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Old 27th August 2014, 03:07 AM   #1
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Default High voltage triodes (true triodes)

Are there high voltage triodes in addition to the 845?

Plate current and wattage are not important - I'd rather have a smaller tube than an 845, as a matter of fact.

What matters is I need to swing 1,000 volts on the plate.

I understand I can triode-strap the 813, for example, but what I butt-headedly want is a true triode that can handle at least 1,000 volts plate voltage.

The 845 is a great choice, I just wanted to check to see if any of you experts on triodes would happen to know of any other choices.

(And yes, I have one of those triodes that can handle 30 KV...I forget the special type it is or the tube number...but that's not what I want, either, LOL - I want a true triode with a plate voltage between 1,000 and 1,500 volts)

Very Best, Synchro27
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Old 27th August 2014, 03:44 AM   #2
Magz is offline Magz  United States
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833. I'm running it with 2300V on the plate, 160mA. 6E5P driver. Not only a true triode, a DHT as well.
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Old 27th August 2014, 04:28 AM   #3
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211 (VT-4C), 242A/C (same as 211), 212, 284 (same as 845) 8005, 805, 833A, 100TH, 100TL, 250TH, 250TL, 254W, 311CH, 810, 203A & 383 (zero bias types), 811A, 812A, 572B, HF100, HF200, 5867, 5868, 6569. And there are others but they are bigger and harder to work with or next to impossible to find.

Rereading your post the 212, 833A, 5868, 250TH/L & HF200 are all larger then you really want. The 8005 and 805 is probably your best bet.
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Last edited by HollowState; 27th August 2014 at 04:43 AM.
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Old 27th August 2014, 04:55 AM   #4
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Thanks very much. Yeah, I had forgotten about the 833A and monsters like LOL.

I see now I should have specified negative bias triodes only; the positive bias transmitting types are of no use to me.

If you happen to know off the top of your head, could you shorten the list to only the negative biased ones?

I don't want to seem ungrateful; I'm happy to look them up on TDSL.

Very Best, Synchro27
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Old 27th August 2014, 05:19 AM   #5
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thanks again, HollowState. I went through the whole list (I think).

The 100TL looks quite good. Up to 3KV, good for 100 watts. Negative bias. DHT. Nice. Really cool tube, would look great (under glass LOL). Ditto 100TH.

Not really what I'm looking for, but such a cool tube. $100 but hey, it's worth it. And it's a lot cheaper than an 845 unless you go Chinese...which is OK, but I really like going with an old original; I think I'll use it instead of the 845, because....

....I don't think what I'm looking for exists: a very low power small triode good for at least 1200 Vmax. I am not using it for power; I just want the plate swing.

Can't find the 284....if it ain't here, I doubt it exists (anymore): 30 to 698

Did I miss anything?

Thanks for the list - that 100TL is a FIND!!!!!!!! WOOOO HOOOOO!!!!

Very Best, Synchro27
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Old 27th August 2014, 05:58 AM   #6
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Magz I am a great fan of yours, and your website. Your grid driver is brilliant; I plan to use it.

HollowState, I was thinking the 100TL is seriously over the top for wattage I don't need, but....then I noticed the grid to plate capacitance and the amplification factor.

Waaaaay better than the 845!!!! Only 2+ uuF for the 100TL, whereas the 845 is much harder to drive with a grid to plate capacitance of 13.5, six times the capacitance of the 100TL!!! And, to boot, the 100TL has an amplification factor of 14...whoooo hoooo!!!! me like!!!!

My amp just transmogrified from an 845-based mu-stage to a 100TL-based mu stage heh heh heh heh. With that bulb shape and the white hot thoriated tungsten filament, it should look verrrrry cooooollll.

Now, if I could only find signal DHT's with amplification factors approaching at least 35...I need to get from standard line to a 75 volt swing to swing that 100TL grid....I hate to use 6922's cascoded, or 12AX7's CCS'd, but I guess I'll have to....sigh.

There wouldn't be any small signal DHT's with amplification factors of at least 35????? Hmmmm????????????/

Very Best, Synchro27
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Old 27th August 2014, 07:55 AM   #7
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Quote:
Originally Posted by synchro27 View Post
There wouldn't be any small signal DHT's with amplification factors of at least 35????? Hmmmm????????????/
Maybe the 1J6G? It is a dual triode tube, where the halves share a common cathode. But, the mu is pretty high, I think.
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Old 27th August 2014, 11:17 AM   #8
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What about the russian GM70: http://www.mif.pg.gda.pl/homepages/f...018/g/GM70.pdf

Regards,
Hilmar
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Old 27th August 2014, 12:38 PM   #9
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6HV5
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Old 27th August 2014, 01:58 PM   #10
Magz is offline Magz  United States
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Quote:
Originally Posted by synchro27 View Post
Now, if I could only find signal DHT's with amplification factors approaching at least 35...I need to get from standard line to a 75 volt swing to swing that 100TL grid....I hate to use 6922's cascoded, or 12AX7's CCS'd, but I guess I'll have to....sigh.

There wouldn't be any small signal DHT's with amplification factors of at least 35????? Hmmmm????????????/

Very Best, Synchro27
Not a DHT, in fact a tetrode (gasp!), but I can't say enough about the sound of the Russian 6E5P triode-strapped. Mu of 30-35, so you can run a two-stage, direct coupled design. The sound is excellent - clear, detailed, with depth and without harshness. Cheap, too! I bought 50 of them for $100.00!!
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