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Old 31st January 2013, 08:40 PM   #91
stajo is offline stajo  Sweden
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Quote:
Originally Posted by Wavebourn View Post
For military radio amplifiers. Originally were designed by Telefunken for their army and police.

http://tubedata.milbert.com/sheets/043/l/LS50.pdf
Telefunkens army and police. Sorry couldnt hold my breath. Ikoflexer, I'm sure the engineers will follow up on any schematic that is presented, as done already. The thread will end up in a state of the art thingy, if you just present the goals. You cant just up "headphones" since the standard there is not the common 4 or 8 ohms as in the speakerworld.

Merlin would like the lot choice. 600, 400, 200, 100, 50, 25. What does Sowter has to say about that?
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Old 31st January 2013, 08:41 PM   #92
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If possible also 300 ohms.
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Old 31st January 2013, 08:46 PM   #93
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Originally Posted by tinitus View Post
first time I'm here, and sorry to say, but I'm already totally confused
Yes there is a lot of offtopic yap considering the op goals...
try this to get us back on track...
4P1L | Bartola Valves
I found it looking up the tube the OP was gonna use,
scroll down for lots of info...
dennis h
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Old 31st January 2013, 08:52 PM   #94
stajo is offline stajo  Sweden
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I did a few listening test on my Beyer DT931. They are speced 600+ something. They are harch and twisty on that level and I prefer 200ish to my taste... Headphones is headphones. They are all designed (except some mentioned) to the common 200 ohm clausule.

Have anyone tried old tube radio OPTs? With maybe some lack in lower region I think they outperform newish stuff.

Staffan
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Old 31st January 2013, 08:55 PM   #95
tinitus is offline tinitus  Europe
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funny, Bartola's site looks like DHT Rob's new site

anyway, since a real SRPP preamp is said to be optimal only when designed for a specific low impedance load, I thought it would be ideal for headamps ?
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Old 31st January 2013, 08:56 PM   #96
iko is offline iko  Canada
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Staffan, I build things for myself, so my design goals are usually related to what I have. However, it's not too difficult to change a schematic to accommodate a higher impedance set of headphones. For myself I intend to wire my own output transformer if I can't find something reasonable to buy.

As for the topic, I think we're still on topic. As is the case with every thread, not every posting will be a schematic or comments on that schematic. Human nature...
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Old 31st January 2013, 08:58 PM   #97
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More or less what's the consensus schematic or ideas to make the headphone amp?
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Old 31st January 2013, 09:10 PM   #98
stajo is offline stajo  Sweden
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Quote:
Originally Posted by ikoflexer View Post
As for the topic, I think we're still on topic. As is the case with every thread, not every posting will be a schematic or comments on that schematic. Human nature...
Topic is still The all DHT SET Headphone Amp I hope since it would be nice to build one. If it will be more expensive then a sandloaded one is not the topic, because it sure will be. If the data is worse then a sand loaded one, that is to live with. I am following the original topic. Tho its to much fishing about what to drive. Drive 200, and you can compare to standard.

/Staffan
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Old 31st January 2013, 09:32 PM   #99
tinitus is offline tinitus  Europe
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how about 'the ordinary' 2A3 ....parafeed ?
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Old 31st January 2013, 09:59 PM   #100
iko is offline iko  Canada
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Quote:
Originally Posted by merlin el mago View Post
More or less what's the consensus schematic or ideas to make the headphone amp?
You might find that each of us will pull in the direction that each feels is better.
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