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Old 23rd May 2009, 07:59 PM   #1
losacco is offline losacco  United States
diyAudio Member
Join Date: Dec 2008
Default Heater wiring help!

My Hammond 270 has two heater taps, one 5volt and one 6.3volt. Both my 6CA4 and 5687 data says 6.3volts for both. Can I use the 6.3volt tap for both tube heaters or can I use the 5volt tap for one of the tubes?

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Old 23rd May 2009, 08:33 PM   #2
JohanB is offline JohanB  Sweden
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Join Date: May 2009
Location: Stockholm
The 6CA4 = EZ81 has a max 500 Volt between heater and cathode (h neg C pos). So no problem to use the same winding (6,3V) for all tubes. Be sure to have a good ground connection on one side or the centertap of the heater winding.

The 6CA4/EZ81 and almost all 6,3V-heater rectifier tubes with separate heater connections, was actually made to use the same heater winding as the rest of the tubes, despite the difference in cathode voltage. To be sure, you can check your tubes on http://frank.pocnet.net/index.html

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