Velleman K4040 conversion from EL34's to KT88's

GeorgeK · 16th June 2006, 10:45 AM

Has anyone converted a Velleman K4040 from the STD EL34 output tubes to KT88's?

Tubes4e4 · 17th June 2006, 07:50 AM

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

assimaki · 28th June 2008, 11:29 AM

Hallo!
The link is not working and no google cached is available.
Do you know where can I find info about the KT88 conversion?

Svein_B · 28th June 2008, 01:20 PM

Try www.archive.org

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

SveinB.

assimaki · 28th June 2008, 03:50 PM

Thanks!

dagney2000 · 2nd July 2008, 09:41 AM

How is the project going?
Any review on your improved Tube amp?
I have 2 Velleman kits, and want to this project aswell.

assimaki · 8th February 2009, 07:12 PM

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.

16th June 2006, 10:45 AM	#1
GeorgeK diyAudio Member Join Date: Jun 2006	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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28th June 2008, 11:29 AM	#3
assimaki diyAudio Member Join Date: Jan 2008 Location: Athens, Greece	Hallo! The link is not working and no google cached is available. Do you know where can I find info about the KT88 conversion?

28th June 2008, 01:20 PM	#4
Svein_B diyAudio Member Join Date: Oct 2005	Try www.archive.org Here is the 4040 article: http://web.archive.org/web/200512101...com/k4040.html SveinB.

28th June 2008, 03:50 PM	#5
assimaki diyAudio Member Join Date: Jan 2008 Location: Athens, Greece	Thanks!

2nd July 2008, 09:41 AM	#6
dagney2000 diyAudio Member Join Date: Aug 2006	How is the project going? Any review on your improved Tube amp? I have 2 Velleman kits, and want to this project aswell.

8th February 2009, 07:12 PM	#7
assimaki diyAudio Member Join Date: Jan 2008 Location: Athens, Greece	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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