• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

The ultimate 300B

Those are all cliches!
You forgot the audiofool: someone who always trust the magazines and buy only high end stuff with a high price tag. Otherwise, it couldn't be real high end.


If you never ate in a five star restaurant, how will you judge a meal?
Its impossible to judge between good or bad if not have auditioned the excellent ones.
You will get lost in the deep forrest of the audio world, hunting for every new parole.
300B triode is the ultimate? You want that ultimatively.
New digital audio is the best? You have to buy it.
Every new wave will capture you, not understanding how and why the principles of real quality audio engineering works. Once you understood, you will never get (audio)fooled again. Because physics don't lie. And marketing hate physics by nature.
 
look like a lot side to improve ...
300b load : too low ,low damping and high distortions
300b bias : work like a compressor and catode caps colored a lot
300b grid: put at last a grid choke will recover fast
psu is in serial to signal ...
use a tube diode
use inductive input LCL
use low R coke
do not put caps in serial
use a better filament psu for 300b
hope this help
you clone a dumble and too much of work for a diy 😉
 
Despite the low damping factor of the triode, it could deliver a very lifelike, articulated and colourfull bass to a good matched LOUDspeaker.
But again, you hve to hear what a good 300B is capable of, to believe it.


Gray, dear friend, is all theory and green of life's golden tree. (Faust 1, Studierzimmer. (Mephistopheles)
 
look like a lot side to improve ...
300b load : too low ,low damping and high distortions
300b bias : work like a compressor and catode caps colored a lot
300b grid: put at last a grid choke will recover fast
psu is in serial to signal ...
use a tube diode
use inductive input LCL
use low R coke
do not put caps in serial
use a better filament psu for 300b
hope this help
you clone a dumble and too much of work for a diy 😉

Blah-blah-blah, usual free, easy uglyness and jealousy from basic idiophile discourse, moreover showing his ignorance : another one in the foe list... 🙄 Good Bye ! And don't forget to take a copy of my schematic : who knows, if it worked better than you think ? 😀😉

Without pictures, it never existed.

A+!
 
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you are a commercial underground , don't try here! 😀😀

well you if don't understand what I write (in a constructive way) better you try a new hobby ops work 😉
is more then 100 year of 300B builds you cannot teach here
 
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I really think that the user "Tubelectron" doesn't have the theoretical basic knowledge of the so called
replacement circuit diagrams the user "nichok58" is referring here.
Those theoretical models are used to describe circuits in mathematics and you can learn from them in deeper studies of electronic circuit design.
I learned them in university. This is the theory behind the computer simulation models of PSpice.
Maybe this is all too abstract for him. He should have a very deep understanding to simulate those circuits.


His english is not too good, but his theorytical arguments are correct.
There are a lot of things to optimize in his circuit to become "ultimate". In this state presented, its just mediocre. Maybe just not that good.
 
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English is a wonderfully ambiguous language.

"Ultimate" simply means the final or last (version), in the same way that "penultimate" is one but last example. This means that if the original poster made ten amplifiers, the tenth one would indeed be the ultimate, even if it were not the best.

The implication that no further examples need be considered because the final example is also the best example doesn't necessarily hold true, although it is implied.

I have always wondered whether Europe's hit "The Final Countdown" had different lyrics on the demo version....
 
English is a wonderfully ambiguous language.

"Ultimate" simply means the final or last (version), in the same way that "penultimate" is one but last example. This means that if the original poster made ten amplifiers, the tenth one would indeed be the ultimate, even if it were not the best.

The implication that no further examples need be considered because the final example is also the best example doesn't necessarily hold true, although it is implied.

I have always wondered whether Europe's hit "The Final Countdown" had different lyrics on the demo version....


Maybe there is a difference in british english and american english.
In europe british english is teached.
So when google translates this word, foremost translation means "the best".
Further examples means best, highest, top of...
Ultimate and final have two different meanings here.


But maybe they should have called the song: "The ultimate countdown".😀
 
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This tube was intended to use in many applications, not only telephony (Loudspeaking telephone). For a repeater, not output power is relevant but high and noise free amplification. Pentodes were used for that application.
WESTERN ELECTRIC 455A Submarine Pentode Amplifier Tube

WESTERN ELECTRIC 175HQ Super-reliable submarine repeater tube

Siemens C3 tubes were the german equivalent.



WE was a big supermarket for electronics for all fields of applications. The last 300B tubes were employed in military voltage stablilizers and for that WE had to deliver replacement tubes.
But they were intended for the talkie amps, too. Later then for their "audio" amps.
 
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If there are no other specification differences between an Elrog 300B and a WE 300B,
Then this is this One Difference:

Thorium Infused? Tungsten Filament on the Elrog 300B

Barium? Coated Tungsten Filament on the WE 300B

And there seems to be another, but non-technical difference
WE specifications are widely published
Elrog specifications are not

Design an amplifier with a tube that does not seem to have specifications (or easy to find downloadable specifications).
Good luck.
 
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WE300B specifications is a copy of old production series.
Western Electric announced their new 300B years ago, and it is still not available...
It remains to be seen how they perform when finally hitting the market.
It would not be the first time that newly produced vintage stuff does not reach the quality of the original; Great Plains Audio producing Altec loudspeakers is an example.
Elrog 300B tubes are considered to be the best at the moment by quite some.
 
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