# Output tube stage 1578 for no DAC

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• USB-I2S DSD lampizator 6SN7 output.jpg
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#### merlin el mago

Paid Member
Please Mods change the thread name: OUTPUT TUBE "STAGE" 1578 FOR NO DAC.

TIA
Felipe

#### merlin el mago

Paid Member
Someone knows the output impedance?

Felipe,

Did you build the output tube stage with NO DAC?

#### merlin el mago

Paid Member
Still not, I have problems to install WaveIO drivers and I'm waiting the repaired Amanero that surely arrives next week.

#### DF96

merlin el mago said:
Someone knows the output impedance?
[ra + (mu+1)Rk] || RA

#### disco

6-7K or something close.

#### merlin el mago

Paid Member
Thanks guys.

[10.000R + (20+1) x 820R ] // 10.000R = 72.312R

#### disco

eu-urh... first you solve thingy inbetween brackets (17K22), then add 10K => 27K22 and then parallel to 10K. So, 7K3

#### merlin el mago

Paid Member
[10.000R + (20+1) x 820R ] // 10.000R = 72.312R

21 x 820R = 17.220R

(10.000R + 17.220R) // 10.000R = 72.312R

#### DF96

merlin el mago said:
[10.000R + (20+1) x 820R ] // 10.000R = 72.312R
DF96 said:
[ra + (mu+1)Rk] || RA
Can you see the difference?

|| not //

|| means parallel, so x||y = xy/(x+y)

Last edited:

#### merlin el mago

Paid Member
Can you see the difference?

|| not //

|| means parallel, so x||y = xy/(x+y)

Yes thanks for help.

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