Commercial available Tube/Valve buffered Line Preamplifier (OTL Headphone Amp) without Voltage Gain (= Unity Gain) Overview wanted
I am looking for an overview of commercial available tube pre- and OTL single ended headphone-amplifiers without voltage gain stage - i. e. only a cathode follower in the signal pad according one of this circuits:
OTL versions of "White Cathode Follower Power Buffers:
New Adventures in the White Cathode Follower
Simple Tube Math & White Cathode Follower Power Buffers (scroll down to the OTL versions of "White Cathode Follower Power Buffers")
Cathode Follower Circuits Overview:
https://www.pearl-hifi.com/06_Lit_Archive/14_Books_Tech_Papers/Broskie_John/1999/01_08_Oct_99.pdf
https://www.pearl-hifi.com/06_Lit_A...04/Sec_19/991_White_Follower_Optimization.pdf
Power Follower Version (Single Ended OTL)
More SE OTL & 32-Ohm Speakers
http://tubecad.com/2020/01/blog0489.htm
https://www.tubecad.com/2010/12/blog0195.htm
The only commercial available version I know in this kind is Audion's model "Silver Night Line" - go to
https://trueaudiophile.com/audion-silver-night-line-mm-phono-stage-pre-amp-new/
but it is probably a special edition because not listed on their own currently homepage - go to
http://www.audion.co.uk/pre-amps.html
OTL headphone amps like those under
https://drop.com/?origin=/buy/dark-voice-366se
and
https://theguruchoice.com/amplifiers/best-tube-headphone-amps-review/
unfortunately all with a lot of voltage gain along the signal pad and thus more or less colored sound character.
if there were such OTL headphone versions with only a cathode follower in the signal pad, that would be perfect .
In general, most clean, tight and neutral sonic character provide only a power follower topology, independent of the fact whether there are tubes or MOSFET/BjT transistors are in use.
Therefore I would like to know various brands and models of preamps in the kind of the above mentioned model from Audion.
Check out in this case also post #18 and #19 under
https://www.diyaudio.com/forums/ana...buffered-preamp-passive-volume-control-2.html
and pot #26 under
https://www.diyaudio.com/forums/everything-else/169484-wrong-op-amps-3.html
and post #85 under
https://www.diyaudio.com/forums/sol...-pure-classa-se-despite-low-idle-power-9.html
Thank you for an advice
P.S.: This URL's don't provide the wanted information:
https://www.diyaudio.com/forums/tubes-valves/58757-heretical-unity-gain-line-stage.html
https://www.diyaudio.com/forums/tubes-valves/59244-heretical-unity-gain-line-stage-ii.html
P.S. - II :
I am looking also for commercial available solid state line pre-amplifiers in this kind:
https://www.diyaudio.com/forums/pass-labs/309592-current-version-b1-buffer-preamp.html
go to post #16 under
https://www.diyaudio.com/forums/pass-labs/309592-current-version-b1-buffer-preamp-2.html#post6576099
I am looking for an overview of commercial available tube pre- and OTL single ended headphone-amplifiers without voltage gain stage - i. e. only a cathode follower in the signal pad according one of this circuits:
OTL versions of "White Cathode Follower Power Buffers:
New Adventures in the White Cathode Follower
Simple Tube Math & White Cathode Follower Power Buffers (scroll down to the OTL versions of "White Cathode Follower Power Buffers")
Cathode Follower Circuits Overview:
https://www.pearl-hifi.com/06_Lit_Archive/14_Books_Tech_Papers/Broskie_John/1999/01_08_Oct_99.pdf
https://www.pearl-hifi.com/06_Lit_A...04/Sec_19/991_White_Follower_Optimization.pdf
Power Follower Version (Single Ended OTL)
More SE OTL & 32-Ohm Speakers
http://tubecad.com/2020/01/blog0489.htm
https://www.tubecad.com/2010/12/blog0195.htm
The only commercial available version I know in this kind is Audion's model "Silver Night Line" - go to
https://trueaudiophile.com/audion-silver-night-line-mm-phono-stage-pre-amp-new/
but it is probably a special edition because not listed on their own currently homepage - go to
http://www.audion.co.uk/pre-amps.html
OTL headphone amps like those under
https://drop.com/?origin=/buy/dark-voice-366se
and
https://theguruchoice.com/amplifiers/best-tube-headphone-amps-review/
unfortunately all with a lot of voltage gain along the signal pad and thus more or less colored sound character.
if there were such OTL headphone versions with only a cathode follower in the signal pad, that would be perfect .
In general, most clean, tight and neutral sonic character provide only a power follower topology, independent of the fact whether there are tubes or MOSFET/BjT transistors are in use.
Therefore I would like to know various brands and models of preamps in the kind of the above mentioned model from Audion.
Check out in this case also post #18 and #19 under
https://www.diyaudio.com/forums/ana...buffered-preamp-passive-volume-control-2.html
and pot #26 under
https://www.diyaudio.com/forums/everything-else/169484-wrong-op-amps-3.html
and post #85 under
https://www.diyaudio.com/forums/sol...-pure-classa-se-despite-low-idle-power-9.html
Thank you for an advice
P.S.: This URL's don't provide the wanted information:
https://www.diyaudio.com/forums/tubes-valves/58757-heretical-unity-gain-line-stage.html
https://www.diyaudio.com/forums/tubes-valves/59244-heretical-unity-gain-line-stage-ii.html
P.S. - II :
I am looking also for commercial available solid state line pre-amplifiers in this kind:
https://www.diyaudio.com/forums/pass-labs/309592-current-version-b1-buffer-preamp.html
go to post #16 under
https://www.diyaudio.com/forums/pass-labs/309592-current-version-b1-buffer-preamp-2.html#post6576099
microZOTL Preamplifier - Vacuum Tube Preamp — Linear Tube Audio
"The ultimate expression of the microZOTL as a full-featured reference preamplifier and headphone amplifier."
The version with the input transformer (Lundahl).
Commercially available...
"The ultimate expression of the microZOTL as a full-featured reference preamplifier and headphone amplifier."
The version with the input transformer (Lundahl).
Commercially available...
Last edited:
This one I'm building a slightly modified DIY form 2xBH7A + 4x ecc99s (separate thread) but I'd recommend a larger PSU, larger coupling and larger output caps for 32ohm. He's indicated his is running hot. Mine will use 300W SMPS + 100W SMPS heater. However it will only draw the 130W+30W it needs from those SMPS.
Most 32ohm OTL cheaper designs tend to run 6SN7+6AS7/6550 etc.
10 Jaw-Dropping Vacuum Tube Headphone Amplifiers - Headphonesty
Some of those don't have OTs.