What to keep on hand

Discussion in 'Shock Brother's DIY Amps' started by JuneauMike, Jun 17, 2019.

  1. JuneauMike

    JuneauMike Friend of Leo's

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    I tried asking this question once in this forum and did not really get a satisfactory answer, but its a question that is on my mind whenever I'm working on a project. What to keep on hand?

    Resistors, 1 watt:
    100ohm
    470ohm
    820ohm
    33k
    56k
    75k
    1k
    1.5k
    2.2k
    4.7k
    7.5k
    47k
    100k
    220k
    1M
    3M

    Carbon Comp, 1 watt
    100k
    82k
    33k
    47k
    56k

    1%
    1ohm

    2watt
    2.2k
    4.7k
    10k
    22k
    470k

    This is the stuff that I often wish I had more of. To say nothing of caps and other miscellaneous, such as shielded cable, etc. Anyone got anything else to add? I'm sorta trying to create a list of items that I can consult before I order anything from a supplier (shipping is a pain for me and the waiting for a part you really need in a pinch is worse). Probably not a wrong answer here.
     
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  2. Nickfl

    Nickfl Tele-Afflicted

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    1n4007 diodes, it seems like I order 10 of them any time I get anything, but I frequently end up being short by one when I need some.
     
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  3. Diverted

    Diverted Tele-Meister

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    Heat shrink tubing, 1/8”
    Terminal strips
    Grounding tabs
    4-40 screws and Keps nuts
    Shielded coax, solid core 18 and 20-22g wire, and stranded wire too
    Thermistors
    All kinds of other stuff too. Dental picks are super handy, chopsticks, alligator test leads, plenty of straight and bent needle noses, good solder suckers, nice brass soldering iron tip cleaners, wire brushes, deoxit, multimeters etc etc etc.
     
  4. kbold

    kbold Tele-Meister Silver Supporter

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    Perhaps think of stocking only one resistor type, 1/4 watt or 1/2 watt. Most resistors in circuits are 1/4 watt, except for power stages.
    Many resistor values can be created by using 2 resistors in parallel or in series. This then reduces the stock of resistor values you need to stock. Secondly two of the same resistors in parallel or series doubles the wattage capability.

    These are important things to ponder.
    And, as Diverted said, heat shrink tubing. (I would get several diameters.)

    Other parts - depends on what you think you will be working on.
    If you're working on guitars, cloth covered wire (several different colours), some 250K and 500K audio taper pots.
    As well as 1N4007 diodes, also some small signal diodes e.g. 1N914
     
    Last edited: Jun 17, 2019
  5. Snfoilhat

    Snfoilhat Tele-Afflicted

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    I always want more capacitors. 500+VDC. Like the yellow unbranded copies of Mallory 150s. Or, uh, Mallory 150s.

    50 pF
    100 pF
    250 pF
    1 nF
    2 nF
    5 nF
    10 nF
    20 nF
    50 nF
    100 nF
    680 nF

    You can almost always change these values without breaking an amp or introducing some instability or whatever, and it seems like a really under-utilized tone modification. New speakers and new pickups are fun, but let me try a different capacitor first, please. ¢¢¢:p

    I have a deep and abiding love of can-shaped multi-electrolytics like these JJs and the clamps that go with them, to neatly get most of the filter caps out of the chassis space.
    https://www.tubesandmore.com/products/capacitor-jj-electronics-500v-5050-f-electrolytic
    https://www.tubesandmore.com/products/capacitor-jj-electronics-500v-40202020-f-electrolytic
     
  6. JuneauMike

    JuneauMike Friend of Leo's

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    Some 1N5347s for voltage dropping too.
     
  7. JuneauMike

    JuneauMike Friend of Leo's

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    Yeah, but heat shrink you can get from any hardware store. I'm thinking about things I've gorta wait a week for when I need it. Probably a lot of you guys have an electronics store nearby.
     
  8. gusfinley

    gusfinley Tele-Holic

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    100 ohm 1% resistors for "hum-bucking" filiment windings. I like to use 2W resistors, but some use lesser.
     
  9. kbold

    kbold Tele-Meister Silver Supporter

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    OK. Well ....resistors as already said. You can apply the same idea to capacitors (i.e. 2 of the same caps in parallel doubles the capacitance, in series halves).
    UF4007's instead of 1N4007's (same voltage capability, but faster switching).
    A range of hookup wire and cloth wire.
    Solder sucker and solder wick.
    I'm assuming you have a soldering iron and multimeter.

    With your list including 1R 1% resistor, don't forget a pair of pants with a back pocket - to put your spare hand when working with tube amp voltages.
    This is very important.
    But of course, you can buy these locally as well.
     
  10. JuneauMike

    JuneauMike Friend of Leo's

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    Ha, well, not the 1% resistors. As far as pants, we've got Carharts and that's about it. But they have lots of pockets. :lol:
     
  11. kbold

    kbold Tele-Meister Silver Supporter

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    Saturday nights must be real hoot, with everyone showing up in Carhartts bib-and-brace denims.
    Gotta put Alaska on my bucket list.
     
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  12. Diverted

    Diverted Tele-Meister

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    Nope. There’s one an hour from here but they are crazy expensive. Mouser.l is your friend!
     
  13. BobSmith

    BobSmith TDPRI Member

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    Anyone know a good place to pick up AB NOS Carbon comp resistors? The 1meg and 100k stocks in particular have vanished into thin air. Now worth their weight in gold it seems. Crazy! Don’t they know we need them to build amps?
     
  14. BryMelvin

    BryMelvin Tele-Afflicted

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    also doubles the tolerance error.
     
  15. kbold

    kbold Tele-Meister Silver Supporter

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    No it doesn't.

    Example: 10R with +/-10% error.
    Two 10R in series = 20R ......... +/- 10% of 20R = 2R
    Lets say both resistors are at maximum tolerance i.e both resistors = 11R
    11R + 11R = 22R, so tolerance is still +/- 10%

    Also, it is very unlikely you would pick two resistors at max tolerance. More likely the tolerances may even out to actually give a tighter tolerance.
     
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  16. Sparky2

    Sparky2 Friend of Leo's

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    What to keep on hand?

    Too easy.

    :)

    download.jpg
     
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  17. kbold

    kbold Tele-Meister Silver Supporter

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    I guess that's one way to keep one hand out of the high voltage circuitry.
     
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  18. Southboundsuarez

    Southboundsuarez TDPRI Member

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    Surprised that nobody mentioned fuses? Maybe its just me? Always have slowblow fuses 500mA , 1A and 3A
     
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  19. kbold

    kbold Tele-Meister Silver Supporter

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    Blind to the obvious.
     
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