• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Fisher SA-300

Francois G

Paid Member
2004-06-16 8:36 pm
I have a Fisher SA-300 amplifier that I want get back up and running. I have been looking at .....
Does anyone here have this amplifier?

Sorry, I don’t. Not sure what you are asking but here is my shot at proving answers to what I think you wanted to know.

I have followed Dave Gillespie’s advice on a few occasions with good success. Most recently a Dynaco SCA-35 rebuilt with his boards and power supply, that performs delightfully. You wouldn't go wrong with Mr. Gillespie’s recommendations. Only issue is that some collectors may prefer an unmolested classic and not like a modified and improved SA-300, so, your amp may be devalued. Good luck with your decision and project.
Hi Francois G,

I am asking if there are any SA-300 owners here. Yes, Dave Gillespie is very talented.
From the article link in my first post Dave mentioned the biggest reason to perform the modification, "as is" the amplifier in its stock form is very hard on
tubes, operating at 78mA per tube. I have to replace a quad set of Sylvania 6CA7s as we speak. So, to operate the amplifier with modern production tubes and help the amplifier from cooking its self to death, plus I plan to keep the amp.
The modifications that Dave suggest seems the way to go for me too.