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Old 29th May 2003, 08:29 PM   #1
karma is offline karma  Canada
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Arrow rectifier tube 5u4g

i have started a new pre amp and was wondering if i could just
use this rectifier tube i have no small ones left. im sure i can just wondering if anyone used bigger rectifier tube on a small pre
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Old 29th May 2003, 09:30 PM   #2
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I love the big bottle 5U4's. There's no reason why you SHOULDN't use it

-Maz
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Old 29th May 2003, 09:30 PM   #3
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Hi,

Quote:
i have started a new pre amp and was wondering if i could just
Can do, but IMHO you best feed it for a highish voltage and reduce it from there...a lot of voltage gets wasted that way, generating a lot of waste heat in the process.

To be perfectly honest with you I haven't tried a 5U4 at low voltage but it sounds off to me...

A few damper diodes would do nicely though and they're still cheap as mudd.

Cheers,
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Old 29th May 2003, 11:40 PM   #4
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its fine, if you dont mind wasting power..
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Old 30th May 2003, 12:11 AM   #5
karma is offline karma  Canada
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good ill use it i love to wast power lol
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Old 30th May 2003, 12:29 PM   #6
Joel is offline Joel  United States
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5U4 has a 3 amp heater - make sure your PSU is up to the task.

I'm not sure what power everyone thinks he will be wasting though - the voltage drop over a 5U4 is significantly less than over a 5Y3 for example. How much voltage does the circuit need?
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Old 30th May 2003, 03:30 PM   #7
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Hi,

I am actually thinking of using a 5U4 rectifier for a 6SN7 separate PSU preamp design soon.

The advantage of this approach is that you can actually adjust the voltage using resistors in the separate PSU and build a new preamp at half the cost if you get tired of listening to it. You have to select a mains transformer with 12.6V tappings which you can convert to 6.3V readily.

This is however a non-purist model, usually have to work backwards to calculate power requirements and use small values of resistors as possible and appropiate rectifier tube.

Some others also say the 5U4 is way over kill. Yes it seems like running an aircraft engine on a small motor cycle. But that's what DIY people often do. Getting all those military stuffs, Black Gates, Kiwames, oversized mains and output transformers, hospital grade power plugs etc.

It's not for everyone, but no harm trying with a Sovtek and see if you like the end result. It's good to have a open mind for these things. You never know.
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Old 30th May 2003, 09:39 PM   #8
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Default WASTELAND.

Hi,

Quote:
I'm not sure what power everyone thinks he will be wasting though
That 3A heater is what I meant, Joel.

Considering it's probably for a linestage pre it seems overkill, don't you think?

Cheers,
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Old 1st April 2004, 02:12 AM   #9
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Hi,

I need to use a 5U4G for a friend's preamp. The preamp needs a B+ of 330VDC. I downloaded the datasheet of 5U4G and looked at the pinout but can't figure out how to wire it. I was told this is a "Flaming Valve" and the output voltage is taken from the filaments?

Can anyone please give me a circuit that shows the wiring of this diode? I am so confused with this filament output scheme and I don't want to blow-up my friend's 5U4G.

Thanks!
JojoD
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Old 1st April 2004, 02:23 AM   #10
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Hi,

This is a typical circuit using a cap input supply:


Cheers,
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