Pilot SA-260 amp and Fischer 400C advice - Page 2

tpageal · 6th April 2012, 03:25 AM

Thanks Eli, well this turned into a project. I didn't test the tubes first and it appears all 4 of the EL34s were bad. I've tested them now and they are all bad, I'll never know if I fried them or they were bad in the first place. After replacing the caps and turning it on there was higher than expected voltage everywhere. I did have a speaker load connected. After 3-4 minutes of the amp being on, one of the output transformer wires burned. That's been fixed by TRS. Jim McShane introduced me to Don Sachs. Jim is putting together a kit for Don to rebuild the whole amp.

tpageal · 12th May 2012, 01:31 PM

I received my amp back from Don Sachs. He replaced all of the signal path resistors and caps, all parts and Mullard EL34 reissues from Jim McShane. Rebuilt the entire power supply and made a modification to the input stage. Don redesigned the input circuit from the 12AU7 to accomodate a 6CG7. To say I am pleased with the outcome is a gross understatement. This thing sounds incredible. I will post some pictures later.

tpageal · 13th May 2012, 11:23 PM

Here are a few pics of the complete rebuild. It sounds fantastic

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6th April 2012, 03:25 AM	#11
tpageal diyAudio Member Join Date: Apr 2011 Location: Decatur, AL	Thanks Eli, well this turned into a project. I didn't test the tubes first and it appears all 4 of the EL34s were bad. I've tested them now and they are all bad, I'll never know if I fried them or they were bad in the first place. After replacing the caps and turning it on there was higher than expected voltage everywhere. I did have a speaker load connected. After 3-4 minutes of the amp being on, one of the output transformer wires burned. That's been fixed by TRS. Jim McShane introduced me to Don Sachs. Jim is putting together a kit for Don to rebuild the whole amp.

12th May 2012, 01:31 PM	#12
tpageal diyAudio Member Join Date: Apr 2011 Location: Decatur, AL	I received my amp back from Don Sachs. He replaced all of the signal path resistors and caps, all parts and Mullard EL34 reissues from Jim McShane. Rebuilt the entire power supply and made a modification to the input stage. Don redesigned the input circuit from the 12AU7 to accomodate a 6CG7. To say I am pleased with the outcome is a gross understatement. This thing sounds incredible. I will post some pictures later.