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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 7th January 2018, 05:01 PM   #1
michaeljessen is offline michaeljessen  Denmark
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Default specification for the catode bypass cap in Tubelab SE

Is it ok to use 4700mf - 16V for the C-8 & C-10 in the tubelab SE ? The specifikation in the part list is 4700mf - 6,3V. Can I use a 4700mf - 16V insted of 6,3V ? I ask because I can get a Audio Note Kaisei electrolytic 4700mf. 16V

Another question is about the C5. Can I use a 220mf 350V for a 45 application?
I have a pair of Nation Union NOS 45 from year 1951 and want to go about 250-275V in the B+ Is it ok with a 350V or is a 500v better? I think i run a Hammond M158 choke and 5mf 350V at C-4. My power transformer is a Hammond 370 EX 550vct 144mA

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Old 7th January 2018, 06:39 PM   #2
Tubelab_com is offline Tubelab_com  United States
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The 350 volt caps should be OK with that transformer.

Quote:
Can I use a 220mf 350V for a 45 application?
Yes.

Quote:
5mf 350V at C-4.
5uF may not give you enough B+. Build it and see. If you want a little more voltage use a larger microfarad value for C4. Don't go higher than 47 uF.
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Old 7th January 2018, 08:17 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Sorry but mF is milli farad not micro farad. Somewhat larger in value.
Just sayin'
The SI derived unit for capacitance is the farad. 1 farad is equal to 1000 millifarad, or 1000000 microfarad.
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Old 7th January 2018, 09:55 PM   #4
michaeljessen is offline michaeljessen  Denmark
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sorry. Microfafad is shortening uF. not mF. Thanks for the info.
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Old 7th January 2018, 10:57 PM   #5
Cal Weldon is offline Cal Weldon  Canada
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specification for the catode bypass cap in Tubelab SE
Or even fd. Which on a Mac is 'option m'
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