[Boatanchors] 5U4 vs 5Y3

[Glen Zook]

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".
 
Glen, K9STH


Website:  http://k9sth.com


On Saturday, May 24, 2014 2:04 PM, K7NKS via Boatanchors <boatanchors at mailman.qth.net> wrote:
 


When you say "testing purposes". What are you testing? How long? 

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. 

Good idea to check your fire extinguishers, fire/smoke alarms, and fire insurance.

73 Chuck K7NKS

Sent from my iPad

On May 24, 2014, at 11:33 AM, "Bob Jackson" <bob145 at suddenlink.net> wrote:

> Can a 5Y3 be subbed for a 5U4 for testing purposes?
> 
> Bob
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