ECC99 in a Bassman Micro

Discussion in 'Shock Brother's DIY Amps' started by Pierre67, Aug 12, 2019.

  1. Pierre67

    Pierre67 TDPRI Member

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    Hello !
    I would like to try a ECC99 in a Bassman Micro, do you think it will work ?
     
  2. radiocaster

    radiocaster Poster Extraordinaire

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    Yeah. check out the Tube Town kits, you can download the schematics. Many of them like the Hot Lukas, Wild 13 or Molly let you use an ECC99 or ECC82 in the output section, which is similar to the Bassman Micro. You need a different output transformer though.
     
  3. robrob

    robrob Poster Extraordinaire Ad Free Member

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    The Bassman Micro's recommended output transformer has many selectable impedances so it will work with an ECC99. You'll have to determine what load it needs then select the corresponding wires for the output transformer primary.
     
  4. Pierre67

    Pierre67 TDPRI Member

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    I'm aware of those kits, I think the only difference is they suggest that ECC99 needs 12,8 Kohm (pins 4-6 for 8 Ohm load) instead of the 22,5 Kohm needed for 12AU7 / 12BH7. I have a spare Hammond 125C but I think that the 125B will work as its rated for 5Watts.

    I was thinking that maybe I can wire the OT using pin 4 as common and switch between 2 and 6 for 12BH7 / ECC99.
    Will I need to change the cathode resistor?
    Thank you four your help !
    Pierre
     
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