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Thread: Fender Blues Deville power transformer

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    Arrow Fender Blues Deville power transformer

    I am building an amp using circuit boards and original output transformer from a 1994 Fender Blues Deville. I don't need a 60 watt amp. Can I use a power transformer from a Blues Deluxe to reduce wattage? Will it be compatible with the original Blues Deville output transformer or should I also buy a Blues Deluxe OT? Many thanks for your help.

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    The B+ isn't much different between the two, 427V vs 471V. The Blues Deville OT will tend to pull too much current. The Blues Deluxe OT is a much better match for the Blues Deluxe PT.

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    The Blues Deville OT will tend to pull too much current.
    I don't think so. The influence of OT size and efficiency on power supply current is insignificant.

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    Quote Originally Posted by Helmholtz View Post
    I don't think so. The influence of OT size and efficiency on power supply current is insignificant.
    I expect loudthud is considering a certain (incompatible?) tube relative the OT's load and the final affect on the whole circuit.?. I wasn't clear on it either but Mr. thud knows his stuff so I'm sure there's logic that wasn't made clear.

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    They both use a pair of 6L6GC... And does an OT "pull current," or do the power tubes do that?

    This was in response to Chuck's mention of different "(incompatible?)" power tubes.

    Justin

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    I admit I didn't look into it. I just grabbed at the first thing I could think of to make sense of things.

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    Maybe having to do with the primary Z of the OT?

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    Quote Originally Posted by g1 View Post
    Maybe having to do with the primary Z of the OT?
    The 2 OTs are used by Fender in essentially the same power circuit, the main difference being about 10% less HT voltage in the Blues Deluxe. I assume that both OTs have a primary Z of 4 k to 5k.
    Even if the primary Z would differ by say 20%, the current source character of pentodes/tetrodes wouldn't allow for much influence of load Z on (total supply) current. The Blues Deville OT may have 5% less losses and thus produce 5% more output but also this would not reflect in different supply current as the power input to both OTs would be the same.

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    Last edited by Helmholtz; 03-10-2019 at 12:16 AM.
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    Thumbs up Fender Blues Deville power transformer

    Quote Originally Posted by lexluthier2019 View Post
    I am building an amp using circuit boards and original output transformer from a 1994 Fender Blues Deville. I don't need a 60 watt amp. Can I use a power transformer from a Blues Deluxe to reduce wattage? Will it be compatible with the original Blues Deville output transformer or should I also buy a Blues Deluxe OT? Many thanks for your help.
    Many thanks to all for responding to my question and for your advice. I truly appreciate it. As the cost for a just a power transformer for a Blues Deville is similar to the cost for Blues Deluxe power and output transformers together I can now make a better decision as to what to order. This will be an interesting project.

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