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HQ-IV tube output balance DAC

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#241
passive420 said:
I'm getting 245V DC at C3 filter caps. Output is 153V DC!

Somewhere the circuit is dropping 90V but the heatsink isn't even warm and VR1 simply does nothing. I'll probe around the reg and get some readings

I'm hoping you can get yours to work. That's something to go on.
Click to expand...

What is the rating of your transformer?

I will try to start building early. I work in the morning, I can only do this in the evening.
 
#242
passive420 said:
I'm getting 245V DC at C3 filter caps. Output is 153V DC!

Somewhere the circuit is dropping 90V but the heatsink isn't even warm and VR1 simply does nothing. I'll probe around the reg and get some readings

I'm hoping you can get yours to work. That's something to go on.
Click to expand...

Passive420, I started my ps, installed the diodes, hv and lv, and its filter caps, connect the trafo, and I got 320v on the hv, and about 18v on the lv, no load though, but so far so good. I was able to finish the lv and everything works, was able to zero in at 12vdc (again no load), with the pot. Tomorrow, I will finish the hv. Hope you got yours to work.
 
#243
Tube Output stage build

For anybody interested, I just finished my build and used quanghao's DAC-END R Dac. I used 12AU7 and 6DJ8 tube. This set-up sounds excellent, sound is very open, relaxed and detailed, fast but not hard or mechanical sounding, extremely musical.
 

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#244
Dear quanghao,
Some of the members if not all of them have received the PCB and as I have seen some are finished, still I haven't received mine, and on the post office site there is no sign of them. Can you please verify what could have happed - it has been more then 2 months since you have sent it.
Thank you.
 
#245
adeveza said:
For anybody interested, I just finished my build and used quanghao's DAC-END R Dac. I used 12AU7 and 6DJ8 tube. This set-up sounds excellent, sound is very open, relaxed and detailed, fast but not hard or mechanical sounding, extremely musical.
Click to expand...

hi!

you can use R iv for this IV, sound the better

1. Output 2V rms : R/IV = 18 R- Ohm
2. Output 3V rms: r/IV = 27R

thanks
 
#246
mvictor69 said:
Dear quanghao,
Some of the members if not all of them have received the PCB and as I have seen some are finished, still I haven't received mine, and on the post office site there is no sign of them. Can you please verify what could have happed - it has been more then 2 months since you have sent it.
Thank you.
Click to expand...

please try one week, if you can not get.

so i will sent you other PCB.

thanks

but you need sent all full your information to me: address +your phone

quanghao
 
#249
Is it possible to get a set of these PCB's or is the GB over? If it is not to late where do I sign up or put an order in? Thanks!

best regards,
Steve
ps
[is this the item that is on your web store and I just order there?]
thanks again
 
Last edited:
#256
Ryssen said:
Question nr 2:Can i use 6N23 and Ecc99?
What voltage to use?
Click to expand...

I'm planning to use 12AU7 and ECC99. Haven't decided on the voltage yet!

I'm also seeking advice on what transformer I can use. I ahve tried to source a customer made unit in Australia with a 184V secondary, but they're either really expensive (~$200) or the supplier isn't interested (e.g. Harbuch.)

Is there a generic unit I can use? If I have a 240V secondary, what's the range of usable B+ voltages I can use, e.g. can I go down to 220V B+?
 
#257
jonwhitear said:
I'm planning to use 12AU7 and ECC99. Haven't decided on the voltage yet!

I'm also seeking advice on what transformer I can use. I ahve tried to source a customer made unit in Australia with a 184V secondary, but they're either really expensive (~$200) or the supplier isn't interested (e.g. Harbuch.)

Is there a generic unit I can use? If I have a 240V secondary, what's the range of usable B+ voltages I can use, e.g. can I go down to 220V B+?
Click to expand...

Yes . You can run at +b =220v. That is good .
No need use 260v .
+b can use from 220 v to 260v . Thanks
 
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