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View Full Version : Any boogie techs? Mark 3 question.

trey85stang
10-30-2008, 12:38 AM
Anyone know what the resistors are in this pic circled in red? I had a new tube go bad (GT 6l6ge or GT EL34m :mad: ) and pulled the chassis to make sure nothing looked funny or burnt and those 4 resistors need to be replaced, but I dont think think they are what caused my problem.

Since I cant swap them for a few days, I figured I would try and find out what resistors they are :confused:

http://trey85stang.googlepages.com/DSC00069.jpg

I borrwed the picture.. thats not my amp, the resistor closest to the 3 caps is for sure burned up as it has a big burn mark on it.. the two carbon comp resistors are cracked.
SatelliteAmps
10-30-2008, 06:09 AM
The two middle ones are 100Ω (Brown = 1, Black = 0, Brown in the third line means add 1 zero to the end.) I can't tell the colors of the two outside ones very well. Looks like it might be orange white something, either brown or red. Orange = 3, White = 9, the multiplier is the one I can't see (and that makes a major difference.) Brown would add 1, red would add 2 zeroes (either a 390Ω or a 3.9KΩ). If it is a different color than that, it could be something else.
Rosewood
10-30-2008, 07:18 AM
How do you know they need replacing, are they burnt, opened, shorted? Visually they look ok unless my eyes are on the way out.
VikingAmps
10-30-2008, 07:29 AM
I have seen those go on Boogies when a power tube goes. They are filament balancing resistors. Your amp will probably hum if they go bad but otherwise work OK.
AR-305
10-30-2008, 11:30 AM
The blue ones are 39ohm and like the 100ohm filament load resistors they provide ground reference for the 6volt DC supplied to the filament of V1 and the Rythm 2 relay.
trey85stang
10-30-2008, 03:51 PM
How do you know they need replacing, are they burnt, opened, shorted? Visually they look ok unless my eyes are on the way out.


The picture is not of my amp, the two cabons are cracked, and the resistor on the right is burned. The one on the left looks ok, but if I am going to replace those three might as well replace that one too :D
trey85stang
10-30-2008, 03:52 PM
The blue ones are 39ohm and like the 100ohm filament load resistors they provide ground reference for the 6volt DC supplied to the filament of V1 and the Rythm 2 relay.


thanks for the info, that helps!