[ARC5] Modified BC-454

[Brad Hernlem]

I hope that it is OK to enquire about mods on this list. I have a beater 
BC-454 that I am cleaning up and surveying for functionality. It has been 
through a lot of turmoil in its tortured life. Amongst other things (many) 
there appear to be changes to the bias of the 1st tube and the audio output 
tube. Specifically:

a) the cathode resistor of the first 12SK7 has been shunted with a 390 ohm 
resistor (original spec is a 680 ohm resistor). The shunting resistor looks 
of the same type as the rest of similar size on the rectangular terminal 
pads.

b) the cathode resistor of the 12A6 audio tube is changed to a power wire 
wound 400 ohm unit. Original small (1.5K?) resistor clipped from terminal 
pad.

c) the grid 1 resistor of the 12A6 is changed to 500 K from 2 Meg original 
spec.

Sounds like these were attempts to "improve" the output level of the 
receiver. Do these mods sound familiar? Mod a) almost looks "stock", as if 
it were a revision change by the manufacturer. The others are plainly done 
by someone else. Can anyone shed some light on these changes?

Brad
KG6IOE