Three Mullard ECC83/12ax7's labeled "Fisher" and one ECC81/12at7 labeled "Daystrom" I have no way of testing them, but they all work and were all tested to be good when I bought them within the last year.
The Daystrom was matched for a phase inverter.
#1 & #3 have matching date codes.
All tubes have a "B" in the code which I believe means they are made in the Blackburn plant.
I think #1 & #3 are early 60's dates and # # 2 is earlier 60's date.
From left to right in pics.
#1: ECC83/12ax7- The Fisher; Fisher Radio Corporation New York
I63 B4J1
1022-502
Made in Great Britain
#2 same as #1 except 1022-425
I61 B3E2
#3 same as #1 except I63 B4J
#4
Daystrom ECC81/12AT7
A Product of Daystrom Industries
B2L1
Links to pics:
http://tinypic.com/9g8rvn.jpg
http://tinypic.com/9g8ryd.jpg
http://tinypic.com/9g8s45.jpg
http://tinypic.com/9g8s9x.jpg
http://tinypic.com/9g8scx.jpg
http://tinypic.com/9g8sht.jpg
$100 shipped and insured in the CONUS
The Daystrom was matched for a phase inverter.
#1 & #3 have matching date codes.
All tubes have a "B" in the code which I believe means they are made in the Blackburn plant.
I think #1 & #3 are early 60's dates and # # 2 is earlier 60's date.
From left to right in pics.
#1: ECC83/12ax7- The Fisher; Fisher Radio Corporation New York
I63 B4J1
1022-502
Made in Great Britain
#2 same as #1 except 1022-425
I61 B3E2
#3 same as #1 except I63 B4J
#4
Daystrom ECC81/12AT7
A Product of Daystrom Industries
B2L1
Links to pics:
http://tinypic.com/9g8rvn.jpg
http://tinypic.com/9g8ryd.jpg
http://tinypic.com/9g8s45.jpg
http://tinypic.com/9g8s9x.jpg
http://tinypic.com/9g8scx.jpg
http://tinypic.com/9g8sht.jpg
$100 shipped and insured in the CONUS
