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-   -   Velleman K4040 conversion from EL34's to KT88's (http://www.diyaudio.com/forums/tubes-valves/81587-velleman-k4040-conversion-el34s-kt88s.html)

GeorgeK 16th June 2006 10:45 AM

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

Tubes4e4 17th June 2006 07:50 AM

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

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.


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