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2A3 cathode resistor
2A3 cathode resistor
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Old 29th December 2017, 06:40 AM   #1
lexx21 is offline lexx21  United States
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2A3 cathode resistor
Default 2A3 cathode resistor

I have build the Shishido 2a3 amp and now I am in the process of tweaking it. Currently I have 3k "coffin box" resistors, those white cermet resistors in the cathode.

Were you to optimize parts, what brand/type of resistor would you use in place of a cermet.

The amp sounds pretty good now, however I still have it on a piece of plywood until I get it just the way I want it. Looking for input.

Oh, I am using low esr caps for the bypass caps. Unless there is something better than those in that position, I had intended on leaving them. Any input on those as well?

Thanks in advance.
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Old 29th December 2017, 07:02 AM   #2
50AE is offline 50AE  Bulgaria
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2A3 cathode resistor
Try Ohmite AG series, they're also quite cheap
Also MILLS, slightly more expensive than the Ohmites.

Both are wirewounds.
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Old 29th December 2017, 07:29 AM   #3
pelayostyle is offline pelayostyle  United States
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2A3 cathode resistor
Vishay NH (non inductive) for resistors. Nichicon KZ or Elna Silmic II for caps.
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Old 29th December 2017, 07:50 AM   #4
repycte is offline repycte  Europe
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I am using Arcol/Ohmite AP101 Series resistors with good results: thickfilm resistors (non-inductive) in an isolated TO-247 package. You just have to mount them somewhere on your enclosure.
You may select another manufacturer (e.g. Vishay) or series with lower power handling or rated voltage as you like.
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Old 29th December 2017, 08:22 AM   #5
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Good advice 50AE.

Btw, have you ever tried russian square/green non-inductive power resistors?
I did not see any info about it.
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Old 29th December 2017, 09:43 AM   #6
lexx21 is offline lexx21  United States
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2A3 cathode resistor
Thanks for the input guys
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Old 29th December 2017, 10:27 AM   #7
eduard is offline eduard  Netherlands
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Hello,
Hiraga always wrote to use non inductive wirewounds high power resistors. The resistor in aluminium housing are good quality but people say the Mills are better. But Mills are just 12 watt so maybe put 3 in parallel. They will get hot but they have no problem getting hotel. Just take care they don't heat up the capacitor! The mills don't need wires like the aluminium resistor do. So try to use the wires that are attached to the Mills. I think that can be done. Have some distance between the resistors to get some airflow. Greetings, Eduard
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Old 29th December 2017, 01:37 PM   #8
50AE is offline 50AE  Bulgaria
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2A3 cathode resistor
Quote:
Originally Posted by RajkoM View Post
Good advice 50AE.

Btw, have you ever tried russian square/green non-inductive power resistors?
I did not see any info about it.
I'm sorry, I've never heard anything about square green military resistors.
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Old 29th December 2017, 03:11 PM   #9
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Ok, thanks
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Old 30th December 2017, 06:20 AM   #10
Trajan is offline Trajan  United States
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Ohmite has never let me down.
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