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Post by Marty on May 19, 2020 14:40:55 GMT -5
I used to do some tube amp repair and modification. When I moved my shop to the Podium I stopped doing that work. But I still like tube amps and this guy has increased my knowledge immensely. If you want to understand tube amps and tube technology Uncle Doug explains it in simple terms. From how to read a schematic to building a tube amp from scratch, and I mean cabinet, chassis, everything, no kit. I really enjoy his videos, maybe some of you will to. |
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Post by brucemacneill on May 19, 2020 14:55:40 GMT -5
We studied tubes in college. Back them they didn't figure transistors would amount to anything because they couldn't handle any power.
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Post by aquaduct on May 19, 2020 15:14:03 GMT -5
Thanks. I'll probably check that out.
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Dub
Administrator
I'm gettin' so the past is the only thing I can remember.
Posts: 19,919 
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Post by Dub on May 19, 2020 15:34:09 GMT -5
We learned how vacuum tubes worked in 9th grade science class, or maybe earlier. That information has stayed with me all these several years so when I first encountered the term valve amp without any context I knew immediately they were talking about what we in the US call a tube amp.
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Deleted
Deleted Member
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Post by Deleted on May 19, 2020 16:21:52 GMT -5
Of course I'm gonna watch and share. Thanks Marty.
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Post by t-bob on May 19, 2020 16:28:21 GMT -5
I was tubing in a river.... a different tubing
great memories
gracias for the thread
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Post by jdd2 on May 19, 2020 18:41:22 GMT -5
Who is making tubes now? At one point is was the russians--still them, or now someone else?
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Post by drlj on May 19, 2020 19:05:52 GMT -5
Who is making tubes now? At one point is was the russians--still them, or now someone else? I have read that many now come from China. The Russians still produce a lot, too. |
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Post by t-bob on May 19, 2020 19:06:22 GMT -5
Who is making tubes now? At one point is was the russians--still them, or now someone else? I have read that many now come from China. The Russians still produce a lot, too. There are some key dates in the development of the thermionic valve or vacuum tube. These dates are tabulated in a valve history timeline below: VALVE HISTORY TIMELINE DATE EVENT 1640 Otto von Guericke first produces an air pump that is able to create a partial vacuum. A vacuum was required for the operation of thermionic valves. 1858 Julius Plucker demonstrates that magnetic fields can bend rays of what are later called cathode rays 1860 Joseph Swann patents the carbon filament lamp 1871 Sir William Crookes deduces that cathode rays consist of negatively charged particles. 1879 Thomas Edison files a US patent for a high vacuum incandescent lamp using a carbon filament 1883 Thomas Edison observes thermionic emission in a vacuum. 1883 Professor John Ambrose Fleming of University College London, presents a paper to the Physical Society on the 'Molecular Shadow.' 1885 Sir William Preece replicates the Edison effect and makes measurements, presenting a paper to the Royal Society. 1897 Guglielmo Marconi sets up his Wireless telegraph and Signal Company to exploit radio or 'wireless' technology. 1900 Ambrose Fleming becomes a consultant to Marconi. 1901 Marconi makes the first transatlantic radio transmission, but difficulties were encountered with detecting he signals 1904 Ambrose Fleming rectifies wireless signals using what he terms his oscillation valve - this is the first time the Edison effect has been used. It was a simple diode valve and sometimes referred to as a Fleming Diode. 1904 On 16 November 1904 Ambrose Fleming applies for a patent for his oscillation valve. 1906 Having undertaken many experiments, Lee de Forest in the USA adds a third electrode to Fleming's diode to produce what he termed his Audion. This device was still only used for rectification. 1908 Ambrose Fleming replaces the carbon filament normally used in the diode valve with a tungsten filament. 1912 Lee de Forest makes the first valve amplifier. 1915 In France the first hard vacuum triode was made. It was called the Type TM and during the second World War over 100,000 of them were manufactured. 1916 British equivalent of Type TM valve started manufacture - it was known as the R-Type valve. 1920 Capt. S R Mullard forms the Mullard Radio Valve Co. Ltd. This was to become a major manufacturer of valves and then transistors. 1920 Thoriated tungsten filament for valves / vacuum tubes developed by Irving Langmuir 1927 The first valve with a screen grid starts manufacture - the S625. 1936 The International Octal, or just octal base was introduced by RCA. 1938 Mazda introduce Mazda Octal valve base as competition to the International Octal base 1939 The Loctal base (B8B) valve base or tube socket was introduced in USA 1939 Philips introduce an all glass valve / tube with the B9G base. 1939 The B7G valve base introduced in the USA for use with all-glass vacuum tubes. Image a selection of vacuum tubes / thermionic valves including R-type, 6L6, ECC83, 6CL6, etc The valve history of tube history shows many improvements and developments are made to the basic concept. Over the years the performance the this technology improved beyond all recognition. Many different people each played their part in the history of the valve. |
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Post by Village Idiot on May 19, 2020 20:39:02 GMT -5
Want to know more about tube amps?
No.
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Post by drlj on May 19, 2020 21:10:01 GMT -5
Want to know more about tube amps? No. Grump. |
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Post by Village Idiot on May 19, 2020 21:11:11 GMT -5
Shut up.
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Post by Marty on May 19, 2020 22:06:11 GMT -5
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Post by mnhermit on May 20, 2020 8:53:18 GMT -5
Looking forward to getting lost in his videos someday. Thanks a lot
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Post by drlj on May 20, 2020 9:01:49 GMT -5
Where are the administrators who monitor this kind of abuse? |
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Post by theevan on May 20, 2020 9:01:58 GMT -5
I'll have to say, my stereo never sounded better than when it was all-tube, zero transistor. Paragon E preamp, Marantz 8b amp. The Paragon was fussy and hard to find somebody to repair it. Wish I had kept that Marantz though.
Mercifully, my hearing has declined sufficiently to think that my present setup sounds fantastic.
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Post by majorminor on May 20, 2020 13:27:12 GMT -5
Whoah. Just walked in to the little downtrodden local music store and they had a fairly clean and original blackface Pro Reverb someone just dropped off to consign for $900. Trying to find out what year but assuming '66 or '67. Plugged in and let it rip and sounded strong and both the splash and wobbly knobs worked great
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Post by Village Idiot on May 20, 2020 16:55:24 GMT -5
Where are the administrators who monitor this kind of abuse? I'm one of them. But don't worry, I just reprimanded myself. I did that through a personal message to me telling me to respect other members, even if it is drlj. I'm dealing with the repercussion, which has given me time to reflect on something I learned in this process that the rest of you folks might be interested in knowing. Did you know that you can send personal messages to yourself? Yes, you can. Check it out, it's pretty cool. |
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Post by drlj on May 20, 2020 17:30:09 GMT -5
Where are the administrators who monitor this kind of abuse? I'm one of them. But don't worry, I just reprimanded myself. I did that through a personal message to me telling me to respect other members, even if it is drlj. I'm dealing with the repercussion, which has given me time to reflect on something I learned in this process that the rest of you folks might be interested in knowing. Did you know that you can send personal messages to yourself? Yes, you can. Check it out, it's pretty cool. Talking to yourself in print? You know, I like the idea. |
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Post by millring on May 20, 2020 17:35:08 GMT -5
Did you know that you can send personal messages to yourself? Yes, you can. Check it out, it's pretty cool. You'll go blind. |
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