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K8011/K8010 PCB build thread
K8011/K8010 PCB build thread
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Old 20th April 2014, 02:21 PM   #1
jamesfeline is offline jamesfeline  United Kingdom
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Default K8011/K8010 PCB build thread

Hi

I have always been a fan of these mono block amplifiers via velleman .. both the el34 and kt88 version.
Velleman have long since stopped production of these years ago .. I purchased their last 27 boards they had in stock. I have now since decided to make my own new production boards (Velleman where ok) but the issue was that these boards where made before Gerber files.

So after some hard work I produced the artwork the old fashion way then painstakingly converted to a full Gerber file so I can get them made again.

My new boards are fully drilled with 2oz copper tracks. This is the 1st production board being populated, with the wire links 1st .. I will update more on the progress of the first board. This will be A 90w EL34 version. The new PCB boards are thicker as well so no flex ..
Attached Images
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File Type: jpg P4200024.JPG (264.6 KB, 1011 views)

Last edited by jamesfeline; 20th April 2014 at 02:26 PM. Reason: added more text
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Old 20th April 2014, 02:58 PM   #2
jamesfeline is offline jamesfeline  United Kingdom
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Hi

Jamesfeline again ... just to add that I will be using Sowter transformers for this build

regards

Nick
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Old 22nd April 2014, 08:26 PM   #3
jamesfeline is offline jamesfeline  United Kingdom
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Default K8011/K8010 PCB build thread

Hi

Some more pics

These show the chassis in preparation and the power / output transformers being bolted to the chassis

Then the PCB being offered up for alignment purposes ... This will be the first prototype replica of the K8011/k8010 mono block valve amplifier based on EL34 valves
Attached Images
File Type: jpg P4220001.JPG (278.0 KB, 320 views)
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File Type: jpg P4220007.JPG (269.0 KB, 229 views)

Last edited by jamesfeline; 22nd April 2014 at 08:28 PM.
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Old 17th June 2014, 07:33 PM   #4
chris59190 is offline chris59190
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hi,
Can you give me the gerber file ?
Thanks

Regards

Chris
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Old 11th August 2014, 08:48 PM   #5
jamesfeline is offline jamesfeline  United Kingdom
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Hi

Some more progress on the k8011 PCB (90w RMS Mono block)
This is a new PCB with my own Gerber files with 2 oz copper tracks ..
Attached Images
File Type: jpg k8011 pics 001.jpg (83.7 KB, 300 views)
File Type: jpg k8011 pics 002.jpg (85.4 KB, 323 views)
File Type: jpg k8011 pics 003.jpg (84.5 KB, 308 views)
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Old 13th August 2014, 04:08 PM   #6
Matt BH is offline Matt BH  United Kingdom
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Are the output transformers Velleman or have you had some made?

Cheers
Matt.
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Old 13th August 2014, 05:15 PM   #7
jamesfeline is offline jamesfeline  United Kingdom
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Hi

These ones in the photos are the original velleman ones, which are very good quality. Once these run out I have transformers supplied by Sowter

I can sell boards if people wish

regards

Nick
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Old 13th August 2014, 07:29 PM   #8
jamesfeline is offline jamesfeline  United Kingdom
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Hi

I hope to have this 1st board running this weekend, then have a stereo pair fully cased and running using EL34

My next build would be a pair of KT88 (K8010) 60W CLASS A mono blocks

regards

Nick
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Old 18th August 2014, 08:37 AM   #9
samb is offline samb  France
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hello nick,
i have built the K 8011 with EL34 and still have them. but one of the monos has a failure and i have not been able and lucky in findind the component out of sevice.
I am interested in a board to allow me to rebuild it from scratch (today one mono is ok and the second is out of service)
What would be the cost of a board (your new one or the genuine velleman if you have one)
For your info my K 8011 have been deeply improved with the help of a belgian professional mister benny of DIYPARADISO.
The biasing of the two ECC82 and ECC83 have been modified,the interstage capacitors are JENSEN cooper in oil, a choke has been added in the HV power suply and the output transformer is a LUNDHAL one
Last are the the components for the EL34 biasing (it is an integrated circuit)and the protection part easy to found?
regards
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Old 18th August 2014, 09:25 AM   #10
jamesfeline is offline jamesfeline  United Kingdom
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Hello

I will PM you .. I have all the parts for the K8011 and k8010 in stock. I have a spare k8011 original velleman board if you wish.

the Bias IC I have in stock as well just let me know what parts you need. My email is nick.sandra@btinternet.com

regards


Nick

Last edited by jamesfeline; 18th August 2014 at 09:51 AM.
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