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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

4033L- rare triode tube.
4033L- rare triode tube.
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Old 14th April 2012, 04:45 AM   #1
tcqanh is offline tcqanh
diyAudio Member
Join Date: Apr 2011
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 ?


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Old 14th April 2012, 05:02 AM   #2
nazaroo is offline nazaroo  Canada
Join Date: Feb 2012
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 ?



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.


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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, 09:20 PM   #3
Jsullerot is offline Jsullerot
diyAudio Member
Join Date: Feb 2012

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...


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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