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6SN7 Tube Addicts

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  1. m17xr2b
    If British tubes say foreign on the glass they're rebrands. That one looks quite russian but could be american as well.
     
    L0rdGwyn likes this.
  2. L0rdGwyn
    Ah, makes sense, I guess that would explain the price. Plate structure is different than typical Brimar's as well, I'm just not very familiar with them. Thanks!
     
  3. L0rdGwyn
    New tube today, Raytheon rebranded Tung Sol 6SN7GT round plate, looks unused. Side by side internals with another BGRP I have, most importantly, the yellow print matches my 421A :wink:

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    whirlwind, Velozity, Skylab and 2 others like this.
  4. Velozity


    Nice. That tube us on my shortlist also.
     
  5. Velozity
    Can you guys help me figure out a couple of tubes I recently acquired?

    First is a Bendix 6SN7GT. It has an oval top mica with "mouse ear" spacers, gray T-plates with copper posts, and a bottom "D"-getter. I assume this is made by Tung-Sol? Any idea of the year? Is it the 332nd day of 1952?
    [​IMG]

    [​IMG]

    Second is a Sylvania with green label that was sold to me as a 6SN7GT, but I suspect may actually be a 6SN7W. The date is 39th week of 1952. Odd thing is it has round plates and a spiked top mica. The getter is hard to see but looks like foil. I tried to capture it in the last photo. Did Tung-Sol make this for Sylvania? I haven't heard of a RP from anyone but TS before, but alas I'm new to the tube hobby. All help is appreciated!

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    Last edited: Apr 29, 2019
  6. Ripper2860
    The Bendix is a Tung-sol mouse ears. By all accounts, it is a good sounding tube. If I had to guess on a date (249), it would be 49th week of 1952. The 322 is the Tung-sol manufacturer's code.

    The Sylvania looks completely unfamiliar and I'm pretty up-to-speed on Sylvie 6SN7s and 7N7s. Are you sure that's a 6SN7? Could be a 6N7S which is NOT the same. I'd make double-triple sure before sticking it in an amp designed for 6SN7!
     
    Last edited: Apr 29, 2019
    Velozity likes this.
  7. L0rdGwyn
    Yup, first is definitely a Tung Sol mouse ears, construction is identical to one I have on hand. 322 is the Tung Sol manufacturer code, the final three digits may be indicative of the year and week, but I'm not familiar with how Tung Sol coded that information. My best guess, 249 may be 49th week of 1952.

    Definitely a cool looking rebrand!

    Is there an echo in here? Like @Ripper2860 said, I have never seen a Sylvania 6SN7 with that plate structure, be careful!
     
    Last edited: Apr 29, 2019
    Velozity likes this.
  8. Velozity
    The eBay ad said 6SN7. I think maybe it's a 6SL7 though. Here's a Google image:

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    Ripper2860 likes this.
  9. Ripper2860
    Yep -- that looks like it. Seems it was improperly listed. Perhaps a refund of some type is in order.
     
  10. Velozity
    Here's a couple more tubes I received today. They were part of an estate lot. I cleaned them up and they look brand new. Came with original boxes with wadded newspaper inside from 30 years ago. I don't think they've been touched since then.

    Raytheon 6SN7GT: Bottom foil getter, black T-plates. 26th week of 1953? Is it identical to a VT-231?

    [​IMG]
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    Sylvania 6SN7GTB: Top getter, black triangular plates. Says "C7B" on the dome. What year is this from? Also has code "DH" on the base.

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  11. Wes S
    That Raytheon, looks a lot like a Sylvania "Bad Boy".
     
    Velozity and L0rdGwyn like this.
  12. Velozity

    I was thinking that too (excitedly). But I wasn't sure if Sylvania rebranded them.
     
  13. m17xr2b
    280 is the Raytheon code. Sylvania has 312. Even if they rebranded the manufacturer code remained the same.
     
  14. gibosi
    If the code was etched in the glass, this would be true. However, in this case Raytheon procured that tube from Sylvania, put a base on it with their name and code, and sold it.
     
    Wes S and Velozity like this.
  15. Velozity

    Well that's encouraging. Looks like a nice gem I found then.
     
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