a timtron turbo mod question

[NR5P]

Heres what ive done now.  I switched the wires on this better cartridge and it seems to have improved positive peaks a tad over 100%and not clipping on my negatives at this point like it was.  I played a couple audio sine waves over the speaker into the mic but like with a 1000hz wave my modulation current is at 125ma (manual says don't go above on positive peaks) before I get to 100%.  And I am a little confused on exactly how to use a scope when monitoring voice.  sine wave is easy to monitor but when speaking or holding a tone with my voice the left side of scope is showing 100%and the right is much lower modulation.  I gues this has something to do with the sweep of the scope.  If I'm holding a tone I thought it would be even. 

The element that is not working as well is NOS It was in a box not used I got it a while back...Maybe there was a reason the factory didn't use it...

I still have two this old one I'm using now and another that I repaired with a razor knife, glue, candle wax and a lot of patience. 

[WD5JKO]

I played a couple audio sine waves over the speaker into the mic but like with a 1000hz wave my modulation current is at 125ma (manual says don't go above on positive peaks) before I get to 100%.  

  Nathan,

   With a sine wave drive, the tone is continuous, so the average level is higher. Therefore the modulator current will be higher. I wouldn't worry about going over 125 ma, but maybe limit it to 30 seconds or so. Do worry about going over 100% negative though as that unloads the modulation transformer, and modulator for the time period the over modulation exists. This is where the Apache clipper might help out if it is still in the circuit. Otherwise you keep the level down, or just use some form of high level clipper, or negative cycle loading circuit.

I still have two this old one I'm using now and another that I repaired with a razor knife, glue, candle wax and a lot of patience.  

  I did the razor, and wax repair myself years ago. It worked! I made a post about it too, years ago on AMFONE..

Jim
WD5JKO
 

[NR5P]

I did a sine wave test 400hz 1000hz and 2000hz just downloaded test signals off of youtube.  Couldn't get the program to play for some reason.  exactly 100% mod on 1khz and 2khz and less of course at 400hz.  This would be a much more accurate way to now swap tubes and see which gives me a little advantage.  thanks for elmering me you all have been a big help.  Monitoring on the scope I seem to be getting the 120% without clipping if I talk normally...

[WD5JKO]

  Couldn't get the program to play for some reason. 

  Did you press the green triangle up by the '?', and uncheck the 'Mute' button?