HERE IS THE FINISHED PRODUCT.  SOME FINE TUNING TO DO, BUT IT IS FULLY OPERATIONAL

New Modulator Chassis READY FOR THE IRON

After a week of drilling holes and screwing screws and bolts here is how it looks now.  The space in the center front is where the speech amplifier chassis will be mounted.  I chose two 5VAC filament transformers so I can change tubes at will.  The transformers can be connected to give either 5 or 10VAC which means I can use many different tubes in the modulator.  (4-400, 4-250, 3-500Z, 813, 833A etc).   In the left front corner is the screen reactor, next to it is the filament and bias supply transformers for the speech amp.  Left rear is the modulation reactor, then the 5VAC filament transformers, tube and last but not least is the modulation transformer at the right rear.  That transformer is a lot bigger than it looks, it weigh about 75 lb.   There will be a heat shield installed between the tubes and the mod. transformer.  The tubes set right in front of the cabinet intake air fan and are raised above the chassis by 1 1/2 inch so the air cools both the tube and the sockets.   Just give me a little space and I'll find something to put in it!  Two more items will go in there somewhere, a board for neg. cycle loading and a board with the feedback ladders. ....Bill

Looks like the power section of the modulator is finished and is installed in the cabinet.  Now for the test phase.  The transformer setting in the space where the speech amplifier will be is a 500 Ohm to PP Grid driver that I will use for test purposes.  I'll build a speech amplifier when I decide on the final tube configuration.  At the present the tubes are to be triode connected and I can put anything in from 4-125 to 3-500Z's.  I might like Class AB1 better than triode but that remains to be seen.     I got the relays from Scott today and the tubes from Skip.  Everything is coming together.  Maybe you will hear it soon.......Bill

The Finished Modulation Deck A Pair of 813's driven by a Pair of 807's x 807's