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Analog Squared Paper Discussion and Appreciation Thread. - Page 182

post #2716 of 3498

you won't believe, but this small transformers work nicely with the tu-05 !!!!!!!!!!!!!!!!!!!!!

 

miss some refinement, in general they sound somewhat thicker, slightly congested, can be compensated by slightly attenuating the highs when using the hd800, with 32ohm headphones sound is much better!!!

 

ok herewith i announce that i have all parts for a mini tu-05 ready to build a four (only) tubes pocket SET tu-05 with the size of about two alo continental v2!

 

best of all with impedances from 32 ohm to 600 ohm, at the moment i am listening to the amp with small transformers and hd800.

 

i don't know if they have a gap (se output transformers, but the DC current is only 5.7 mA), but the volume level with the HD800 is such high that with the subminiature tubes the dc current could be reduced to about 2 mA.


Edited by GermanGuy - 11/11/13 at 2:44pm
post #2717 of 3498
My goodness GG, I know I am not responding much to your posts, its not because of lack of interest on my part (I am fascinated by your endeavours) but more that I could not contribute much in the way of thoughts as I am lost on all the technical stuff! You could explain and explain but I know it would just go right over my head, never been good at that sort of thing!
post #2718 of 3498

just listen to some heavy bass uk dub step, can't believe that a transformer that small is that good, will test this transfomers some time to see if they get magnetized!

 

now using the primary 10kohm and the secondary 150ohm impedance for my grado 32 ohm, sounds even better!


Edited by GermanGuy - 11/11/13 at 1:56pm
post #2719 of 3498

ianmedium - to be as short as possible- i will start to design and build a mini tu-05 with about a one third of the size of the standard tu-05 that can drive anything from 32 to 600 ohm impedance!


Edited by GermanGuy - 11/11/13 at 2:12pm
post #2720 of 3498
GG, talk about "taking the ball and running with it." My amazement continues...

Ian, one pair of 1952 RCAs=ordered. Thx.
post #2721 of 3498

to give you a feeling for the possible size - here is one of the output transformers (slightly smaller than the original one) with a subminiature DL620 100mW Output Pentode:

 

i am so happy i found this transformers because the output impedance of the DL620 driven with 45 volt is 20 kohm and this transformer is exactly designed for high impedances. and my main goal is not to play with electronics but to have a higly portable amp with nearly the sound quality of the original tu-05.


Edited by GermanGuy - 11/11/13 at 2:46pm
post #2722 of 3498
Quote:
Originally Posted by woodcans View Post

GG, talk about "taking the ball and running with it." My amazement continues...

Ian, one pair of 1952 RCAs=ordered. Thx.

Oh thats great! I think you will like them!
post #2723 of 3498
Quote:
Originally Posted by ianmedium View Post

Wowzers Boringer, you have some esoteric tubes there!

The Rogers are a Canadian company and from what I can gather their tubes are generally re-brands of other makes, especially Dutch made philips (the same company that make the famous Amperex bugle boys's)

Teonex were not a maker of tubes but a marketer so even though they may say made in England they could be from anywhere. I have seen though that a great many were in fact Mullards.

Those "Stamp" Philips are the most interesting. In shape they remind me very much of my Marconi's. Could you take a picture of the lettering for us close up. I might be able to find a factory code and let you know where they were made.

As WC said though. get yourself a pair of the philips DF96's he mentioned. As I said previously they are identical sounding to the Stuttgart Lorenz DF91's I have and are wonderful tubes, pair them with the Mullards (my Philips DL92's are Mullard made so sound the same as Mullards) and you have a beautiful combination of air, clarity and bottom end!

In the meantime I say try the Tungsram 1T4T/Mullard combo, that comes within a hairs breadth of the Lorenz/Philips DF96/Mullard/PhilipsDL92 combo in my experience.

Give them at least ten hours, preferably 20 and still expect some settling through 40 hours before they really come on song and quieten down.

 

Thanks a lot Ian. This is really helpful indeed.

I will start with those combination soon.

 

Meanwhile, here's the picture of the lettering on the Philips tubes.

I think those are a bit weird, as if someone has rewritten those letters on top of the original. :blink: 

 

post #2724 of 3498
That printing looks right Boringer, thing with these tubes is they are far less likely to be faked as they are so cheap and plentiful. I am not sure if I am reading it right but I think the "S" means they were made in Philips Barcelona Spain plant but I stand to be corrected on that. If I find anything different I will let you know.
post #2725 of 3498

Ahh.. Interesting... Thanks Ian... :beerchug:

post #2726 of 3498

I've placed an order for the Philips DF96. Thanks Ian and Woodcans... :beerchug:

post #2727 of 3498
Quote:
Originally Posted by Boringer View Post
 

I found this Philips Miniwatt quite interesting... :L3000:

 

Do you think, they're used one? :blink:

 

 

Well I have also one of those Philips DL92 (just one :(, not a pair ) and it is one of my favorite tube ! very good sound !  Wish I had a second one to make a pair :-)

 

 

 

 

they pair quite well with those " funy looking "  Mullard DF91

 

 

Processed By eBay with ImageMagick, R1.1.1.M1

 

 

or also with those funny looking MAZDA 1T4

 

post #2728 of 3498

Very nice valves and photo's. ianmedium will be envious that you have a pair of mesh plate Mullards as he covets them. :L3000:

 

Quote:

Originally Posted by bmichels View Post
 

 

Well I have also one of those Philips DL92 (just one :(, not a pair ) and it is one of my favorite tube ! very good sound !  Wish I had a second one to make a pair :-)

 

 

 

 

they pair quite well with those " funy looking "  Mullard DF91

 

 

Processed By eBay with ImageMagick, R1.1.1.M1

 

 

or also with those funny looking MAZDA 1T4

 

post #2729 of 3498
Quote:
Originally Posted by bmichels View Post
 
Well I have also one of those Philips DL92 (just one :(, not a pair ) and it is one of my favorite tube ! very good sound !  Wish I had a second one to make a pair :-)

 

Warning: Spoiler! (Click to show)

 

they pair quite well with those " funy looking "  Mullard DF91

Warning: Spoiler! (Click to show)

 

Warning: Spoiler! (Click to show)
Processed By eBay with ImageMagick, R1.1.1.M1

 

or also with those funny looking MAZDA 1T4

Warning: Spoiler! (Click to show)

 

 

Hi bmichels, glad to hear that those Philips are one of your favorite.

I will try to listen to them soon.

 

And I envy you for those Mullards and Mazdas.

Does the seller still have some stock left? :blink:

post #2730 of 3498
Quote:
Originally Posted by Boringer View Post

Hi bmichels, glad to hear that those Philips are one of your favorite.
I will try to listen to them soon.

And I envy you for those Mullards and Mazdas.
Does the seller still have some stock left? blink.gif

I bought them pn Ebay from 2 different vendors. Well it was à (good) surprise when i received the Mazda. I did not expected them to be like this. And as for the Mullard, i bought them this summer and at this time he only had 2. Sorry I can't help.
Edited by bmichels - 11/12/13 at 7:40am
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