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Old 27th May 2009, 12:29 AM   #1
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Default How do these curves look?

So I've stumbled upon a DHT with some good initial specs and don't want to say anything and make the price skyrocket. Here is a picture of the plate curves.

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Max Vp = 1000
Max Pd = 65 watts
Max Ip = 155 Ma
Max Ig = 25 Ma
Mu = 25
Gm = 6500

Anything stand out that makes this tube not suitable for SE? Plots and loadlines aren't really my thing so I'm wondering how you get a rough idea of the Rp? Thanks.
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Old 27th May 2009, 12:44 AM   #2
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I think no. Though, PP may work fine with 1KV B+. What G1 voltage is needed for 25 MA current?
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Old 27th May 2009, 02:27 AM   #3
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Here is the typical operation for class B audio and C RF.

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Old 27th May 2009, 02:58 AM   #4
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Not bad for a $10.00 dollar tube! Cheers
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Old 27th May 2009, 03:38 AM   #5
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Anytime anyone with the name VARGAS responds to an inquiry with respect to curves, one's ears [sic] have to perk up, particularly those of us who perused our bachelor-uncle's Esquire in the 1950's!

Alberto, we are unworthy...
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Old 27th May 2009, 11:12 AM   #6
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hey-hey!!!,
I know those curves anywhere. If you've found a decent supply, would you be so kind as to drop me a note? I need to fill out a quad and have so far found them rather hard to find.
cheers,
Douglas
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Old 27th May 2009, 02:54 PM   #7
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The replies so far are very interesting. I'm definitely ordering a few now...
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Old 27th May 2009, 03:39 PM   #8
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Quote:
Originally posted by astouffer
The replies so far are very interesting. I'm definitely ordering a few now...
Are you looking at the Radio Electric Supply listing? If you are, save them the call...they've got none at all, either A or B version.
cheers,
Douglas

they've got no HY40 either, though it is only 2/3's the HY51
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Old 27th May 2009, 05:08 PM   #9
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Have you experimented with them Douglas?

Jim
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Old 27th May 2009, 05:34 PM   #10
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Quote:
Originally posted by dowdylama
Have you experimented with them Douglas?

Jim
Hi Jim,
Besides lighting them up and confirming the shape and location of the grid=0V line, not yet. I have been considering a MI-9355 sort of amp for them, perhaps even with a clone of the original input TX. 14k a-a with a 1kV B+ should load them nicely. I have not decided on making it a stand-alone or if it should have its driver amp on board.

They're competing with a half-lit 304TL power final...the higher mu is nice, but at the expense of higher plate Z. But if running horns well above cut off, the high output Z( v. the 152TL ) would not be the issue it is with air suspension and bass reflex, eh?
cheers,
Douglas
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