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2359glenn | studio - Page 167

post #2491 of 10818

Here are pictures of a Telefunken and a Siemens C3g.

Wouldn't you say they were both manufactured at the same plant and just stamped with different brand names?

The code numbers and C3g font look the same.

...jus' wondrin'

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post #2492 of 10818
Thread Starter 

Can't wait to see the naked shots after dinner, Xcalibur255!

popcorn.gif

post #2493 of 10818

 

This was right after I finished cleaning them.  You can see the teeth marks on the bottom of the base where I had to chisel the aluminum canister off of them.  I thought about leaving them all glass which is what Yamamoto Soundcraft does, but the guide pin offers peace of mind during insertion plus the tapered base would let the socket be visible when it is not on the other tubes so I figured this was the way to go.  I really hope the first time I try to pull them out of the socket that the base comes along for the ride, I have no idea if my glue bonds aluminum and glass well.  I guess that is to be discovered when the time comes.

 

Clayton you make a good point about the factor stampings.  Maybe it is because production took place in one plant, or maybe it is because these were only ever really made for government use and they were required to adhere to a specific marking method and appearance.  There is really not much info on these tubes out there like you can find for a 6SN7 for example. Jac van der Walle suggests in his writings that more than one company produced these tubes, Siemens was just the biggest in terms of volume.  That would suggest different plants but it is just one piece of info to go on.

post #2494 of 10818
biggrin.gif
Quote:
Originally Posted by Xcalibur255 View Post




post #2495 of 10818

Quick note.... FWIW my C3g tubes were not marked like shown in the photo Clayton posted.  There was nothing stamped on them at all except for 'C3g' and the Siemens 'S' logo on the top.  I think we're seeing the difference between military and POST markings in this case as mine are military stock.

post #2496 of 10818

^I'm not used to seeing tubes that look SO CLEAN.  Nice share @Xcalibur255!

 

Also, thanks for sharing that link to the pic of your Sylvanias and your notes.  

 

(I was considering selling mine but with the KR-PX4 I am rolling back in some "upper-mids" tubes.)

 

Now I think that I am beginning to understand why many of you don't want to part with any tubes- you never know if you will need the tubes in a different amp (or for different phones) to find the tonality and presentation that you are looking for?

Reply
post #2497 of 10818
Thread Starter 

Thanks for the tremendous effort to bring the glass to light. Tubes are so beautiful to look at. After getting my first tube amp, I noticed a couple of weeks after routinely setting the tubes aglow that my "BP" dropped. eek.gif wink_face.gif biggrin.gif

post #2498 of 10818

Yes Thank you X!

 

My C3G don't have the post marking either:

I think I'll keep the metal top on for now.

 

And a size comparison of my GZ37 and GZ33:

 

Notice the GZ33 only has 4 pins in stead of 5. I suppose that's normal. confused.gif

post #2499 of 10818
Quote:
Originally Posted by Xcalibur255 View Post

 

This was right after I finished cleaning them.  You can see the teeth marks on the bottom of the base where I had to chisel the aluminum canister off of them.  I thought about leaving them all glass which is what Yamamoto Soundcraft does, but the guide pin offers peace of mind during insertion plus the tapered base would let the socket be visible when it is not on the other tubes so I figured this was the way to go.  I really hope the first time I try to pull them out of the socket that the base comes along for the ride, I have no idea if my glue bonds aluminum and glass well.  I guess that is to be discovered when the time comes.

 

Clayton you make a good point about the factor stampings.  Maybe it is because production took place in one plant, or maybe it is because these were only ever really made for government use and they were required to adhere to a specific marking method and appearance.  There is really not much info on these tubes out there like you can find for a 6SN7 for example. Jac van der Walle suggests in his writings that more than one company produced these tubes, Siemens was just the biggest in terms of volume.  That would suggest different plants but it is just one piece of info to go on.

I will check the sockets and how tight the socket grips to the ground pin with my tubes.

If it is really tight I will loosen it up I plan on still hooking it to ground that way the base

will be grounded and the whole tube if you ever use tubes with the shield left on. 

post #2500 of 10818
Quote:
Originally Posted by Ultrainferno View Post

Yes Thank you X!

 

My C3G don't have the post marking either:

I think I'll keep the metal top on for now.

 

And a size comparison of my GZ37 and GZ33:

 

Notice the GZ33 only has 4 pins in stead of 5. I suppose that's normal. confused.gif

Only 4 pins are used the 5th pin on the GZ37 is hooked to nothing most 5U4s are the same way

5pins and only 4 are used.   Pins 2 , 4 , 6 , and 8 are used sometimes pin 1 is there but not connected.

post #2501 of 10818
Quote:
Originally Posted by Ultrainferno View Post

Notice the GZ33 only has 4 pins in stead of 5. I suppose that's normal. confused.gif

 

Is that a Russian tube in disguise? With a saucer-type getter?

post #2502 of 10818
Quote:
Originally Posted by Oskari View Post

Is that a Russian tube in disguise? With a saucer-type getter?

I thought that it looked Russian as well. It has the same plate structure as my 5Z3.

post #2503 of 10818

Thanks for the help Glenn.

Quote:
Originally Posted by Oskari View Post

 

Is that a Russian tube in disguise? With a saucer-type getter?

 

Quote:
Originally Posted by Clayton SF View Post

I thought that it looked Russian as well. It has the same plate structure as my 5Z3.

 

It's actually a C&K Electronics GZ3 but I couldn't find anything on the tube or company. Pleas e do share if you have any info on them.

I first saw the tube on hupse.eu and then "accidentally" found one in Spain: http://www.hupse.eu/radio/tubes/GZ33.htm

post #2504 of 10818
Quote:
Originally Posted by Ultrainferno View Post

Thanks for the help Glenn.

It's actually a C&K Electronics GZ33 but I couldn't find anything on the tube or company. Please do share if you have any info on them.

I first saw the tube on hupse.eu and then "accidentally" found one in Spain: http://www.hupse.eu/radio/tubes/GZ33.htm

Here are more pictures of the Russian tube. Besides the different tube shape, do the internals of your C&K look like these photos?

Look at those spacers that are attached to the top mica and touch the inside glass structure.

AppleMark

AppleMark

AppleMark

post #2505 of 10818

New to the thread.  And no sorry - I didn't read every page.  biggrin.gif

 

Is this a custom build amp?  Can it be balanced?  Also where and how to purchase?

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