My Tube Collection, Welcome to share yours
- Thread starter adrian cheng
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These are Amperex medical 12AX7 from the Electronics for Medicine. These were made in Holland.
Amperex Herleen factory, 1963 codes (if I decoded it correctly).
Amperex Herleen factory, 1963 codes (if I decoded it correctly).
These are interesting - Telefunken label, marked "SELECTED TUBE". Red tip. Made by Mullard. So .... why would Telefunken need Mullard to make them a tightly balanced, low noise, selected tube? Surely, they could produce them.
Date codes are Mullard.
Mullard Blackburn August 1967. ECC83 3rd production change.
No Telefunken <>, but there is an E.
Another one ---
Date codes are Mullard.
Mullard Blackburn August 1967. ECC83 3rd production change.
No Telefunken <>, but there is an E.
Another one ---
Here is a nice quad of GEC U52 or 5U4G rectifiers.
Hammersmith factory indicated by the Z code on the glass. VB is February, 1964 (if decoded correctly).
Hammersmith factory indicated by the Z code on the glass. VB is February, 1964 (if decoded correctly).
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These are 1962 GE 6BL7 GTA. These tubes were used in televisions for the vertical deflection and oscillator. They are a dual triodes with black plates and great for audio circuits. My amps use these tubes.
I also have the older 6BL7 GT from RCA and Sylvania.
I also have the older 6BL7 GT from RCA and Sylvania.
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Here is a nice quad of CV717 or 5R4GY rectifiers.
KB = K is manufacturing spec K1001 or K1006, B is for qualification by a UK authority
FE = STC, Oldway which is Standard Telephones and Cables, Oldway, England
U = 1963, E = May, F = June
KB = K is manufacturing spec K1001 or K1006, B is for qualification by a UK authority
FE = STC, Oldway which is Standard Telephones and Cables, Oldway, England
U = 1963, E = May, F = June
These are U52 or 5U4G on the box and labeled Philips CV575 on the tube.
Tube code is 7C2 J5K.
7C = 5U4G with change code 2.
J5K = Mullard Tottenham, November 1955.
Tube code is 7C2 J5K.
7C = 5U4G with change code 2.
J5K = Mullard Tottenham, November 1955.
Here's a tube with a mistaken identity. These are marked 6SN7GT on the glass and are actually VT-231 from 1944. However, the base and the packaging show them as 6SL7GT or VT-229. They were accepted by the Navy as VT-229 tubes.
Detail:
Detail:
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AS far as I know, there are three versions of this RFT 6SN7, this is the earlier welded plate version with twin getter
Adrian … Do you own any electronic equipment to plug some of your collection in to 
These are some of my oldest 6SN7 VT-231. 1944 Sylvania still in original packaging and NOS - unused.
Yes, not only collecting, I listen to them as wellAdrian … Do you own any electronic equipment to plug some of your collection in to
Correction: code is f31 X8F. f31 is GZ34 with wider base. X8F is Philips Sittard (Netherlands) June 1958.
I can’t even imagine the quality & build of these 12AX7 tubes, I would love to find a pair of these for my HH Scott 272 amp!
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