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Analog Squared Paper Discussion Thread. - Page 166

post #2476 of 3704
Quote:
Originally Posted by xplosive View Post

my tur06 can only drive my beyer 880 pro 250 at not so loud volume.. It think it is best to drive up to 200 ohm headphones..

I think all of Shikada Sans amps only go up to 200Ohm. It would be great to see an amp come out that can drive up to 600Ohm eventually.. Having said that, knowing his bespoke nature he could probably do that if requested.
post #2477 of 3704

after i got the an email from the geman highend company making the custom transformers i already had ordered from them that due to whatever reason they could not manufacture small sized output transformers i cancelled that order and  today ordered two output transformers offered bei another german company.

 

these output transformers will not be the final ones but nice to test and listen to different impedance settings so optimizing the specs for the final highend output transformers. also they are much cheaper, about 37 euros each, but also good quality and at least should improve bass impact, depth as they are larger and have a much higher inductance and can be modified to even more imporove incuctance and so bass response.

 

btw - today i went to the local hobby market (they are specialized in custom woodworking) and discussed my ideas and then bought first wooden boards and other parts to make some shelfs and two racks for my equipment, all with four free rotatable wheels, so everything can be easily moved.

post #2478 of 3704

just checked ebay - the red letter brimars with stamp are really gone !

post #2479 of 3704
Quote:
Originally Posted by ianmedium View Post


I think all of Shikada Sans amps only go up to 200Ohm. It would be great to see an amp come out that can drive up to 600Ohm eventually.. Having said that, knowing his bespoke nature he could probably do that if requested.

 

as i have a hd800 i work on that  finding an output transformer that fits the internal size and can be used as replacement part for the existing tu-05 output transformers!

 

as i understood now pass response is related to the inductance and the inductance is related to the size, some problems for higher output impedance seem to be related to the relative high impedance of the dl92 tubes together with the relativ low power (but did not fully understood what i was told by one of the transformer makers, have to do some additional research).

 

in general one could order an output transformer with at least 16 and possibly 32 ohm secondary and 3 -5 -7 (seven for low impedance) KOhm primary impedance. The JAMES 6123 output transformers would be worth a try, but a try for nearly 200 euros ...).

 

but this is the reason i ordered this universal SE output transformers to see how low the primary impedance of the transformer can be choosen without loosing sound quality. the output impedance of the dl92 is about 8 Kohm, so if you connect it to the primary side of an se output transformer with about 1 to 2 Kohm which would be nessesary for the HD800, you have this typical impedance mismatch problem between tube and primary side of the output transformer.

 

will post some results after having received and tested this with the output transformers i ordered just to do this tests.

post #2480 of 3704
Quote:
Originally Posted by holeout View Post
 

Ordered the 05 long body (with RCA inputs and 1/4" + 3.5mm outputs) last month and should be expecting them in 2-3 weeks time. Can you also let me know where to get the Brimars or other tubes that match well with the Mullards? I bought the Mullards already.

Thanks GG.


It's not that easy to answer as for me it is not the question of the mullards but in general your sonic preferences and the headphones you want to listen to. some time ago i posted the following:

 

Quote:
Originally Posted by GermanGuy View Post
 


whatever you use as df91, i think the dl92's could be classified as follows:

 

philips dl92 - warm, textured, relaxing

tung-sol mil spec dl92 - neutral, detailed, precise

tesla 1L33 - bright, analytical

 

i don't know if it is just a matter of taste that you and ianmedium prefer the philips, but at least as ianmedium uses a t5p definetely brighter sounding than my DIY grado style headphone which has a much better bass extension (i can compare this as i also have a t5p) maybe it's the combination of amp AND headphone because often i find the one step less warm sounding dl92 tube better sounding.

 

the mullard dl92 could be classfied like the philips.

 

But also if one is looking for df91/1t4 (and don't forget the df904, 1u4, df96) or dl92/3s4 tubes, these tubes are all got more and more rare and much more expensive during the last month because the thread members and especially GermanGuy bought a lot of tubes now no more available. i stopped counting at about 130 tubes (but don't forget that you will use the amp maybe the next 30 years!).

 

also there are some available and at least to my ears excellent sounding tubes but they need a small modification to be used and (ianmedium would mention this if i do not now aand he is right) they are non standard tubes so using them at your own risk (but  both df97 and DL91 /1S4 running in my modded amp for more than 50 ours now).

 

all the 1s4 / dl91 i have have a richer and fuller bass than the dl92 i own, i love espeacially the PHILCO 1s4 and the SYLVANIA 1s4, also the RFT DF97 is excellent and to my ears one step up in resolution imaging, soundstage, precision to any other df tube i own.

 

my favorite set is the RFT DF97 - PHILCO 1S4 combo i can't stop listen to and always come back after listening to another combo (but non-standard).

