A short quick upgrade for my Ceasar II Mono´s
to push the sq to the limit...


In the meantime...

As you could see in the Upgrade Part #1, the printing of the Sophia Electric Royal Princess 300B
is 90 degrees different to the Emission Labs 300B-XLS.

Not a big thing, but it´s not looking good!


Unfortunately i have only two holes for the Tube-Socket. Therefore i made two small adapter to rotate the Tube-Socket.





Now the printing faces to the front!



Perfect!



2nd Upgrade


The three grid stopper resistors will be changed from AUDIO NOTE™ 2 Watt Tantalum to Texas Components TX2575

A short quick upgrade for my Ceasar II Mono´s
to push the sq to the limit...

The last upgrade i made is to swap from the very good sounding Emission Labs 300B-XLS to



the Sophia Electric Royal Princess 300B



For me the best sounding 300B on the market!

The parts for further upgrading are:



1st - The caps C2 & C3
2nd - The grid stoppers R5, R8 & R10


1st Upgrade






The Mundorf silver/gold/oil are changed to the new Duelund Cast PIO-Cu.

Because i am on vacation, i had the time to listen to two other tube rectifier i have.

The question, if there are still differences in sound with different tube rectifiers and the SSHV in between, is

YES !!!

Till now i used the Bendix 6101, a very nice sweet and soft sounding rectifier.

After i roll to the SED Winged "C" 5U3C (5U4-G) Black Plate rectifier,



...someone lift a invisible curtain...



Much more precision in the mids and highs and the soundstage open up in all directions.
Jesus, in comparison the Bendix sounds much to soft!

The Mullard GZ37/CV378 Coke Bottle has also the qualities of the 5UC3 Black Plate,
but is a bit softer sounding.

The only disadvantage

Attached Files

5 Reasons to Specify Bulk Metal Foil Pots.pdf (800.9 KB, 732 views)

Transformer input voltage: 3* 24VAC
Shunt input voltages: 3* 32VDC
Shunt pot value: 3* 5k0
Heatsink Rth: 3,7 K/W or better

On request the section of my digital input modules