Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Engineering
Electrical Engineering
Questions about vacuum tube data sheets
Reply to thread
Message
[QUOTE="Planobilly, post: 5499423, member: 583423"] Hi Don, I have a very good supplier of tubes who can supply both new tubes and new old stock. I have been buying from Eddie at Eurotubes for a while now and I no longer have issues with tubes. They are hooked up with the JJ tube factory and I use JJ tubes where ever I can. I rarely have occasion to turn on my TV-10 Navy tube tester any longer. Of the dozen or so tube manufactures left in the world my experience has been they all make good and bad tubes. In most cases it is less about brand than how well the tubes are tested. [B]I don't think the new tubes are made as well as the old RCA tubes for example.[/B] The last couple of years that RCA made tubes were not as good as years prior to the end of the production. There was no reason to maintain the plant and the staff at the highest level if you plan to shut it down. Everything cost more today so tubes are made to fit the limited demand. I assume the guitar amp market is where most of the audio tubes go too now days. [B]I have found little reason to modify circuits as a result of lower quality new tubes.[/B] I pick certain brands for certain applications. A JJ GZ34 rectifier tube is closer to the original than a Solvtek. The Solvtek will put out about 15 Volts more than a JJ. This will cause the rectifier to have less sag and act a little more like a solid state diode rectifier which some don't like and some do. All guitar players are crazy, this includes me and perhaps especially me...lol I sometimes use new old stock but I find that it is rarely worth the money in guitar amps. For sure a NOS RCA 7025 is a better tube than a JJ ECC83 S but at over a hundred dollars for the RCA I have detuned my ears...lol There are certain places, like in very high end microphones, where buying the best tube you can get is logical. A couple of hundred dollars for a tube is a small part of the cost of a five to ten thousand dollar microphone. The bottom line from my perspective is to find a good tube vendor who can and will supply you what you need 99% of the time. Eddie gives me pretty close to exactly what I ask for and test every tube he sells me to include pre amp and inverter tubes. All the power tubes I get from them in matched quad sets run within two to three mA. 5mA is the excepted standard and few production amps hold to that standard now days. Tubes have always been a problem from day one till now, they cost too much, there too hard to make, they don't live a long and happy life, they use too much power, and produce too much heat. Having said that, I don't think they will be going away anytime soon. Cheers, Billy [/QUOTE]
Insert quotes…
Post reply
Forums
Engineering
Electrical Engineering
Questions about vacuum tube data sheets
Back
Top