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Title: OPINIONS: Which Tubes Post by: David, K3TUE on March 24, 2007, 05:34:39 PM I would like to know, is there somewhere a good survey of tubes and their common application and perhaps opinions them in those applications? I know there are a lot of tubes and perhaps this is a silly question, but I was just wondering if anyone had stumbled upon such a thing.
Title: Re: OPINIONS: Which Tubes Post by: Jim, W5JO on March 24, 2007, 08:18:57 PM Dave, probably everything you want to know about application is in a transmitting tube manual except opinions. ;D
Title: Re: OPINIONS: Which Tubes Post by: W2PFY on March 25, 2007, 09:25:14 AM try franks tubes for specs. There are many others but this one seems to have the most.
da dit da. http://frank.pocnet.net/ Title: Re: OPINIONS: Which Tubes Post by: K6IC on March 25, 2007, 12:15:01 PM And,
There is always the older ARRL Ham Radio Handbook. The back pages list tubes, in categories of RX tubes, Triode transmitting and Tetrode/Pentode tubes usually in ascending plate dissipation ratings. The mid sixties is about the limit of usefullness of these tables, as solid state begins to nibble at the edges of these listings. The tables are really just data, and no opinion, but useful. These handbooks in conjunction with the construction articles in the HB's and QST should be a big help. Good Luck Vic K6IC Title: Re: OPINIONS: Which Tubes Post by: w3jn on March 25, 2007, 12:50:42 PM If you're gonna homebrew something, pick tubes that are cheap and easy to find.. There are plenty of cool construction projects in '50s magazines that unfortunately use unobtainium tubes nowadays.
Anything using 1625s (12V fil version of an 807), 2E26s, 5894s, 4-400s, 811As, 6CL6s, etc., is gonna be much easier to find replacements for than that PL172 modulated by a pair of V-70Ds driven by a KT88 ;D Title: Re: OPINIONS: Which Tubes Post by: W3SLK on March 25, 2007, 02:47:34 PM Don't for get the venerable 813!!!
Title: Re: OPINIONS: Which Tubes Post by: David, K3TUE on March 25, 2007, 08:00:54 PM Just Curious, what are the tubes depicted in this pic?
(http://amfone.net/Gallery2/d/206-2/PICT2576.JPG) http://amfone.net/Gallery2/d/206-2/PICT2576.JPG (http://amfone.net/Gallery2/d/206-2/PICT2576.JPG) Title: Re: OPINIONS: Which Tubes Post by: Ralph W3GL on March 25, 2007, 10:40:04 PM 872B's in the rectum fryer area of W2PFY's circle bar W -- MW-2 4KW AM radio... Title: Re: OPINIONS: Which Tubes Post by: w3jn on March 26, 2007, 06:51:37 AM Could be 8008s?
Title: Re: OPINIONS: Which Tubes Post by: W2PFY on March 26, 2007, 07:12:33 AM Well guys, thanks for the interest in my transmitter. The rectifier has six 872A's in the three phase Hv for 4 KV at 4 amps. The two on the right are for 400 volts positive at 1 amp. The two on the left are 4B32 gas rectifiers that supply 400 volts negative at 1 amp. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
The rectifier weighs 800 pounds and that’s without the plate transformer. That is outside of the cabinet. The Westinghouse MW-2 can put out 2.5 KW am or 3KW on CW. I have the power transformer set on the lowest tap and it’s just under the limit. The rectifier was designed to operate three transmitters and modulators at the same time at reduced output. Most likely, each transmitter would have been adjusted to put out about 1.2 KW on AM. It makes a lot of noise but it’s fun to operate. It can be heard on the Audio vault here on G’s site or on the air once in awhile. I’ll be up there at the transmitter location this coming weekend. If anyone would like to work me on it, let me know. Her is a link to more pictures, http://picasaweb.google.com/WW2PFY/W2PFYStationPhotos |