Since this unit has been used for quite some time, the owner agreed to recap all the electrolytic capacitors. We checked all the capacitors and found that some had already leaked and some are busted, including some resistors that showed sign of overheating.
Some mounting that we do not like was also modified - electrolytic capacitors being placed directly beside a vacuum tube. Such capacitors will be operating at high temperature and will have shortened lifespan.
The stock ceramic tube sockets were of low quality types and were replaced with Teflon or high grade ceramic with gold plated copper pins. The new sockets provides a much better contact, mechanically stable, and less resonant compared to the stock sockets. There are several other changes and modifications that we do not mention here but is beneficial to the sound or build of the Audio Note Conquest amplifier.
The owner wanted to upgrade the EI output transformer to J&K Level 3 Nanocrystalline Output Transformer too but unfortunately the cavity was too small to fit the Level 3 OPT. The owner will be saving that for a future new tube amplifier.
|Audio Note Conquest|
|Teflon tube sockets with gold plated copper pins|
|Tube rectification board before modification|
|Top view after completing the modifications - note all the new high quality tube sockets.|
|All the Rubycon capacitors are changed to Nichicon|
|The low quality rectifier tube socket|
|Modifications made to provide 5X4G compatibility. Capacitors are upgraded too.|
|Comparison of high quality versus low quality tube sockets.|
|Worn capacitors and tube sockets|
|Some doctor scribblings on what to change.|
|Side view of the high quality Teflon 300B tube sockets|
|Teflon 300B tube sockets|
|Nichicon Capacitors for B+|
The Audio Note Conquest will go through several checks before being powered on. After that, it will go through some burn-in test before being passed back to the original owner.
Due to the busy schedule we have, we shall be limiting our modification and repair services to focus on our core business. Apologies for not taking in all work from now onwards. This may be our last repair and modifications service job unless there are some that are really worth our attention for analysis or study purposes.
J&K Audio Design