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Title: What Tube is it? Post by: n4wc 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?
Title: Re: What Tube is it? Post by: W3NP 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.
Title: Re: What Tube is it? Post by: Tom WA3KLR 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.
Title: Re: What Tube is it? Post by: WZ1M 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 Title: Re: What Tube is it? Post by: n4wc 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 ;-) Title: Re: What Tube is it? Post by: WBear2GCR 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 Title: Re: What Tube is it? Post by: W3NP 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. Title: Re: What Tube is it? Post by: W3RSW 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 ;D AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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