Tubelab 45 SE

[martin155]

I would need to know which resistors (R14, R25) should I use for Tubelab 45... 30K 3W ?


And should I choose the resistors for higher wattage (for longer parts life) or there is some resistor power reserve already taken into an account?

 

[6A3sUMMER]

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[Tubelab_com]

30K at 3 watts is fine.

You will find more information on the TSE and other Tubelab boards here:

https://www.diyaudio.com/forums/tubelab/

 

[JoeAlders]

If I look at:


http://www.tubelab.com/images/AssemblyManualTubelabSE/TSE_board.jpg


then there is for both resistors 20k 3 Watt


But I perhaps am looking at the wrong site.

 

[martin155]

Thank you very much!


Yeah there is 20K but in the part list section there is note the R14 and R25 should be 30 or 36K according to board voltage

 

[Tubelab_com]

My 45 based TSE has 27 K resistors in it but I ran it on about 330 volts. As you raise the B+ voltage you must reduce the current through the mosfets to keep them from getting too hot, unless you use bigger heat sinks.

 

[martin155]

I have been recommended Monolith Magnetics output transformer for the 45 tube amp and I was wondering if there is somebody who has experience with more than one transformer and could compare the Monolith Magnetics to other brands like Hashimoto, Lundahl, Tamura, Tango, Tribute or any other.


Also I am thinking about what resistors and capacitors to choose. I am considering to use metal film Vishay resistors (because of the low level of distortion), what do you think about them?


And probably one of these capacitors:
Mundorf Supreme SilverGold Oil
V-cap CuTF
Jupiter Copper Foil Paper & Wax,
Intertechnik Audyn True Copper MAX
Miflex KCPU-01
Rike Audio Q-CAP

I have found most information about the Mundorfs, do you have some experience with the other one. Which caps would you recommend?
I heard good things about Duelund CAST Cu-Sn, what do you think about them comparing them to other mentioned caps? Is there maybe some cheaper and similar version of them offered by another brand?


Thank you very much for help

 

[martin155]

My 45 based TSE has 27 K resistors in it but I ran it on about 330 volts. As you raise the B+ voltage you must reduce the current through the mosfets to keep them from getting too hot, unless you use bigger heat sinks.

What is the ideal voltage or how high voltage is there when building the Tubelab SE according to assembly manual?
If I have voltage around 280V 20K R14 and R25 resistors will be enough?