[Jukebox-list] 6973 tube

[Bob E.]

At 12:14 AM 9/11/06 +0200, you wrote:
>6CZ5
>6CM6
>6EM5
>three replacements for 6973. None of them are as tall as the 6973, and I
>believe there is a relation between the physical size of a tube and the
>power it can handle. Thus the lower output of the replacements.
>
>Someone more knowledgeable in tube electronics should be able to elucidate.

>From the RCA Receiving Tube Manual (Edition RC-22)


					6CM6		6CZ5		6EM5           6973

Heater Voltage				 6.3V   	  6.3V		6.3V           6.3V
Heater Current				  45mA		  45mA		 80mA           45mA
Transconductance			5000u		4800u		5100u           4800u

DC Plate Voltage (max)			315V		 350V		 315V           410V
Grid #2 Voltage (max)			285V		 315V		 285V           410V
Peak Neg. Pulse Voltage, Grid #1       -250V		-275V           -250V
Peak Cathode Current			120mA		 155mA          210mA
Avg. Cathode Current			 40mA		  45mA           60mA
Plate Dissipation			  8w		  10w            10w   		 12w


Bottom line seems to be if you are using subs, you should adjust the
voltages accordingly
so that maximum conditions specified for the particular tube are not
exceeded.  Also note
that the 6EM5 draws considerably more heater current, make sure you have enough!

--Bob
=======================================================================
Bob Ellingson					bobe at halted.com
Halted Specialties Co., Inc.			http://www.halted.com
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