what sort of noises are we talking about here?Quote:
Originally Posted by PaCrappa
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what sort of noises are we talking about here?Quote:
Originally Posted by PaCrappa
Bill just called and said the amp's fixed. Something about the power transformer and the speaker connection... No charge. Will report later.
No charge is good news.
Hiss and hum. For whatever reason it isn't so bad at the moment. And being that it's a stock '71 I'll probably just leave it as is.Quote:
Originally Posted by buttcheeks
BUT, if I did want to try to fix the issue, where would you suggest I start? I'm obviously no technical wizard but I can read resistor stripes and work a multimeter okay.
The problem with old Muffs is that they used so many differing values in the resistors and capacitors that no one's really sure what's in most of them.
PV TAKES NAMES.
This thing is the best rock and roll tone I've ever played. With higher output pickups it could even be a metal monster.
Excitement.
Since you say that it gets better and worse, I'm gonna take an educated guess and say that you have either A) a lose connection or B) grounding problems.Quote:
Originally Posted by PaCrappa
Both of which can be caused by old solder joints that have become brittle over time.
There are two "opinions" on how to fix this. The lazy way is to go through and reheat each solder joint. Another, and more tedious way, is to go back, heat the solder joint, suck the old solder off and then later apply new solder.
One thing to note: the transistors in your effect are probably germanium. Those are very sensitive to heat. You will want to leave those for last. And you will want to heat one leg at a time, and give the transistor time to cool off before moving on. If the transistor has long legs you might even want to put an alligator clip or hemostat on the leg above the solder joint as to bleed heat away from the head of the transistor.
Personally, I'd redo everything but the transistors first, test it to see if the problem goes away, then do one leg, test, another leg, test, etc.
BTW, this method also works for getting rid of some hum and hiss problems in old amplifiers.
A typical flow chart of easy fixes for old gear is:
1) put a three prong chord on it (if its an amp)
2) reheat the solder joints
3) clean the pots
4) retube it
5) look for burnt parts
6) get the filter caps replaced
7) replace all the caps
I may be forgetting something, but any trouble shooting past that will probably require a signal generator and an oscilloscope. OH, and if you are lucky, you have the schematic. And if you are extra lucky you know the plate voltages.
DISCLAIMER: DON"T GO INSIDE TUBE AMPS. DEATH LIVES THERE. THAT'S WHY THEY ROCK. HE WILL KILL YOU.
Thanks. It's buttass old and I may just go through and give it the tedious treatment.
This is awesome.Quote:
Originally Posted by buttcheeks
A Deluxe reverb will throw a man across a room if not treated correctly.
So I finally aby'd the Kustom Charger and Peavey 50 and I was floored. Played an open power chord and literally said "Holy shit" under my breath. The tone is thick as molasses with phenomenal clarity across the whole spectrum. I think I've found the best amp set up I've ever played. One guitar amp and one bass amp Y'd together. Try it if you have the gear.
I think I'm gonna sell my acoustic 4x10 and 2x15 and go for an old ampeg vt-22 sort of thing.