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OLD THREAD DAC End by Andrea Ciuffoli

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apelizzo

apelizzo

Member
Joined 2006
quanghao said:
I Has use many This transformer, but i ont like it, it is very noise and not enough W. I am afraid it will be rung up, Not goot for Filament of parallel 5687

The transformer for DAC is very exelent! It is the best for DAC!
Click to expand...

R80-36 primary (0-115) x 2 /SCN: scondary (260-230-0-230-260)(200mA), 2.5-0-2.5(3A), 3.15-0-3.15) X 2(3A)
This is an 80W transformer not the little 40W, I can connect the 2.5+2.5+3.15 = 8.15V series for 3Amps AC. Two E182CC heater is 1.28A DC. Do you think isn't enough?
I'm currently using an identical one in my line stage amp. 2x6SL7 2x6SN7 1x5Y3GT Heater in AC though (I love AC on heater).
If buzzing I will take them to vanish again. The leakage is similar to toroidal transformer, much less then EI.
 
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quanghao

quanghao

Member
Joined 2009
quanghao.com/
apelizzo said:
R80-36 primary (0-115) x 2 /SCN: scondary (260-230-0-230-260)(200mA), 2.5-0-2.5(3A), 3.15-0-3.15) X 2(3A)
This is a 80W transformer not the little 40W, I can connect the 2.5+2.5+3.15 = 8.15V series for 3Amps AC. Two E182CC heater is 1.28A DC. Do you think isn't enough?
i think you can try it. im not sure it is good
So! parallel filament 5687 at 6.3 = 900mA. 2 tube= 1.8A
Click to expand...
 
S

sugden

Member
Joined 2007
quanghao said:
It is very nice!
but the tranformer near The Iv stage.
you can rotate 90 degrees transformers, power transformers and barriers between the motherboard and features a shield!

And you do not use L1, L2 so you do not use R30, R31, R32 , R34 .

R8, R9 (2.2 Ohm) in the HV supply is very hot, you can change by R 1 Ohm parallel

The Cap in put is good, i like it!
Click to expand...

Do you mean if we do not want to use L1 and L2, we no need to use R30, R31, R32 and R34 resistors also?
 
apelizzo

apelizzo

Member
Joined 2006
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Hi everyone,

DO NOT TRUST THE PCB SILK SCREEN

CHECK POLARITY OF ELECTROLYTIC CAPACITORS. HEATER CAPS INVERTED

FOLLOW THE TRACKS AND CHECK EVERYTHING.


**********************************************************
**********************************************************
 
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S

sugden

Member
Joined 2007
apelizzo said:
**********************************************************
**********************************************************
Hi everyone,

DO NOT TRUST THE PCB SILK SCREEN

CHECK POLARITY OF ELECTROLYTIC CAPACITORS. HEATER CAPS INVERTED

FOLLOW THE TRACKS AND CHECK EVERYTHING.


**********************************************************
**********************************************************
Click to expand...


Please high light the any silk screen error here, it will help to prevent unnecessary caps explosion during start-up. Thanks.
 
A

adamus

Member
Joined 2008
apelizzo said:
**********************************************************
**********************************************************
Hi everyone,

DO NOT TRUST THE PCB SILK SCREEN

CHECK POLARITY OF ELECTROLYTIC CAPACITORS. HEATER CAPS INVERTED

FOLLOW THE TRACKS AND CHECK EVERYTHING.


**********************************************************
**********************************************************
Click to expand...


good catch. that would have made a nice mess. did you catch it before power on?

quanghao, in the pic shown how come r3 (in the IV Power supply) isnt populated?
 
apelizzo

apelizzo

Member
Joined 2006
adamus said:
good catch. that would have made a nice mess. did you catch it before power on?

quanghao, in the pic shown how come r3 (in the IV Power supply) isnt populated?
Click to expand...

Unfortunately not, but during maiden I only power up for few seconds (with a light bulb in series on AC mains), then I check if anything gets hot. I found the cap already warm. It's still working but I will replace it.

I just received R3 yesterday. It was a back order. Now it's in place.
 
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