• 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.

Nanjing TM-85 Glass Vacuum Tube Datasheet

AbaddonD

Member
2015-08-20 1:49 pm
So I found this listing for a fairly big vacuum tube called a TM-85 and it's cheap, roughly $7.

The thing about it is that I can't seem to find a datasheet for it. I asked the seller to know if there's a piece of paper or something in the box that could maybe be the datasheet, but he said there's nothing in the box.

When you search online, the only things you find are either listings for it or some pictures of an amp that uses it.

Has anyone worked with this tube or do they have the datasheet for it? Seems like a good tube to make a series pass regulator with or maybe even a class A amp!

Thanks!
 

AbaddonD

Member
2015-08-20 1:49 pm
Pulse tetrode!
The filament voltage is 23.75 - 26.,25V,median value 25V.

Can it be used in a constant current circuit?
Unfortunately, I don't have any pulse vacuum tubes so I don't know how they perform under continuous load.
(Edit: Of course without exceeding the max plate dissipation.)

Also, thanks for answering. This was driving me crazy LOL
 
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6A3sUMMER

Member
2016-06-07 6:50 am
Just power up the filament and put it high on a platform in the middle of your amplifier.

I have seen commercial amplifiers that use tubes just for looks, but no signal applied.
And I have seen home built amplifiers that do the same.

If you want to look at pretty 'and' functional, put 'Josh Stippich amp' in your search engine. You will see a number of wonderful marriages of sheet metal and very large glowing tubes, and some of them very colorful too.
I have seen these live at the various VSAC's over the years (Vacuum tube State of the Art Conference's).
Long live VSAC (sorry to say, VSAC died after the last one in 2008).
I believe I may have seen some of Josh's work at the first Rocky Mountain Audio Fest too (2005?).
 
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AbaddonD

Member
2015-08-20 1:49 pm
Just power up the filament and put it high on a platform in the middle of your amplifier.

I have seen commercial amplifiers that use tubes just for looks, but no signal applied.
And I have seen home built amplifiers that do the same.

If you want to look at pretty 'and' functional, put 'Josh Stippich amp' in your search engine. You will see a number of wonderful marriages of sheet metal and very large glowing tubes, and some of them very colorful too.
I have seen these live at the various VSAC's over the years (Vacuum tube State of the Art Conference's).
Long live VSAC (sorry to say, VSAC died after the last one in 2008).
I believe I may have seen some of Josh's work at the first Rocky Mountain Audio Fest too (2005?).

I don't know.
I really don't like fake stuff.
I'd rather make a bad amp out of it than have something fake on an amp xD

Thanks for the Josh Stippich stuff. He has some cool looking amps.