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Thread: Pre-amp tube comparisons

  1. #1
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    Default Pre-amp tube comparisons

    Collector's item - Serious question!

    I thought I'd sussed-out the pre-amp tube field - 12AX7 (lots of gain and vol), 12AY7 (much less gain, roughly same vol), 12AT7 (half gain, half vol), etc, etc... But then I read about the EF86 (gain monster) tube and it's got me thinking; How many other types are available?

    Please let me know about your experiences with uncommon pre-amp tubes.

    Many thanks.
    It's not that I don't like people - I just prefer the alternatives...
    "You, Charly, are hahahaing brilliant!!" - Alders ...showing great judgement.

  2. #2
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    First thing you need Charly is to understand that they are 'Valves' not 'Toobs'.


    Steve has a brief guide to the most common ones



    http://www.stevesamps.co.uk/?page_id=281


    https://www.watfordvalves.com/pdfs/t...2ax7_ecc83.pdf

  3. #3
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    They're "tubes" every bit as much as they're "valves", John!

    Thanks for the links though. I'll follow them up...
    It's not that I don't like people - I just prefer the alternatives...
    "You, Charly, are hahahaing brilliant!!" - Alders ...showing great judgement.

  4. #4
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    Quote Originally Posted by Charly (Cheebatone) View Post


    They're "tubes" every bit as much as they're "valves", John!

    Thanks for the links though. I'll follow them up...
    Not for me. I am British and the colonials should respect and speak English not manufacture their own version of almost every word

  5. #5
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    There are dozens of tubes (valves) that fit the 12A*7 form factor. ECC99 is one of my current favorites. Some of them have a high gain stage and a low gain stage for RF applications. Try this for size . . .

    Duncan's Amp Tools

    Sorry if I just made your head explode, Charly.
    Last edited by redmax61; 09-02-2016 at 08:13 AM.

  6. #6
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    Charly

    there's a 4 page article on 'How preamp valves work' in this month's (October 2016) Guitar & Bass mag. Haven't read it yet but the writer Huw Price is usually quite good

  7. #7
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    Thank you Robin! (and John!)
    It's not that I don't like people - I just prefer the alternatives...
    "You, Charly, are hahahaing brilliant!!" - Alders ...showing great judgement.

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