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Old 15th November 2007, 07:03 PM   #1
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Default TB3/1000 is alive ! ("European 833A")

Good evening DIYaudio,

after constructing the 833A-amplifiers (see the thread "where are the 833 amps"; i've included enough pictures and text) which works great i found a whole bunch of old European transmitting triodes.

Philips TB 3/1000

Although the filament is somewhat different to the 833A (12 V / 8 A instead of 10 V / 10 A) the other characteristics are quite similar.

So i changed the 833A-amps to take the TB 3/1000. Why: because the TB 3/1000 is VERY neatly made. Not like the 833A where the plate simply hangs on the top-connector. No...with the TB 3/1000 the structure is made from bottom up. And any expansion through the heat is being taken care by letting the plate slide on glass rods !

See pictures......it works.

And soundwise.....after 5 hours of playing......musical delight.

I'll add some pictures.
The first a comparison picture of a 833A and a TB 3/1000.

Regards,
Reinout
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Old 15th November 2007, 07:05 PM   #2
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Default TB3 1000 (2)

Next picture is the set working.

The amplifiers are monobloks....and their respective power supply is below the amp. The total amp weighs in at 280 kg.

Driver is a 300B.
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Old 15th November 2007, 07:08 PM   #3
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Default TB3 1000 (3)

Now a picture of the TB 3/1000 while running. And yes...it gets hot.
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Old 15th November 2007, 07:09 PM   #4
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Default TB3 1000 (4)

And a picture from the side of the (working) tube. Here you can see the glass rods on which the expanding/contracting plate can slide.
Very nicely made.

Regards,
Reinout
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Old 2nd April 2008, 10:02 AM   #5
swl1952 is offline swl1952  Germany
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Question 833..or similar

Hi Reinout`,
sprichst du Deutsch?
Ich designe grad nen 833c-amp....oder ähnlich..
willst mit mir in Contact treten?
Ich komm öfters geschäftlich nach Rotterdam..
LG
Gerd
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Old 4th April 2008, 07:47 AM   #6
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Default being abroad

Hello Gerd,

just received you message.
My German is hopeless....so it will be in English.

You have to wait a couple of months for i am not in The Netherlands now, were the actual amplifier, my home and all my data (schematics, values, etc) are. Sorry.

If everything goes according to plan i return late July.
Grtz,
Reinout
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Old 4th April 2008, 07:54 AM   #7
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Default 833 or similar

Helle again Gerd,

if you're looking at the 833C (i got a couple of them, sound nice, quite fragile on transport) please do consider alternatives like the TB3/1000. These older triodes are way superior in construction. And soundwise too !

There a a couple of alternatives: SRF and Philips made great triodes at 12 Volt in the 1930's , 1940's. some of them stayed in production for ages for they were never improved. They were already great. A shame that the productionnumbers were always low, even in those days these beauties cost a fortune.

Sorry again: you have to wait a while for i am travelling abroad.

grtz,
Reinout
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Old 4th April 2008, 06:52 PM   #8
swl1952 is offline swl1952  Germany
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hi Reinout,
Thanks for your replies......
Last week,i bought 2 Pieces 833C from China,included Bases and topcaps for 292Euros incl.tax.

I am planning now 2 years to build monsteramps....I own WE212C,,,Klangfilm RV230,,,a real Monster...but i own only 1 piece.
From GU81 i have about 10 Pieces...but this is a Tetrode,,,Then i saw the 833C for "small money" and i decided to take the 833Cs.
It would be a big help for me,if you can tell me the "working-points" of your amps....
Best regards
Gerd


Geplantes Design:
Ecl86 (lt Haas) 300B...Interstage Tango NC20(on stock) 833C
Gleichrichter:2 mal 866Rca
OPT...Custummade von EE (Haas)
Ua:1KV
Nutzleistung:20-40W

PS.: I would like to take an "European Tube" like the super TB3/1000,but i need at least 4 Pieces (2 in reserve) to build the amp,and the 833c is easy to get now.....****
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Old 4th April 2008, 07:31 PM   #9
EC8010 is offline EC8010  United Kingdom
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Splendid stuff, Reinout.
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Old 14th April 2008, 02:44 PM   #10
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Default 833c project

Hi Gerd,

first sorry for the late reply. currently i'm in Kandahar (Afghanistan) but tomorrow i'l be off to a new location. And this will be ongoing for the next couple of months.
To be honest i'm happy THAT i'm typing at the moment.....

The plan el86 - C - 300B - IT - 833C does seem feasable. That IT must be GREAT for it will shovel loads of milliamperes to the grid of the 833C. It depends on what voltages you're going to work but at 1000 volt we're talking at 250-ish milliamperes. Before frying your expensive Tango please chack if this can take that hammering. I have had a E96x55 tranny specifically designed to do that job.

Than the IT-ratio. Is it a 1:1-affair ? The 300b ahs a 3K-ish output and with a 1:1 IT this impemdance will feed the 833C-grid. that will not work for these kind of tubes want to be drive by LOW impendances. That's why my IT is a 1:4 downstepped interstage. 3K:16......less than 200 ohm. That works.

The beast in a 833c will be released by the combination of driving power (lots of miliampers) AND low impendance.
This is significantly different ot a 212C. This can be driven much easier.
To be honest: the output stage of my amp is simply large....but not difficult. The key-element in the amplifier is the driverstage !

I guess yu already searched through this forum at "where are the 833A amps ?" i have a lot of data, power requirements, voltages etc already put in that thread. Maybe for you to use. Currently i don't have details of all you questions available and it's a bit hard to do everything by memory.

When i return to the Netherlands you're much welcome !
I do have a serious stack of TB3/1000's. But they will not be for free. An 833C will be cheaper (to put in politically correct).

Once again sorry for the awkardly irregular responses.

Regards,
Reinout
(very pleased that there will be another 833-builder out there !)
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