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Analog Squared Paper Discussion Thread. - Page 23

post #331 of 3704
Here is a link to the international / german website radiomuseum.org with a large list of vintage radio part ressources including a lot of tube suppliers:

http://www.radiomuseum.org/forum/north_american_suppliers_for_vintage_electronics_28_nov_11.html
Edited by GermanGuy - 6/8/13 at 1:55pm
post #332 of 3704
Quote:
Originally Posted by ianmedium View Post

Is it me or is there something very Fritz Lang about this amp!



According to my friend who is currently reviewing it the sound is amazing only exceeded by the heat!

Fritz Lang - that is a great association!
post #333 of 3704
Quote:
Originally Posted by GermanGuy View Post

PHILIPS DL92 - PA1 - L9C AND SECOND TUBE L8L

Found the complete philips code table - can be downloaded here:

http://www.pauls-roehren.de/downloads/PhilipsCodeListAB.pdf

With reference to this table:

PA -DL92

1 - Internal Code - nobody knows

L - Manufacturer - Bruxelles - Mazda

8 - Year 19x8 L - December

9 - Year 19x9 C - March


So i assume they were manufactured in December, 1958 and March, 1959

Can't think of the tubes being manufactured in late 1948 / early 1949.

Mr Künzig has just responded (yes at 11 pm) that he will also check the codes.


just got the message that my decoding of the tube codes is correct.

post #334 of 3704
So yours are from Belgium and made by Mazda who also made them at the Mazda factory in France. It will be interesting to hear what you think of them. I think it will be great to compare different countries versions of the same tube by the same manufacturer to see if there are actual differences. Thanks for the link as well I was coming up blank!
post #335 of 3704
Just looking at mine and am a bit lost other than country.

Both mine read.. PA1
R2C3

So, from that it means even though mine say "made in Holland" they were in fact made at Mullards Mitcham factory in the UK.

Not sure how to decipher the 2C3 though.

It does not come as a surprise that mine are not Dutch made. Phillips and a lot of other makers did this, stamp it is made somewhere where its not, that is more common than you would think! So, to get a similar sound to these Phillips one only needs to get the Mitcham made Mullard equivalent!
I love this, all the history and research!
post #336 of 3704
2C - February, 1952. - 3 - third week of month manufactured
post #337 of 3704
oh thats great, thank you!

So, my Phillips tubes are made by Mullard in Feb 1952, cool! Funny thing is they sound lighter than the other Mullards I have which I cannot explain, a little more delicate sounding. I just did a back to back with an early pair of Blackburn (UK ) made Mullards and the Blackburn ones which are lovely sounding just sound that little bit thicker than the Mitcham made ones, I wonder why that would be?
post #338 of 3704
What is nice is this pair are from the same batch which whilst not mattering so much in SET application is much more desirable in push pull.
post #339 of 3704

History of Mullard - http://www.r-type.org/static/makemull.htm

 


Edited by GermanGuy - 6/9/13 at 3:39pm
post #340 of 3704

ianmedium,

 

As assembling the valve components was predominantly done by hand - women were preferred for their manual dexterity and nimble fingers - the sonic differences might be attributed to individual worker skill. Another factor could be raw material sourcing, as obtaining the `ingredients' required to make valve parts was far more localized back then, so it's possible that the Blacburn and Mitcham factories used entirely different suppliers. 

 

Though the above is pure speculation on my part! Why not e-mail Steve at Mullard Magic and ask his opinion, as he is Mr. Thermionic! 

 

Cheers,

Andy.

 

Quote:
Originally Posted by ianmedium View Post

oh thats great, thank you!

So, my Phillips tubes are made by Mullard in Feb 1952, cool! Funny thing is they sound lighter than the other Mullards I have which I cannot explain, a little more delicate sounding. I just did a back to back with an early pair of Blackburn (UK ) made Mullards and the Blackburn ones which are lovely sounding just sound that little bit thicker than the Mitcham made ones, I wonder why that would be?
post #341 of 3704

GermanGuy,

 

Just heard from Mr. Kunzig and regrettably he doesn't have any LORENZ DF91/DF92 nor PHILIPS MINIWATT DL92 in stock. frown.gif

 

He does have Telefunken and Siemens valves, plus a few Valvo and Ultron. Does anyone know if the latter two makes are any good?

 

Cheers,

Andy.

 

P.S. I'm inclined to believe that ianmedium has bought the entire world supply of LORENZ DF91/DF92 and sits at home polishing the valve pins at night! wink_face.gif

 

Quote:
Originally Posted by GermanGuy View Post

just came home from the local dhl office with the parcel with the first set of philips dl92. received them in perfect condition, small parcel, everything carefully packed and wrapped.

 

post #342 of 3704
Quote:
Originally Posted by smial1966 View Post

GermanGuy,

Just heard from Mr. Kunzig and regrettably he doesn't have any LORENZ DF91/DF92 nor PHILIPS MINIWATT DL92 in stock. frown.gif


He does have Telefunken and Siemens valves, plus a few Valvo and Ultron. Does anyone know if the latter two makes are any good?

Cheers,
Andy.

P.S. I'm inclined to believe that ianmedium has bought the entire world supply of LORENZ DF91/DF92 and sits at home polishing the valve pins at night! wink_face.gif


That's too bad. My hopes are dimmed.
post #343 of 3704

woodcans,

 

It is a bit of a blow, as if a German tube dealer can't source any LORENZ what chance do us amateurs face acquiring them?!?

 

Cheers,

Andy.

 

Quote:
Originally Posted by woodcans View Post


That's too bad. My hopes are dimmed.
post #344 of 3704
Andy, shoot! You have uncovered my plans for world domination of Lorenz valves cool.gif

Nowing what little I do now I would not go as far as not recommending Telefunken, just make sure you get them cheap!

I have come to the conclusion mine were re brands rather than real Tele's as there is no diamond on the base.

Ultrons tend to be rebrand tubes of uncertain and questionable sound quality so I would steer clear of those. Valvo are highly regarded German valves and are part of the Phillips group, I have been trying to find some as perhaps they contain the best of all worlds, French panache, Tuetonic authenticity and air and a good solid tweedy bottom end from Britain!

As to alternatives to the Lorenz I would say the Siemens you and I purchased come within a hairs breath of the Lorenz's so I would personally recommend them as a suitable substitute for the Lorenz.

And for the Phillips, well basing the fact that my pair are Mitcham made Mullards rebranded Phillips I would say Mitcham Mullards but going back to your post a while ago Andy whilst there are sonic traits which can be counted on I think your hypothesis that it is down to the hand made nature goes some way to explain the differences, likewise slight changes in materials could do the same so I feel if one can ascertain that each pair comes from the same production batch that might be more useful that the differences in brands.

I do want to say as well having had this amp for some time and now having a good number of hours on tubes the sound does even out between the tubes as one puts more hours on them in my experience.

I think I will try another set of Tele's are some point though I have really had my eye taken with that mesh plate Mullard though I would have to find a pair!
post #345 of 3704

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Edited by seeteeyou - 11/4/14 at 11:20pm
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