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post #5131 of 8735
Quote:
Originally Posted by dailydoseofdaly View Post

You are referring to the plates, there are two smaller rectange pieces on opposite sides of the plates, that run from the top to bottom of the mica(thin metal horizontal circle). These are the sheilds and are commonly a chrome/silver color, if it matches the color of the plates(grey) that indicates its an older tube.

 

Mica is mica.  smile_phones.gif  (not metal, which would be electrically conductive, etc.)

 

http://en.wikipedia.org/wiki/Mica

post #5132 of 8735
Good call, makes sense
post #5133 of 8735
Quote:
Originally Posted by BobJS View Post

@HK .... like your new avatar .... is that new direct to space and back again vehicle?
 

No, that's the HL-10 lifting body that was used for testing in the 70's to help determine the best design for the space shuttle.  If you ever watched "The Six Million Dollar Man", that's the vehicle he "supposedly" had the crash in (although the only actual lifting body to crash was the M2-F3...the film of which was used in the opeining credits to represent Steve Austin's crash).  The good news is the pilot of the M2-F3 escaped with only minor injuries.

 

Lord Soth - how do the Lorenz CCa tubes compare to the 3-mica?  I wish someone could find another stash...

 

Cheers!beerchug.gif

-HK sends

post #5134 of 8735
Quote:
Originally Posted by solserenade View Post

 

Mica is mica.  smile_phones.gif  (not metal, which would be electrically conductive, etc.)

 

http://en.wikipedia.org/wiki/Mica

True!  However, I have seen some references and some tube sellers call the Siemen's tubes "tri-mica" even when there was just the two mica layers and the metal plate.  I really don't know why though...but they do seem to sound different from the "two mica" versions.

 

Just my observations...

 

Cheers!beerchug.gif

-HK sends

post #5135 of 8735
Quote:
Originally Posted by HK_sends View Post

True!  However, I have seen some references and some tube sellers call the Siemen's tubes "tri-mica" even when there was just the two mica layers and the metal plate.  I really don't know why though...but they do seem to sound different from the "two mica" versions.

 

Just my observations...

 

Cheers!beerchug.gif

-HK sends


If they are describing a tube with a metal plate as a third mica then it is just the lack of knowledge that was common to tube users when tubes were standard in everything that required them vs solid state. I was a radioman in the navy and all equipment except a couple of pieces had tubes. Just because someone sells tubes, even a lot of them, doesn't mean they really know tubes. I used to talk with a designer of the RCA tubes who had patents through RCA. It was a joy talking with him about circuits. It is a language but starts with correct understanding of the properties of tubes and goes from there. They are just a plug in circuit, which is what makes them fun, you can easily change the circuit, within certain parameters of course.

post #5136 of 8735
Quote:
Originally Posted by jamato8 View Post


If they are describing a tube with a metal plate as a third mica then it is just the lack of knowledge that was common to tube users when tubes were standard in everything that required them vs solid state. I was a radioman in the navy and all equipment except a couple of pieces had tubes. Just because someone sells tubes, even a lot of them, doesn't mean they really know tubes. I used to talk with a designer of the RCA tubes who had patents through RCA. It was a joy talking with him about circuits. It is a language but starts with correct understanding of the properties of tubes and goes from there. They are just a plug in circuit, which is what makes them fun, you can easily change the circuit, within certain parameters of course.

I agree it's probably due to lack of knowledge (it definitely is on my part).  All I can say is the top disk in the Lorenz 3-mica tubes looked like mica.  Anytime I looked at a Siemens tube that was advertised as a "tri-mica", I could only count two.  So maybe I'm not (so) crazy after all. wink_face.gif  Then again...very_evil_smiley.gif

 

Cheers!beerchug.gif

-HK sends

post #5137 of 8735

sending pm instead..

 

tubetestertrans.pdf 332k .pdf file
Edited by Iamnothim - 1/31/13 at 4:42pm
post #5138 of 8735
Quote:
Originally Posted by HK_sends View Post

No, that's the HL-10 lifting body that was used for testing in the 70's to help determine the best design for the space shuttle.  If you ever watched "The Six Million Dollar Man", that's the vehicle he .............

 

Lord Soth - how do the Lorenz CCa tubes compare to the 3-mica?  I wish someone could find another stash...

 

Cheers!beerchug.gif

-HK sends

Hi HK,

 

Your new avatar is really Retro "cool" and groovy in an Austin Powers kind of way! :)

 

I really lucked out on the Lorenz CCa "3 Mica" via EBay.

Won the pair for less than US$90.

 

As for the sonics, it will take some time before I can provide any input.

I prefer to burn them in for at least 100 hrs so as to level the playing field for a sonic comparison.

post #5139 of 8735
Quote:
Originally Posted by HK_sends View Post

I agree it's probably due to lack of knowledge (it definitely is on my part).  All I can say is the top disk in the Lorenz 3-mica tubes looked like mica.  Anytime I looked at a Siemens tube that was advertised as a "tri-mica", I could only count two.  So maybe I'm not (so) crazy after all. wink_face.gif  Then again...very_evil_smiley.gif

 

Cheers!beerchug.gif

-HK sends

Yes, I agree that strictly speaking the Lorenz 3 mica is a 2 mica with an extra plastic ( i think) top disc.

 

however the "3 mica" name has kinda become deeply entrenched in the minds of most Lorenz Stuttgart tube fans.

So we kinda know which variant we are referring when we mention either "2 Mica" or "3 Mica" Lorenz tubes.

post #5140 of 8735
Quote:
Originally Posted by Lord Soth View Post

Yes, I agree that strictly speaking the Lorenz 3 mica is a 2 mica with an extra plastic ( i think) top disc.

 

Plastics would outgas, a faux pas when you need to maintain a vacuum.

post #5141 of 8735
Quote:
Originally Posted by Oskari View Post

 

Plastics would outgas, a faux pas when you need to maintain a vacuum.

Yes, a thin sheet of glass then?

post #5142 of 8735

Why not mica?

post #5143 of 8735
Quote:
Originally Posted by Oskari View Post

Why not mica?

The top layer is transparent and unlike the usual opaque mica layers below.

post #5144 of 8735

A sheet of mica can be transparent as well.

post #5145 of 8735
Quote:
Originally Posted by Oskari View Post

A sheet of mica can be transparent as well.

 

The mica plates in vacuum tubes are usually opaque.

 

Any ideas why the manufacturer  would choose to use 2 opaque ones 

and a clear and transparent one on top?

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