ajbergren
Member
- Messages
- 187
[FONT=Verdana, Arial]Today, I was lucky to obtain (free of charge, although I offered to pay!) several NOS tubes.
2 x GE 12AX7A: Labeled Marconi Radiotron, with a vertical PB. Also labeled 12AX7A/7025/Made in Canada
2 x GE 5751: 5751/USA, Five stars also has MT/RT 188-5 on the tube and 165-0548 on the box.
2 x Sylvania 12AT7: Made in Poland
1 x Sylvania 12AT7: Made in USA, ge ACZ labels, also has 12AY7/ECC81/USA in small gray letters.
1 x Sylvania 12AX7A: One made in USA, has red letters that read Be?????, the other is labeled 7025A/12AX7A/Canada, and says Sylvania with the electron bolt symbol and Made in Canada, big vertical PT, and small horizontal DJC
1 x National 12AX7A: Made in USSR, labeled Sovtek
1 x RCA 5Y3: RCA, made in USA, not other significant markings
Okay, here are my questions:
Are these any good? I know the GE 5751's are awesome, but what are the Marconi 12AX7's (GE labels)?
Also, how about those Polish 12AT7s?
Basically, I have two main amplifiers that I would consider using these in:
a 1965 Princeton Reverb
a Victoria Tweed Deluxe Clone
I also have a 1979 Champ and an Orange Tiny Terror.
Would any of those 12AT7s be useful for the reverb driver in the PR? I think the USA sylvania might be useful, but I do know the JAN Philips are not good for this position, as they do not handle the heat (they go bad quickly).
How about the 12AX7's? are the Marconi's any good? How about the Sylvania's?
Any help identifying the origins of these tubes (i.e., original manufacturers', or other info) would be awesome!
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2 x GE 12AX7A: Labeled Marconi Radiotron, with a vertical PB. Also labeled 12AX7A/7025/Made in Canada
2 x GE 5751: 5751/USA, Five stars also has MT/RT 188-5 on the tube and 165-0548 on the box.
2 x Sylvania 12AT7: Made in Poland
1 x Sylvania 12AT7: Made in USA, ge ACZ labels, also has 12AY7/ECC81/USA in small gray letters.
1 x Sylvania 12AX7A: One made in USA, has red letters that read Be?????, the other is labeled 7025A/12AX7A/Canada, and says Sylvania with the electron bolt symbol and Made in Canada, big vertical PT, and small horizontal DJC
1 x National 12AX7A: Made in USSR, labeled Sovtek
1 x RCA 5Y3: RCA, made in USA, not other significant markings
Okay, here are my questions:
Are these any good? I know the GE 5751's are awesome, but what are the Marconi 12AX7's (GE labels)?
Also, how about those Polish 12AT7s?
Basically, I have two main amplifiers that I would consider using these in:
a 1965 Princeton Reverb
a Victoria Tweed Deluxe Clone
I also have a 1979 Champ and an Orange Tiny Terror.
Would any of those 12AT7s be useful for the reverb driver in the PR? I think the USA sylvania might be useful, but I do know the JAN Philips are not good for this position, as they do not handle the heat (they go bad quickly).
How about the 12AX7's? are the Marconi's any good? How about the Sylvania's?
Any help identifying the origins of these tubes (i.e., original manufacturers', or other info) would be awesome!








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