[MRCA] WTB Mod. Transformer for TBW (Suppressor Grid Modulation)

[JOHNGRU at aol.com]

I need a suppressor grid modulation transformer for my TBW HF RF deck. The  
tube to be modulated is an 803. (The modulator was in the Power supply for the  
TBW).
 
? I have an extra mod. xformer for my GF-11 (Finals are 2 837s) which might  
work?? Does anyone know the +/- voltage range needed to fully modulate the  
803??
 
Thanks & 73  John Allen  W4GQT