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Old 16th June 2006, 11:45 AM   #1
GeorgeK is offline GeorgeK  Australia
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Question Velleman K4040 conversion from EL34's to KT88's

Has anyone converted a Velleman K4040 from the STD EL34 output tubes to KT88's?
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Old 17th June 2006, 08:50 AM   #2
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Default Re: Velleman K4040 conversion from EL34's to KT88's

Quote:
Originally posted by GeorgeK
Has anyone converted a Velleman K4040 from the STD EL34 output tubes to KT88's?
Yes, try this link., scroll down a bit.

If the link doesn´t work, use the cached google version instead.

Tom
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Old 28th June 2008, 12:29 PM   #3
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Hallo!
The link is not working and no google cached is available.
Do you know where can I find info about the KT88 conversion?
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Old 28th June 2008, 02:20 PM   #4
Svein_B is offline Svein_B  Norway
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Try www.archive.org

Here is the 4040 article: http://web.archive.org/web/200512101...com/k4040.html

SveinB.
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Old 28th June 2008, 04:50 PM   #5
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Thanks!
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Old 2nd July 2008, 10:41 AM   #6
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How is the project going?
Any review on your improved Tube amp?
I have 2 Velleman kits, and want to this project aswell.
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Old 8th February 2009, 08:12 PM   #7
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Hi,
It was a long project as after the proposed mods and the use of 6550 the results were not OK.
It seems that the concertina design can not drive the 6550/KT88.
I returned back to original design.
The sound of K4000 was always average, it was improved only when i used a TFK ECC82.
In a Greek forum (avsite) they suggest to change from 1 ECC82 and 2 ECC83 to 1 ECC83 and 2 ECC82.
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