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Old 20th May 2013, 02:34 PM   #461
shaan is offline shaan  India
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Quote:
Originally Posted by JOHN BALI View Post
Second channel has passed the test too, 6mV DC offset a little bit lower bias and I feel this one has nicer sound


Same types and values of components and same circuit and same layout but different sound?!



Please upload pics of both boards... lots of pics.
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Old 20th May 2013, 03:26 PM   #462
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Default Lots of pics

Quote:
Originally Posted by shaan View Post

Same types and values of components and same circuit and same layout but different sound?!

Please upload pics of both boards... lots of pics.
Maybe just my feeling
They are tested & I will drill the heat sink, prepare PSU, etc,... anything that need to do

Now it time to share what I made

Thank you Shaan, Lazy Cat, PMI, Naf & everyone that support me
see you soon

I want to give it a name: VSV PeeCeeBee
PeeCeeBee size 50 mm * 84 mm a bit smaller than your ID card
Attached Images
File Type: gif DipTrace PCB - VSSA.gif (81.3 KB, 860 views)
File Type: jpg PeeCeeBee.jpg (178.8 KB, 835 views)
File Type: jpg Potong balok D.JPG (85.6 KB, 781 views)
File Type: jpg Same.jpg (222.0 KB, 767 views)
File Type: jpg Landscape.jpg (142.7 KB, 694 views)
File Type: jpg bottom side.jpg (169.2 KB, 391 views)
File Type: jpg Input pair close up.jpg (113.4 KB, 344 views)
Attached Files
File Type: pdf bottom JB VSSA.pdf (36.7 KB, 185 views)
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peace & G B U

Last edited by JOHN BALI; 20th May 2013 at 03:38 PM. Reason: VSV = Very Symmetric View
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Old 20th May 2013, 04:19 PM   #463
PMI is offline PMI  United States
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@John: Everything looks really good!

Just one Q: I see the drivers on the bottom of the board, but what keeps them in contact with the heatsink, in other words, how are they attached or pressed to the heatsink?

P.S.: I can't believe you managed to cut that heatsink by hand... OMG!

Last edited by PMI; 20th May 2013 at 04:21 PM.
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Old 20th May 2013, 04:43 PM   #464
PMI is offline PMI  United States
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Quote:
Originally Posted by shaan View Post
Same types and values of components and same circuit and same layout but different sound?!
Shaan, when I first got second channel working, I could swear they sounded different too. I even swapped channels to make sure.

Not sure why, but after a day or so, and after I re-calibrated the bias and offset, they seemed to sound the same. It could be electrolytic caps taking a bit of time to settle, or maybe something was off because I did not set them up at the same time. Or, it could just be listening to one channel for a week...

I believe that LC posted somewhere that new caps needed 50 hrs to "bed in", and he is using super-premium elcos. I am using the Panasonic FR-series in the first two boards (low ESR @ low cost).
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Old 20th May 2013, 04:46 PM   #465
shaan is offline shaan  India
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That's right, that HS with that saw?! OMG!



Thankz 4 da pikz John!
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Old 21st May 2013, 01:16 AM   #466
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Quote:
Originally Posted by JOHN BALI View Post
Maybe just my feeling
They are tested & I will drill the heat sink, prepare PSU, etc,... anything that need to do

Now it time to share what I made

Thank you Shaan, Lazy Cat, PMI, Naf & everyone that support me
see you soon

I want to give it a name: VSV PeeCeeBee
PeeCeeBee size 50 mm * 84 mm a bit smaller than your ID card
Ooh, nice. Very 'organic' looking like PCBs used to be done in the '70s. May I ask what VSV stands for?
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Old 21st May 2013, 08:33 AM   #467
shaan is offline shaan  India
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Ya it's got lots of curves...
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Old 21st May 2013, 09:41 AM   #468
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Default More pictz :)

Quote:
Originally Posted by PMI View Post
@John: Everything looks really good!

Just one Q: I see the drivers on the bottom of the board, but what keeps them in contact with the heatsink, in other words, how are they attached or pressed to the heatsink?

P.S.: I can't believe you managed to cut that heatsink by hand... OMG!
Nothing impossible or maybe I have too strong muscle

BTW Here how the vas tranie sit on the heat sink

Quote:
Originally Posted by jkuetemann View Post
Ooh, nice. Very 'organic' looking like PCBs used to be done in the '70s. May I ask what VSV stands for?
Hi Jason, Very Symmetrical View
but from the top only, bottom view not so good at all...
I like to do PCB like that feel like old school day

Shaan, I post two more pictz hope that's okay
one channel done, the other next day maybe ...
Attached Images
File Type: jpg Vas heatsink.jpg (69.6 KB, 252 views)
File Type: jpg Finish 1 ch.jpg (89.7 KB, 273 views)
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Last edited by JOHN BALI; 21st May 2013 at 09:44 AM. Reason: one more ch to go
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Old 21st May 2013, 10:23 AM   #469
naf is offline naf  Indonesia
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Hi bli John, you have really really nice build... handmade peeceebee. Yeachh... you have an arts skill and strong muscle too
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Old 21st May 2013, 11:35 AM   #470
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Quote:
Originally Posted by shaan View Post

Same types and values of components and same circuit and same layout but different sound?!
This is probably due to new elco-s. There is a way to form elco-s before soldering them. Some people use small 7815 regulators to charge elco at 15V for about 15 minutes. Then elco is discharged through high power resisitor. After that elco is again charged for 15 minutes at voltage close to nominal voltage and again discharged through high power resistor. It is even better to use lab supply for forming of elcos because some elcos are rated only 6V or 10V.
It is claimed that this forming also make elcos last longer.
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