Symetric line-out for A15MK2

EdwinSteenstra

Is it possible use replace the outputtrafo of the A15MK2 with the marshall 4001 outputtrafo?
http://www.tubeampdoctor.com/product_info.p…Nh4yMXXHfqPPt-0

Is it just adjusting the feedback resistor (4001 has only 8 ohm) or is there more to it?

Kind regards,
Edwin.

eBernd

Hi Edwin,

it is possible (the OT is for the same type of Tubes).
Why adjusting the feedback resistor? R47 is already (that means with the original OT) connected to the 8 Ohms winding.

Do you want to change the OT just to get a line out or do you expect another/better sound?
You can get a line out with an additional (and cheaper) line out transformer.
For both methods a speaker (or a "silent" resistive load) has to be connected and the line out needs "modeling" (at least equalisation) for a good sound.

keep on rockin...

groetjes, Bernd

EdwinSteenstra

Thnx, I could not remember from memory to which winding R47 was connected. A seperate line-out transformer is a good idea indeed (why didn't I think of that ;-). The main purpose is for use in the studio and bigger gigs where I'm using a slave amp. Currently I'm using just a voltage divider at the 8 ohm winding, which is ok, but asymmetrical.

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