[Boatanchors] Parasitic Chokes

[Lee]

I just purchased a HT-46 transmitter and a SX-146 receiver I plan to 
totally restore.  Today I checked all the tubes and made a preliminary 
assessment of what all has to be done.  In the process I looked at the 
39 ohm 2 watt carbon resistor located within the final plate cap's 
parasitic choke.  It could stand being replaced as it has gotten pretty 
hot in the past based on it's color.

I have replaced these resistors in the past with Ohmite OY resistors as 
folklore has suggested.  That got me thinking.  Maybe this is all BS and 
new style carbon film, metal oxide and metal film resistors could be 
used which is contrary to folklore.  I've read the spiral cuts in these 
new resistors is non existent or of very few turns when the resistor is 
of low resistance.  39 ohms is certainly low. So maybe this OY 
suggestion is like the myth you can't use 6146B tubes in 6146 circuits.  
(I have used 6146 tubes extensively in replacing 6146 tubes with no 
problem.  Don't go into S-line neutralization caps.  The up grade was 
done because the initial caps were under rated in the first place.)

So I have decided to do an experiment when I rebuild the HT-46.  I am 
going to make new parasitic chokes using all 4 type resistors and see if 
any make any difference in the transmitters performance.  I am 
suspecting there will be no difference in transmitter performance from 
one type to the next.  I'll also measure the inductance on all these 
resistors.  I suspect the inductance will be so low my meter will barely 
detect any inductance or not detect any at all.  Proof will be in the 
pudding.  I'm going to see what happens in the real world.
Lee, w0vt