@curiousjim : Little known fact is that James Bongiorno joined Rectilinear to work on the model X speaker. Later he joined Spread Spectrum Technologies.
Is my Dynaco Stereo 400 worth repairing for resale?
After all the years, I’m sure it needs a good cleaning and at least all the cans replaced.
Will I even break even?
https://drive.google.com/file/d/10BBbN8Vd2_2sgQAoMI8N5CqnWdhASrbH/view?usp=drivesdk
Showing 4 responses by jasonbourne71
@buellrider97 : I have an original owner pair of 60 watt mono SS amps from South West Technical Products. Designed by James Bongiorno - full complimentary symmetrical circuit using the then-new PNP output transistors. Before that SS amps were limited to using only NPN output stages. JB went on to design the high-power Tigersaurus amp for SWTP which became the Ampzilla kit. |
Your Dynaco 400 might not need any immediate work. Put it on a variac to reform the power supply caps. Then use a multi-meter to check the DC voltage on the two speaker outputs. If those show only a few millivolts of DC try the amp with a pair of speakers. Not all old amps need parts replacement. My 40 year-old Sumo Andromeda - another Bongiorno design - has been in use 24/7 for seven years now without a hiccup! |