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Author Topic: What Tube is it?  (Read 4277 times)
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n4wc
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« on: December 30, 2008, 05:35:45 PM »

I have a RCA electron tube #7358.  It looks like a 6146 type.  Inside the octagon on the glass is 7358 and below it is PDA.  On the metal base is made in USA 59-39.  Does anyone know what the specs are?
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Bill Cook
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« Reply #1 on: December 30, 2008, 06:10:42 PM »

The RCA transmitting tube manual lists it as a beam power tube for use as a rectangular wave pulse modulator. All of the ratings are based on duty factor and average "on" interval.
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---Dave  W3NP
Tom WA3KLR
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« Reply #2 on: December 30, 2008, 08:00:58 PM »

The release date is May 1959.  The "59-39" is probably the date code for 39th week of 1959.
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73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
WZ1M
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« Reply #3 on: December 31, 2008, 03:37:26 AM »

Beam power tube. T-12 bulb. Pulse modulator. 6.3 volt @ 1.25 amp heater. 3.5kv, 10 watt. Made by GE and Sylvania, may of 1959
Gary
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n4wc
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« Reply #4 on: December 31, 2008, 03:48:37 AM »

I think I had this in an Eico 720 back in the sixties.
Thanks for the info.
I'll have to scrounge around for a RCA transmitting tube manual ;-)
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Bill Cook
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« Reply #5 on: December 31, 2008, 08:15:54 AM »


You can find them in pdf for download online... google is useful for finding these things...

             _-_-bear
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_-_- bear WB2GCR                   http://www.bearlabs.com
W3NP
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« Reply #6 on: December 31, 2008, 09:02:02 AM »

I think I had this in an Eico 720 back in the sixties.
Thanks for the info.
I'll have to scrounge around for a RCA transmitting tube manual ;-)

Do you still have a rig that uses a single 6146? It looks like this tube would work. Basing, Mu, Transconductance, inter-electrode capacitance are all identical.

You probably did use it in the 720.
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---Dave  W3NP
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Rick & "Roosevelt"


« Reply #7 on: December 31, 2008, 10:39:34 AM »

Yeah, it sure sounds like a 6146 relabeled, possibly "ruggedized" and sold for three times the price  Grin

"If it walks like a duck....
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RICK  *W3RSW*
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