GeorgeK said: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
Try www.archive.org
Here is the 4040 article: http://web.archive.org/web/20051210143749/http://ironradio.com/k4040.html
SveinB.
Here is the 4040 article: http://web.archive.org/web/20051210143749/http://ironradio.com/k4040.html
SveinB.
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.
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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