 
ernesternest

ernesternest

Member
Joined 2007
Paid Member
nightanole said:
the 6n6p wants 20-25ma per side. Running traditional driver current of 5-10ma does not make them sound good. Think of both sides combined as a el84 and design as such.

Id love to see your setup of 6n6p. I love mine but im just using them as drivers for my el84 amp.
Click to expand...

Per side means one triode system wants to see 20 to 25 mA!?!
That is a lot juice, at about three times my E182CC setup currently sees. I have my shunt running at 80mA and after Salas I think 100mA would be max, that made 80mA max for the tubes. I'll test different current steps to find out best, but thanks for the number. Now I know that I have to raise my shunt current.

My setup is quite simple, in the end the same here show in the I/V Pre, built on the old I/V board which was made for E182CC. I separate some traces, add some wires - thats it.
My heating current is able to heat the 6n6p, since it was able to heat the 5687, which wants 900mA per tube!

Cheers Ernst
 
ernesternest

ernesternest

Member
Joined 2007
Paid Member
nightanole said:
Ya the 6n6p is a driver tube in name only. parrellel triode can put out allmost as much as a el84.

6N6P, 6N6PI (6H6n, 6H6nN)

so the "driver" can do 4 watts per side :eek:
Click to expand...

IknowIknowIknow. There are existing design for amps. There are also existing designs for using them in preamps or I/V stages running them less hot. I will run them less hot.

Ernst
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
ernesternest said:
IknowIknowIknow. There are existing design for amps. There are also existing designs for using them in preamps or I/V stages running them less hot. I will run them less hot.

Ernst
Click to expand...

You can se again it
 

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ernesternest

ernesternest

Member
Joined 2007
Paid Member
15mA vs 60mA

Quanghao,

thanks, I know the scheme.

After the old Ohm the E182CC takes 15mA (180V (delta B+ - Plate V) = 12000*0.015 This can be measured as well.
And so the 6n6p would take 60mA after this, since the Anode resistor results in 3K Ohm.
HV shunt gives 80mA, so this shouldnd work. So there micht be a failure in my thinking. Please enlighten me.

Cheers Ernst
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
ernesternest said:
Quanghao,

thanks, I know the scheme.

After the old Ohm the E182CC takes 15mA (180V (delta B+ - Plate V) = 12000*0.015 This can be measured as well.
And so the 6n6p would take 60mA after this, since the Anode resistor results in 3K Ohm.
HV shunt gives 80mA, so this shouldnd work. So there micht be a failure in my thinking. Please enlighten me.

Cheers Ernst
Click to expand...

Hi!
All tube 6h6 you fix 60mA???
if it ok, so SSHv total: 80m mA, it is work well!

1. E182CC it i good ad Anode: 90-125V , use parallel, Ad R k=330R
+B=260V, R a= 10K-11K, 13mA/one chanel, you can try do that!

2. Or use basic design by Andre and me in the DAC-end 2 use tube 5687 ~~E182CC. Fine Circuit in this link:
DAC End 2 - the AD1865N-K with single ended vacuum output stage
 
ernesternest

ernesternest

Member
Joined 2007
Paid Member
quanghao said:
Hi!
All tube 6h6 you fix 60mA???
if it ok, so SSHv total: 80m mA, it is work well!

1. E182CC it i good ad Anode: 90-125V , use parallel, Ad R k=330R
+B=260V, R a= 10K-11K, 13mA/one chanel, you can try do that!

2. Or use basic design by Andre and me in the DAC-end 2 use tube 5687 ~~E182CC. Fine Circuit in this link:
DAC End 2 - the AD1865N-K with single ended vacuum output stage
Click to expand...

Hi Quanqhao,

I strongly think there is a big misunderstanding :confused: So it seems I have to try to build my 6n6p stage right after your scheme with Anode resistors instead of CCS and see what will happen. Thanks for help anyway!

Btw, on Thursday we compared Anode resistors vs. CCS feeding the E182CC. The version with resistors had better trebles, the CCS had better bass. After that comparism I'd prefer resistors. But later that evening I found out there was a failure in the HV shunt of the CCS version. Due to thermal drift of the IRF840 the voltage rose too much, which further caused very low HV shunt current. The tubes were fed by 30mA and the shunt was running slightly below 40mA, although I used R1 = 22R. After Salas it should have at least 20mA headroom. Solution would have been to turn down the voltage or rise transformer voltage but we we were not able to solve the issue on that day. So I think we have to repeat the comparism.

Regards Ernst
 
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