 

so

 

- what are you listen to, genres

- do you like it bass-heavy, balanced, analytical

- which headphones (bass-heavy, balanced, analytical)


Edited by GermanGuy - 10/19/13 at 9:06am
post #2481 of 3704
post #2482 of 3704

MY UPDATED TUBE INVENTORY LIST:

 

DF91 / 1T4: 2x ultron - 4x telefunken - 4x valvo - 2x siemens - 2x lorenz - 2x radiotechnique - 2x rsd - 4x mullard - 4x brimar - 2x valvo red label

1T4T: 2x NEC - 2x tungsram

1U4 / DF904: 2x rca - 3x telefunken mil spec - 2x telefunken - 2x haltron - 1x jan - 1x sylvania

DF96: 2x lorenz - 4x philips - 2x rsd made by rft - 2x national

1F33: - 2x tesla (= DF96)

DF92: 4x mazda - 2x philips

DF97: 8x RFT

1F34: 4x tesla

DF61: 4x Lorenz (sub-miniature tube, for my mini tu-05  project)

DF668: 4x RFT (sub-miniature tube, for my mini tu-05  project)

DF669: 4x RFT (sub-miniature tube, for my mini tu-05  project)

 

DL92 / 3S4: 2x ultron - 4x telefunken - 4x valvo - 2x siemens - (6+4) x tung-sol mil spec - 4x mullard

DL92 / 3S4: 4x radiotechnique - 4x rca radiotron - 2x GE - 2x Ken Rad

3S4T: 7x orion

1L33: 4x tesla

DL91 / 1S4: 4x tungsram - 1x union - 6x philco - 2x rca - 1x standard electric - 4x sylvania

DL95 / 3Q4: 2x GE (only with new internal power supply, for my DL stage mod)

DL93 / 3A4: 2x Mazda  (only with new internal power supply, for my DL stage mod)

DL620: 5x Siemens (sub-miniature tube, for my mini tu-05  project)

 

UPDATED TU-05 TUBE COMPATIBILITY LIST:

 

DF91 STAGE:

 

tube same type heater voltage mA compatible (if) powersave mode remark
DF91 1T4, W17, 1K2, 1F3 1.4V  50mA yes, standard tube no tested
1T4T 1T4SF, DF96 1.4V  25mA yes, derived type no tested
DF904 1U4 1.4V  50mA yes no tested
DF96 1AJ4, 1F33, 1T4SF, EP202 1.4V  25mA yes, derived type no tested
DF97 1AN5 1.4V  25mA pin 4 and 5 connected no tested
1F34   1.2V  30mA heater voltage resistor no not tested yet
DF92 1L4, CV1758, 1F2 1.4V  50mA yes no tested
DF61   1.25V 25mA heater voltage resistor, tube socket adapter no not yet tested

 

 

DL92 STAGE:

 

tube same type heater voltage mA compatible (if) powersave mode remark  
DL92 3S4, VT-174, CV820 1.4V  2x50mA yes, standard tube yes tested  
3S4T   1.4V  2x25mA yes, derived type yes tested  
DL91 1S4 1.4V  100mA pin one disconnected no tested  
1L33   1.4V  50mA pin one disconnected no tested  
DL93 3A4, 2P3, CV807 1.4V  2x100mA amp can provide 2x100mA and enough power for anode yes NOT COMATIBLE  

 

(*) tube - TYPE - type bold blue means - standard tube

(*) tube - TYPE - type bold blue means - derived standard tube type - works

(*) tube - TYPE - type bold blue means - non standard tube - only with modification

(*) tested means - the tube will work, you can listen to music, no distortion etc. - there is no guarantee that tube bias is correct for a tube tested - wrong bias may result in less lifetime.

(*) standard tube means - tube type the amp was designed for

(*) derived type means - derived from the standard tube, usually for heating with half the current

post #2483 of 3704

I ordered the better part of GG's favorite combo. I know I'll have to jumper the pins on the RFT DF97. I got the Sylvanias for the DL92, which he assures me are very similar to the Philcos. Now I just need a TU-05. The wait is going to be long.

post #2484 of 3704

Sam Edwards - posted some details about the grado style headphone i usually use to listen to the tu-05 here:

 

http://www.head-fi.org/t/119314/post-your-grado-mods/4095#post_9903541

post #2485 of 3704

A friend of mine is making a feature length documentary about recording music direct to disk with a 78RPM. They have several great musicians in the show but for this forum, the interview with the tube guy is very interesting. 

http://vimeo.com/51845595

Anybody in NYC?

post #2486 of 3704
Sam, once again thank you!

Here is a link to an ebay listing of the most unusual 1U4 tube I have seen, its a solid state circuit in a tube!!

http://www.ebay.ca/itm/1U4-Solid-State-Replacement-Tube-in-Glass-Trans-Oceanic-/111193201131?pt=Vintage_Electronics_R2&hash=item19e3a199eb&_uhb=1


Processed By eBay with ImageMagick, z1.1.0. ||B2
post #2487 of 3704
would have ordered two, but only one available!
post #2488 of 3704
If you look on his description GG he has a web site selling them as well.. Here is the link.

http://www.solidstatetubes.com/1u4if.html


I am very much looking forward to the commencement of your amp build!
post #2489 of 3704
great link - he also sells 3V4 = DL94 = should work because no problem with the anode and bias grid voltage as i assume there are mos fet's inside.
post #2490 of 3704
So funny though, it will be a solid state amp then! biggrin.gif
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