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K8011/K8010 PCB build thread
K8011/K8010 PCB build thread
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Old 4th October 2014, 05:10 PM   #21
jamesfeline is offline jamesfeline  United Kingdom
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Hi

Nick again the board is now complete ready for the 1st fire up. Just need to make a bracket for the speaker terminals etc.

This a 1st attempt at a gerber file conversion from artwork, the PCB is 2 oz copper tracks ... nearly complete, then onto a full stereo version (monoblocks) then a kt88 class a version.

this has been a long project .... anyone else interested?

enjoy the pics
Attached Images
File Type: jpg PA040001.jpg (656.7 KB, 373 views)
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File Type: jpg PA040009.jpg (576.8 KB, 111 views)
File Type: jpg PA040010.jpg (478.2 KB, 112 views)
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Old 4th October 2014, 05:13 PM   #22
jamesfeline is offline jamesfeline  United Kingdom
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one more missed photo
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Old 6th October 2014, 11:39 AM   #23
SWIN is offline SWIN  Sweden
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Very nice work, indeed!

The original output transformers can be found at Plitron homepage:Toroidal Audio Transformers

Some interesting reading on the K4040: Under the skirts on a Velleman 4040 - AudioKarma.org Home Audio Stereo Discussion Forums
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Old 6th October 2014, 05:58 PM   #24
jamesfeline is offline jamesfeline  United Kingdom
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Hi

Thanks for showing a interest in my work .. I thought for a while no one was interested.
I never knew that they where the original makers of the transformers .. and still available, what product code do you think are from their web site?

many thanks

Nick
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Old 6th October 2014, 06:52 PM   #25
SWIN is offline SWIN  Sweden
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Hi!

Yes, quite a feat you pulled there - making a copy of the Velleman PCB, very impressive.

Plitron, I think, have a similar board:

PCB for Tube Amplifiers

And using the transformers PAT4004 or PAT4006.

Some of the information, on what transformer that was in the original Velleman kit, I do have somwhere in this computer, now then, just how to find it

Some information on the Plitron board: http://www.pearl-hifi.com/06_Lit_Arc...L34_PP_Amp.pdf

Last edited by SWIN; 6th October 2014 at 07:04 PM.
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Old 10th October 2014, 11:43 AM   #26
jamesfeline is offline jamesfeline  United Kingdom
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Hi

Could when you get time let me have the details of the output transformers as sowter transformers are very expensive.

regards

Nick
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Old 10th October 2014, 01:57 PM   #27
samb is offline samb  France
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nick,
as i told you i have modified my 8011,
I have replaced the chinise original output transformer by the LUNDHAL
1623 P-P well known. Result is good and it is a plug in replacement.
Cost was around 400 euros for a pair but today i do not know if it is the same
you could see the cost on DIYparadiso a belgian DIY site.
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Old 10th October 2014, 06:39 PM   #28
jamesfeline is offline jamesfeline  United Kingdom
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Hi
Yes I remember now and I have seen that site, the LUNDHAL transformers are still available as I have just checked .. have you a connection diagram on how you connected to the PCB? all the best Nick ... how are your repairs going? do you have all the bits that you need now ? nick
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Old 13th October 2014, 07:49 AM   #29
samb is offline samb  France
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the lundals LL1623 need some customisation to your exact need.
Your have to select on the lundhal site the amplifier configuration triode or ultralinear or pentode... this gives you the wiring to do on the transformer
For myself it is the C' wiring.
As it is a triode configuration you will have 3 wires in and 2 wires out.
It is not difficult but needs some attention.
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Old 26th October 2014, 07:49 AM   #30
samb is offline samb  France
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hi nick
did you have some progres in your new PCB project? did you get some sound from it?
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