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Looking for several current and reliable resources (i.e., known to stock these tubes) for Amperex and Siemens vintage 6922s, CCa & 7308s who are fair within an already against the wall priced market. :)
Thanks for taking the time to view and respond.
Interesting question. I never figured out how tube dealers resource any tubes. Military auctions is one, but likely a weak source now.
I do know how Tube World resourced many old WE & other tubes though. Did I say AT&T old tube stocks?
and I am not sure why. I remember a few years ago when he had some NOS GZ35 metal base and he told me he sold them to Tube World for 50 dollars each. The were going for around 2 or 250 at the time and TW most likely got more but why he would sell something he could have sold for much more I don't know but it is one way of TW getting many tubes.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
If you plan to use these in a higher sensivity application, be sure the seller tests and guarantees against noise/microphonics. Also look for the Siemens tubes with the acid etched code towards the bottom of the tube not the vintage in which the code is inside the tube on a metal tag.
This stated generalisation doesn't quite apply to Munich manufactured E88CC tubes made during the period from mid 1965 to the end of 1965 with the 3-lined A-phi code stamped onto the aluminium clad inside the tube's glass envelope. These tubes are commonly found relabelled as RCA and are just as good as the earlier revision 1960 to mid 1965 vintage with the codes etched outside on the glass envelope.
Yes, absolutely, in terms of noise/micophonics guarantee...as well as a tight match in gain and plate current. Thank you.
Can you say more about "the why" or the difference in the vintage Siemens with date code etched on the outside bottom vs the inside metal tag, please?
"Yes, absolutely, in terms of noise/micophonics guarantee" .
"...as well as a tight match in gain and plate current."
Why? There are really not that many circuit designs that demand/call for matched tubes. So unless you have gear that requires matched tubes, you are driving up your costs and limiting your selections unnecessarily.
Just like in a car - if it doesn't need higher octane fuel, putting Premium in it won't make it run any better - it'll just cost more.
My apologies... when I first read your response to my reply to JNS... I thought you had mistaken the "Why" I had asked JNS regarding the difference between the Siemens with the codes etched on the outside of the tube versus the ones with the metal tags inside the tube. :)
Regarding tube matching. Personally, I never believed given that you are dealing with two tubes of the same type that tight matching of the gain and plate current between the two was critical.... but I was under the assumption that it was preferred particularly in designs where you can't manually bias the tubes.
But, now that is has gained my interest, I will check it out with Fred Volz who designed both my amp and preamp... as well as with Thorsten who designed my DAP. I appreciate your advice I don't need to be spending money where it is not necessary especially when it comes to vintage 6922s.
I totally get what you are saying... My question to JNS was:
why the preference for vintage Siemens with the date code etched on the outside bottom vs the inside metal tag?
And, I will check with the manufactures of the DAP just how closely, if at all they need to be matched as output tubes. However, when it comes to the vintage 6922s, it doesn't seem to matter whether you are buying single or matched in terms of price...
Its been a while since I've shopped for some, and stocks fluctuate periodically, but you can try:
Thanks, Jack... Yes stock definitely does fluctuate... Kevin seems to have a strong selection currently and is top-notched in terms of reliability.
He handles the EU tubes. The quality of his tubes is very high. I have always been very pleased with tubes I have bought from him.
Observe, don't think
I second Roland - ordered European tubes from him several times, incl. Mullard and Teles El-34...
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