[Boatanchors] 5U4 vs 5Y3

[Garey Barrell]

Also depends on DC voltage, and more importantly, C or L input filter.  A 5U4 dissipates 180W at 
300 mA and 500 VDC, with a CHOKE input filter.  Best Case.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Glen Zook wrote:
> The ratings in tube manuals for both the 5U4 and 5Y3 are somewhat confusing.  There is a rating given for each plate and that is generally around 80 mA for the 5Y3 and around 150 mA for the 5U4.  However, there are 2-plates in each tube and, when one looks at the figures for "half load" and "full load" give the actual performance of the tubes under most conditions.  The actual "normal" configuration of the tubes gives 150 mA for the 5Y3 under "full load" and 300 mA for the 5U4 under "full load".
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> Glen, K9STH
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> Website:  http://k9sth.com
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> On Saturday, May 24, 2014 2:04 PM, K7NKS via Boatanchors <boatanchors at mailman.qth.net> wrote:
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> When you say "testing purposes". What are you testing? How long?
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> The 5U4 is a big rectifier with substantially more capability than the 5Y3. Testing a hefty rig like a transmitter could really stress a smaller rectifier tube. Testing a small receiver should be ok for short time.
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