[AMRadio] T3 Mod iron specs - Audio limitations, harmonics, etc.

Ed Sieb esieb at sympatico.ca
Thu Feb 21 01:47:43 EST 2008


T-368 Modifications by The TimTron, Tim Smith, WA1HLR

Contains detailed specs on the speech amp,  modulators and improvement mods
for this rig.

"With the stock iron, there was a noticeable improvement in the low end
response. Further improvement can only be obtained by installing a different
modulation transformer. Space is limited. However, there is one type that
appears to be made to order, the famous RCA 5500-to 5500 Ohm (1:1 ratio)
open frame broadcast type. There is JUST enough space to install it.
However, two electrolytic caps (C17, C18) that were part of the carbonium
microphonuim voltage circuit must be removed. R19 is also jumpered out of
the circuit. The new mod transformer will drop right on the chassis like it
was meant to be. "

Case closed.


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