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5F6A issues


 
7/11/2005 11:34 PM
Darcy
email
5F6A issues
Hello,  
I'm building a Tweed Bassman right now and for some reason, when I turn the amp on, the 1W 4700 K resister attached to the positive ends of the power filter caps is smoking. What could cause this? Also, I am getting no sound. Please help.  
Thanks,  
Darcy
 
7/12/2005 12:20 AM
Bruce /Mission Amps
email

quote:
"the 1W 4700 K resister attached to the positive ends of the power filter caps"
4700K ohms... ha ha no such thing in that amp.  
If you mean the 4700 ohm resistor, NOT 4,700,000 ohms, then you have a dead short to ground, right after that one resistor or a filter cap(s), that is wired backwards with respect to ground.  
All kidding aside, if you don't know why a 4700 ohm resistor would smoke in this way, I'd say you are over your head with amp project like this.  
Start over in the B+ rail and check your work again before applying power.  
 
Bruce
 
7/13/2005 11:28 AM
Darcy
email

Bruce,  
Sorry about the type-o. Clearly I meant the 4.7K resister. I am sufficiently humbled. I've checked my work and there were a couple of mistakes. Thanks. One question - I have a choke rated for 5-8H @ 200ma. Is it better for me to have one rated at 9H @ 120ma? Would this make a big difference?  
Thanks,  
Darcy
 
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