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Princeton Reverb Impedence

Discussion in 'Amps and Cabs' started by LARRY GERSHON, Jan 18, 2008.

  1. LARRY GERSHON

    LARRY GERSHON Silver Supporting Member

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    If I Run A Blackface Princeton Reverb With 6l6 Tubes Should I Change The Speaker From An 8 Ohm Speaker To A 4 Ohm And Can I Still Use The Extension Speaker Jack To Run A Another Cabinet And What Cab Ohmage Should I Use.
     
  2. Blue Strat

    Blue Strat Member

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    First, you shouldn't even be running a vintage blackface PR with 6L6s. You're endangering the power transformer and possibly the output transformer.

    Second, the impedance issue is moot based on my first comment.
     
  3. LARRY GERSHON

    LARRY GERSHON Silver Supporting Member

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    I Have Seen Lots Of People Run 6l6 Tubes In Deluxes? Is There That Much Difference?
     
  4. Blue Strat

    Blue Strat Member

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    Yes, the transformers are a LOT different.

    Risking a $2000(?) classic amp is not worth it.
     
  5. LARRY GERSHON

    LARRY GERSHON Silver Supporting Member

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    Thanks For The Info, I Really Had No Idea That Was A No No.
     
  6. pula58

    pula58 Silver Supporting Member

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    I think the power transformer in the PR will die from having to supply the larger 6L6 grid currents, or it is the heater currents? Someone correct me here please!
     
  7. Steve Dallas

    Steve Dallas Member

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    Both currents.

    The PR transformers are very small. Like Tweed Deluxe small. They do not supply enough current for either the high voltage or filaments. 6V6 tubes draw 0.45mA each for current. 6L6s draw double that at 0.9mA. You will be able to fry an egg on your power transformer if you try to draw that much current from it! That alone is reason not to do it.

    On the HV tap, the PR PT supplies about 80mA. 6L6 tend to draw 50mA each at PR voltages, so no go there either.

    A good compromise is to use JJ 6V6s, which sound similar to 6L6s and seem a little louder than their brethren.

    You also might think about a more efficient speaker.
     

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