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Registered Member #3989
Joined: Thu Jul 07 2011, 05:10PM
Location: In a van down by the river.
Posts: 52
I am trying to figure out if using a mot as a power transformer and another as an output transformer would work okay as a low frequency audio amplifier. I have never heard of anybody doing it but it seems like a neat way to build a high power bass rig. Any thoughts?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
It probably would work with the secondary as the tube plate load and the mains winding to the speaker. Try it and see. While experimenting,use a load bank of resistors on the primary (now secondary) to see voltage levels.
Mains transformers have been used to sub for output transformers and they do work.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
An MOT has a magnetic shunt which effectively adds a huge inductance in series with the winding, so if you do use an MOT as an output transformer remove the shunt. (for most MOT the shunt is just a stack of laminations that are easily removed)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
And if you use a MOT as the output transformer, put an air gap in its core. Note: The original mains winding will probably have a too high voltage output (and loading impedance), and might need rewinding.
Registered Member #3989
Joined: Thu Jul 07 2011, 05:10PM
Location: In a van down by the river.
Posts: 52
Thanks alot for the replies! Is there any reason to leave the shunt in the power transformer or should I remove it too? One of transformers shunts came out easily, the other is glued in better.
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bass guitar amplifier using mots and transmitting triode
