• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Velleman K4040 conversion from EL34's to KT88's

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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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