My friend gave me this oak Legend Amp (Series II A 30),from Legend in Syracuse.It has 2 12AX7`s for pre-amp stage and ICs in the rest.It blows fuses so he gave it to me.
I have unhooked some of the sections so I could just test the tubes and I get the 6 volts at pins 4 and 5.The tubes glow ,no blown fuse.
It has four ICs in it They are the famous 4558`s that I believe are in old tube screamers. Do these go bad????
Would it be foolish to replace them and see if this solves the problem?It was a great sounding amp.They are only about 75 cents apiece.I`ve only built an 18 watt and know zip about these transistors.
Thanks for any help
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Legend Amp
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mark0614
- Occasional poster
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- Location: Sydney Australia
Dear Goat
The first thing I would do is to try and hunt down a circuit. You might find one at Blueguitar. I would also try asking at Ampage, and at the WeberVST amp BB.
The 4558 IC's would only be used for signal level stuff, I would be doing what you are doing now, and that is firstly making sure the power supply is okay and then finding what part of the amp is responsible for the fault.
My guess would be the output stage.
Good luck with the amp, I'm sure you'll find the fault.
Yours Sincerely
Mark Abbott
The first thing I would do is to try and hunt down a circuit. You might find one at Blueguitar. I would also try asking at Ampage, and at the WeberVST amp BB.
The 4558 IC's would only be used for signal level stuff, I would be doing what you are doing now, and that is firstly making sure the power supply is okay and then finding what part of the amp is responsible for the fault.
My guess would be the output stage.
Good luck with the amp, I'm sure you'll find the fault.
Yours Sincerely
Mark Abbott
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