It is exactly how I powered my last version of headphone amp, before the project had been postponed. Except the bottom PS was actually a shunt regulator, in series with upper 2 power supplies.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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I agree with Anatoliy, I would definitely do that for the bottom supply, make it a really good shunt regulator, to have outstanding low output impedance.
Nicely folded aluplates there Anatoliy. I too is allergic to stupid smallish signal tubes sticking up for no reason and prevent decent stacking.
Nice looking toobs to be shown, the rest can rest.
Staffan
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Thank you Stafan.
When I show tubes I always protect them somehow, like transformer box behind, cheeks on sides. Like here, for example:
Well GU50s I would show, if not for the spectacular "pull-out-and-replace-hotties" arrangement. I beleave those were designed for cannons, werent they?
/S
Sorry for OT. I follow the thread. My half nickel is that I am most curious about designs that meets designgoals, not just show excellent figures in relation to nothing (1 Mohm resistor so). Preamps, especially anodefollowers, for example. Most data is useless unless you know what you load it with.
Keep up, interesting thread!
Staffan
Keep up, interesting thread!
Staffan
I think the people currently active in the thread are keen on building a good headphone amp, regardless of design goals. There's a good chance we lack any real engineers though. 🙂
Just for the interest. How can you build something that is good if you dont know what good is and what its for?
/Staffan
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?
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
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
Have anyone tried old tube radio OPTs? With maybe some lack in lower region I think they outperform newish stuff.
Staffan
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 ?
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 ?
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...
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
You might find that each of us will pull in the direction that each feels is better.