[Boatanchors] Smart People: 70-Volt Line to Voice Coil Transformer-

[David Stinson]

Dear Smarter-Than-Me People:
Is there anyone in our community who is expert with 70-Volt-Line 
distributed audio?
I ask because I have an application for a larger-than-normal 
Line-to-Voice Coil transformer.
It is easily twice the size and of more robust construction than the 
ones you commonly see.  It has no maker markings.  Line-side has four 
line selections (unmarked).  Highest DC resistance is 117 Ohms.  
Voice-coil side has three (unmarked) selections, which are likely 4-8-16 
Ohms.   Please see the attached photo.

My question:  The transformer is part of a cathode-modulation test.  Can 
this transformer survive 200 mA current for as much as 5 mins, assuming 
a duty-cycle of 25% or less?  That would mean the windings would have to 
dissipate about 5 Watts as heat during on-cycle.  That don't sound like 
much but it is, especially when dumped into a heat-retaining iron core.  
I'm doubtful but don't know the capabilities of this transformer.  Any 
insights would be appreciated.

TNX OM ES 73 DE Dave AB5S




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