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5e3 screen resistor placement

Discussion in 'Shock Brother's DIY Amps' started by mgrossm, Oct 27, 2020.

  1. Oct 27, 2020 #1
    mgrossm

    mgrossm TDPRI Member

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    for adding 470ohm screen resistors...add between pins 1 and 4 on ptube sockets?

    Also, while this has probably been rehashed a million times...thoughts on these plans to change first three coupling caps to 0.022, leave PI couplers at 0.1, make 1st filter cap 30uf and second 2 caps 20 uf. And of course want to add screen resistors.
    First 5e3. Have built a 5f8a and 5f6a but somehow this feels more intimidating, probably because its a citcuit and amp im not familiar with.
     
  2. Oct 27, 2020 #2
    ThermionicScott

    ThermionicScott Poster Extraordinaire

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    I recommend building it bone-stock first, so you can get a feel for how a real one sounds and responds. Then consider mods based on what you want to change.
     
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  3. Oct 27, 2020 #3
    mabinogeon

    mabinogeon Tele-Meister Silver Supporter

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    Pin 1 is unused on a glass bottle 6V6, but it is used on the really old metal shell 6V6 to ground the shell. So if you ever want to use a metal shell 6V6, don't use pin 1 for the screen resistors.

    You can use an insulated terminal standoff post like these to attach the other end of the screen resistor if you want (use it on one of the tube sockets mounting screws). Or just use pin 1 and remember not to use metal shell tubes.
     
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  4. Oct 27, 2020 #4
    mgrossm

    mgrossm TDPRI Member

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    Might beusing old eby sockets with ground terminals coming off the side...can i use one of those instead of pin 1?
     
  5. Oct 27, 2020 #5
    mgrossm

    mgrossm TDPRI Member

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    but bone stock might be a good idea
     
  6. Oct 27, 2020 #6
    tubegeek

    tubegeek Friend of Leo's

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    Do you want to ground your screen resistors? Not likely....
     
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  7. Oct 27, 2020 #7
    ThermionicScott

    ThermionicScott Poster Extraordinaire

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    Gotta wonder how many dweebs are still planning for/around metal tubes these days, anyway... :twisted:

    IMG_4891.JPG
     
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  8. Oct 27, 2020 #8
    Nickfl

    Nickfl Friend of Leo's

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    Build it stock and go from there on time mods, but I don't consider small value screen resistors to take be a tone mod, so I'd go ahead and do those. Rectifier backup diodes are a good idea too.
     
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  9. Oct 27, 2020 #9
    mgrossm

    mgrossm TDPRI Member

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    thank you
     
  10. Oct 28, 2020 #10
    mgrossm

    mgrossm TDPRI Member

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    Would placing rectifier backup diodes srill allow me to use a ss rectifier if i wanted to try one?
     
  11. Oct 28, 2020 #11
    ThermionicScott

    ThermionicScott Poster Extraordinaire

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    I don't know all the options out there, but you could still plug in one of these: https://tedweber.com/ws1/
     
  12. Oct 29, 2020 #12
    Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    I generally follow the other Fender offerings. Most of them use pin 4 and 6 for the screen resistor. Pins 1 and 5 for a grid stopper. The metal can 6V6 could be an issue if you were to decide to go that *heavy metal* route.
     
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  13. Oct 29, 2020 #13
    tele_savales

    tele_savales Tele-Holic Platinum Supporter

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    You could do this, as Rob shows on his site. Totally worth doing if you're putting backup diodes in. Dual Rectification Switch Diagram.PNG Dual Rectification Switch.PNG
     
  14. Nov 3, 2020 #14
    mgrossm

    mgrossm TDPRI Member

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    if i have the rectifier diodes in place would i have to install a switch to go between ss and tube rectifiers?
     
  15. Nov 3, 2020 #15
    mgrossm

    mgrossm TDPRI Member

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    the backup diodes in place i mean
     
  16. Nov 3, 2020 #16
    Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    For the switched diagram above, the backup diodes are always in service. The switch allows a choice between using the diodes of the tube vs the other two diodes.

    If you just want backup diodes for the tube rectifier only, just use the two diodes that are depicted on the rectifier socket pins 3 to 4, and pins 5 to 6. No switch.
     
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