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In Reply to: Fender Blues Deluxe posted by sgtstabbin on March 17, 2009 at 09:22:09:
First, do you feel comfortable working with electronics? Soldering? High voltage? If not, you may want to consider a good amp tech. If ok...Some suggestions:
1.) First try contact cleaner on all sockets, plugs, tube pins. It could just be a poor contact. Let's hope so. If not...
2.) Take the amp outta the cab. Look carefully for burnt or damaged components. Check the solder points. Remove the cover over the filter caps. Look for damaged, mis-shapened, blistered caps. If they are shot, you'll need to do a re-cap job. Drain the stored voltage with amp turned off and disconnected. Recap with same mfd/voltage rating electrolytic caps. WATCH POLARITY! Ramp up with Variac.
3.) If electrolytic caps look ok, but you have a burnt coupling cap or resistor--you'll need not only to replace it (them), but to figure out why the component(s) got damaged in the first place. Prolly best to post your observations or take it to someone who can diagnose the damage. I would not simply replace a damaged component and hope for the best.
4.) If there appears to be no obvious damage, try to isolate the problem section. Try removing the phase inverter tube first. Keep all the other tubes in the unit. If the noise persists when you turn the amp on (amps is back in cab, speaker connected), then you know the problem is in the power section. Power tube, speaker, or OPT could have gone bad. Check all connections with the OPT carefully. Try subbing power tubes first (one-by-one). See if noise goes away and unit plays (PI back in its socket).
5.) If noise disappears when PI is pulled. Could be a gain stage tube. Put the PI back into its socket and try pulling each gain stage/reverb/tremolo tube one at a time and see if noise goes away. If it does with one tube, try subbing another similar type tube in that socket. Try subbing out the rectifier, if it's a tube type. Hopefully, it's just one bad tube.6.) If subbing tubes doesn't find the culprit, try the old chopsticks trick. Take a WOODEN chopstick. Sharpen the tip. Take the amp out of the cab. Connect the speaker. Now, you'll need to turn the amp on with the guts exposed. If you are uncomfortable with this scenario, seek a tech. If you are comfortable, try probing all connections, ground points, caps, resistors, socket connections, etc with the chopstick and see if you can generate a static or interuption of the offending noise with ONE of the points tested. You may have a bad cap, resistor, or solder point.
After all that and you still haven't found the problem. Repost. Good luck!
Edits: 03/22/09 03/22/09 03/22/09 03/22/09 03/22/09
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- RE: Fender Blues Deluxe - FenderLover 06:17:18 03/22/09 (0)
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