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Is the twin reverb backface 80s all by hand wired?

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  • Justin Thomas
    replied
    Originally posted by chunli1900 View Post
    https://reverb.com/hk/item/31056950-...stion-speakers

    i have found a silverface with good price. its 1968 having the same circuit as blackface (AB763), anybody knows the difference ?
    I can't guarantee it's the same exact circuit as a blackface, and I can't tell you whether the price is a good deal or not, but that IS a mighty fine Twin Reverb you've found there. Can you ask the seller for some inside-the-chassis shots? Specifically around the power tubes. We can ID the circuit in seconds if so.

    Fender tube charts are notorious for being "behind the curve," because if they had a few hundred labels left over from the last circuit, they'd use the old ones before making new ones. Usually they would chuck new parts in with old & for a while it'd be a mish-mash of cosmetics & circuit guts. That's why I never trust a Fender tube chart or even serial number.

    Justin

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  • Justin Thomas
    replied
    Also, I'm pretty sure that should be AC568, not AB568. In case anyone go looking further.

    Justin

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  • Justin Thomas
    replied
    I think a lower-voltage Twin Reverb could possibly be killer! I mean, maybe it was a shock way back when but now? Maybe it'll be just a bit browner & is that necessarily a bad thing?

    Justin

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  • Justin Thomas
    replied
    Depends on when in 68. The "notorious" "horrible" "dreadful" "awful" "mixed-bias" system debuted in the AC568 series in most amps. Where they had 150Ω cathode resistors on the power tubes along with a slightly lower (higher) negative grid voltage than normal.

    Spotty era indeed, and no tube chart is to be trusted. Open it up, it's the only way to know for sure.

    Of course, I personally have heard more dog BF Fenders than SF, and I also don't see why everything needs to be bought for immediate blackfacing before it ever gets heard...

    Justin

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  • pdf64
    replied
    The ab568 has a few changes https://el34world.com/charts/Schemat...verb_ab568.pdf
    The PT looks to put out the same voltages as the ab763 so it should be simple to revert.

    Whereas the voltages in the aa769 look to have dropped a fair bit https://el34world.com/charts/Schemat...a769_schem.pdf
    Which may not be a bad thing!

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  • chunli1900
    replied
    Originally posted by Chuck H View Post
    This is a spotty era for me, but IIRC there weren't any circuit differences from the BF models in '68. I think there was a cabinet dimension change though. I'll be corrected if I'm wrong though.
    so I think the sound is very near to Blackface ?
    I hope I could try all those in real but itís impossible in my country 😔

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  • Chuck H
    replied
    This is a spotty era for me, but IIRC there weren't any circuit differences from the BF models in '68. I think there was a cabinet dimension change though. I'll be corrected if I'm wrong though.

    Leave a comment:


  • chunli1900
    replied
    https://reverb.com/hk/item/31056950-...stion-speakers

    i have found a silverface with good price. its 1968 having the same circuit as blackface (AB763), anybody knows the difference ?

    Leave a comment:


  • The Dude
    replied
    Recipe for disaster:

    1) Amp that amplifies primarily in the upper midrange - check.
    2) Heavy efficient speakers with aluminum dust caps - check.
    3) Speakers butted right next to each other for maximum mid-range coupling - check.

    Leave a comment:


  • Helmholtz
    replied
    Originally posted by pdf64 View Post
    IME, with modern tubes, the 135W models are lucky to put out 100W, and with the basic, original (somewhat inefficient ) speakers, they don’t seem super loud.
    The hardwired bright cap on the master vol isn’t helpful in getting a good sound. So I can well imagine the tone with JBLs being ‘piercing’
    Believe me, those JBLs were super efficient (101dB/W to 103dB/W depending on magnet type). And their aluminum dustcaps further increased on-axis pierciness.
    Last edited by Helmholtz; 04-17-2020, 11:59 PM.

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  • The Dude
    replied
    Then,...... imagine the weight.

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  • pdf64
    replied
    IME, with modern tubes, the 135W models are lucky to put out 100W, and with the basic, original (somewhat inefficient ) speakers, they donít seem super loud.
    The hardwired bright cap on the master vol isnít helpful in getting a good sound. So I can well imagine the tone with JBLs being Ďpiercingí

    Leave a comment:


  • The Dude
    replied
    Agreed. IMO, "SF (135W, UL, JBLs) twin" amps sound horrible. They'd probably work well to amplify a warning siren, but that's about it.
    Last edited by The Dude; 04-17-2020, 11:26 PM.

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  • Helmholtz
    replied
    I love most classic Fender amps, but I always hated it when I was forced to use a SF (135W, UL, JBLs) twin. Probably the stiffest and most piercing amp I know. But that's not related to point-to-point wiring.
    Last edited by Helmholtz; 04-17-2020, 10:41 PM.

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  • g1
    replied
    Originally posted by chunli1900 View Post
    Thx guys again.
    So Silver twins vs 80-81 twins, which you guys prefer ?
    68 to 82 are all considered 'silver face' design even though they made the 80-82 front panels black. It makes things confusing for sure.
    'blackface' refers to the series before the silver face. Most people prefer the old black face design, but there are people that like the silver-faces more. The real 'blackface' amps are always worth more than equivalent silver-face.

    Leave a comment:

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