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Toasted Resistor ID


John Paule
Posted on Thursday, August 18, 2005 - 02:14 pm:   

Just a quick Q...

have a MM 21065 (chassis #2275-65-ul) late 70's, i'm assuming- s/n bno8825
control pcb is a "GB-1b"

tried to make out the designations on your on-line schem (page 2 of 3) but it's not clear enought for me to read.

the 2 watt resistor across pins 1 & 8 on the bottom side of the OUTER power tube socket is unrecognizable..the first band is possibly "1" brown, the second, black "0", it seems- from there it's cracked. could be a 5% tolerance.

the other tube socket doesn't utilize this resistor--otherwise appears identical.

If this is original, do you know the value?

thank you for your time, this site seems to have great answers.

John Paule
Posted on Thursday, August 18, 2005 - 03:53 pm:   

btw- do you want a pic??

michael kaus
Posted on Friday, August 19, 2005 - 04:32 am:   

They were originally 10 ohm 1 watt resistors. You could put 2 watt in there without any harm. They kind of act as a fuse of sorts, that's why they only used 1 watt. Mike.
Posted on Saturday, December 24, 2005 - 10:05 pm:   

Hey Mike,
I have a 212-65 with original Sylanvia EL-34's. One blew the resistor. I changed the tubes out with winged C's and replaced the resistor with a 2 watt. Amps sounds better and the 2 watt works great.