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.
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.
An externally hosted image should be here but it was not working when we last tested it.
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.
astouffer said: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
dowdylama said: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
Wavebourn said:I like graphite anodes. Like nickel anodes, they can run red without poisoning the tube.
Nickel running red? I've seen Moly specified to run red, as well as graphite( sometimes ), and Tantalum run to yellow-orange. Can Ni take the heat?
cheers,
Douglas
Bandersnatch said:
Nickel running red? I've seen Moly specified to run red, as well as graphite( sometimes ), and Tantalum run to yellow-orange. Can Ni take the heat?
cheers,
Douglas
No problem. I can run my GU-50 red, then adjust bias back, and measure still the same curves.
Transmitting tubes, especially for military mobile transmitters were supposed to run on an edge. I once saw a manual for a military transmitter that suggested to de-tune antenna to decrease transmitting range, until anodes got red.
However, it is a nickel alloy, not pure nickel, designed by Telefunken for Luftwaffe transmitters (LS-50 tubes).
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!
Gee, Jack Thanks man! I see your .02 worth of useless input is as good as mine. Just because I dont post regulary doesnt mean I dont what a tube curve is, or how to use one. The comment was refering to the $10.00 dollars that it would take to acquire some HY51A tubes from Vacuumtubes.net. But because you are so much more educated then some of us, I will be sure to direct any question I have to you my friend! Cheers
Vargas said:
Gee, Jack Thanks man! I see your .02 worth of useless input is as good as mine. Just because I dont post regulary doesnt mean I dont what a tube curve is, or how to use one. The comment was refering to the $10.00 dollars that it would take to acquire some HY51A tubes from Vacuumtubes.net. But because you are so much more educated then some of us, I will be sure to direct any question I have to you my friend! Cheers
I just hope that you know what a Vargas drawing is, in particular, a curvaceous Vargas drawing. Vargas was Esquire's pre-eminent artist. I will not post for fear of being sin-binned again. Perhaps you didn't get the reference.
Mirthfully yours in song and always cranky, I remain sincerely...thankfully our barber shop always hides the men's magazines on Saturday mornings...
I never thought it of that way! My thinking was always on the lines of a tribute to Alberto Vargas, the man behind the curvaceous beauty. Sorry for straying off topic. And no, you dont have to put the mens magazines away! Crap......that didn't sound right either did it. Cheers
Some of you people need to get a life! To be able to identify a tube based on its plate curves
I wasn't aware Radio Electric Supply was running www.vacuumtubes.net until they sent me an email. Oh well the search for another hidden gem continues....
I wasn't aware Radio Electric Supply was running www.vacuumtubes.net until they sent me an email. Oh well the search for another hidden gem continues....
Re: Loadlines
140W is a bit higher than 65W, isn't it?
Richard Ellis said:Looks like....
1000v
140mA
140W is a bit higher than 65W, isn't it?
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