4033L- rare triode tube. - diyAudio
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Old 14th April 2012, 03:45 AM   #1
tcqanh is offline tcqanh  Viet Nam
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Location: HoChiMinh city
Default 4033L- rare triode tube.

I've just got a pair of 4033L STC tube. What do I make with this tube ?

Does anyone give me a suggestion ?

Tks,

QA.
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Old 14th April 2012, 04:02 AM   #2
nazaroo is offline nazaroo  Canada
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Join Date: Feb 2012
Location: http://goldentubes.blogspot.ca/
Quote:
Originally Posted by tcqanh View Post
I've just got a pair of 4033L STC tube. What do I make with this tube ?

Does anyone give me a suggestion ?

Tks,

QA.

It probably could be used as an audio triode,
but you'd have to keep to the lower voltage/current ratings,
since it can be operated differently at RF.

Plate: 400 volts
Grid: -20 volts
Plate current: .050 Amps
Plate dissipat. 16 watts
Load Z: 7,000 ohms
Low distortion output: 4 watts per tube.

RF values can be higher.

[PDF]

www.r-type.org/pdfs/4033a.pdf
File Format: PDF/Adobe Acrobat
TRIODES. The 4033-AF valve is identical with the 4033-A valve ; the -F code indicates that the valve has passed special tests for use in Standard Aircraft radio.
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Old 10th September 2013, 08:20 PM   #3
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Join Date: Feb 2012
Hi,

If you still have your 4033L tubes, you can make a nice small power amplifier with a simple stepup transformer and this tube. It will give 2W simply and nicely...

I once tried that and found it sounded good...

Julien

Ps: if you do not intend to use them, i might be interested in them... As I wanted to rebuilt a more completed amplifer with mine...
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