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01A question
01A question
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Old 10th November 2015, 01:37 PM   #1
sumotan is offline sumotan  Indonesia
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Default 01A question

Hi Guys
Advice pls. Been researching the above tube. Notice that aside from 01A numbering,
I see SX 201A, UX 201A, CX 301A etc. Are they all the same tube type.


Many Thanks
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Old 10th November 2015, 01:44 PM   #2
kaputt is offline kaputt  Germany
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All the same type, just what different brands called them.
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Old 10th November 2015, 01:50 PM   #3
ballpencil is offline ballpencil  Indonesia
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This should cover most, if not all, of what you need to know about 01a.

VinylSavor: Tube of the Month : The UX201A
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Old 10th November 2015, 02:27 PM   #4
sumotan is offline sumotan  Indonesia
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Thks guys
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Old 10th November 2015, 02:35 PM   #5
sumotan is offline sumotan  Indonesia
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Hi Guys
Sorry what good rectifiers should be use to complement the 01A

Thks again
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Old 10th November 2015, 02:55 PM   #6
kaputt is offline kaputt  Germany
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The voltage and current requirements of the 01A are very benign. You can use whatever makes you happy.
If looks are important just look around what type of globe rectifiers you can find cheaply (maybe type 80??) and go with that.
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Old 10th November 2015, 03:02 PM   #7
ballpencil is offline ballpencil  Indonesia
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ultrafast diodes
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Old 10th November 2015, 04:29 PM   #8
andyjevans is offline andyjevans  United Kingdom
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If you're thinking of building Ale Moglia's 01A Gen 2 preamp, then that's the best preamp I've ever heard. If you aren't you should be!

01a Preamp (Gen2) | Bartola Valves
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Old 10th November 2015, 08:22 PM   #9
Hylle is offline Hylle  Denmark
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Andy, what is it you feel Gen 2 preamp does better than all else?
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Old 10th November 2015, 09:20 PM   #10
andyjevans is offline andyjevans  United Kingdom
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It's transparent, airy, almost as if it isn't there at all. I found it quite magical. Better than a 26 preamp with LL1692 in 2:1. Better than a 4P1L preamp. That's a lot of "better".

But be clear that this is a complex design which needs to be built EXACTLY according to the schematic - absolutely no short cuts. Every component is there for a reason.

Last edited by andyjevans; 10th November 2015 at 09:23 PM.
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