Motor seemed like a 'weak sister' cheap brush holders etc, I ended up using an RC Car motor, RC280 IIRC? I was lucky to get a second one gut seemed to indicate motor ran but I haven't gotten into it yet. My Dad was a Philco manager sent to start up start a TV plant in Mexico City when these came out and he got one of these amps as a sample at work and gave it to me as a electronics training 'toy when I was ~6 years old, but I destroyed it and left the remains behind when we moved to NorCal in '57 then recently found out where that wonderous little amp was used! Now blessed to have two:-) Thanks for the view! This amp became "thermo-mechanically electrically intermittent causing a severe loss of volume, needs troubleshooting but I heard a nasty rumour about fine transformer windings and shrinking shellac encapsulant :-/ Message me at fb dot com /GTA351C I have some literature pics collected
@@GTA351C Thank you very much. I tested my circuit board...I removed it from the unit... connected to a 5.5v wall supply and injected an 800HZ signal in it. I used a signal tracer around the board and found a few resistors that were flaky.. replaced then and now its good. I also changed C1 which is a bumblebee Cap and known to always be bad. Sent you a DM on fb
Hi there.... I am restoring one of these... was your motor working ok when you got it ? Mine seems to be very slow ?
Motor seemed like a 'weak sister' cheap brush holders etc, I ended up using an RC Car motor, RC280 IIRC? I was lucky to get a second one gut seemed to indicate motor ran but I haven't gotten into it yet. My Dad was a Philco manager sent to start up start a TV plant in Mexico City when these came out and he got one of these amps as a sample at work and gave it to me as a electronics training 'toy when I was ~6 years old, but I destroyed it and left the remains behind when we moved to NorCal in '57 then recently found out where that wonderous little amp was used! Now blessed to have two:-) Thanks for the view! This amp became "thermo-mechanically electrically intermittent causing a severe loss of volume, needs troubleshooting but I heard a nasty rumour about fine transformer windings and shrinking shellac encapsulant :-/ Message me at fb dot com /GTA351C I have some literature pics collected
@@GTA351C Thank you very much. I tested my circuit board...I removed it from the unit... connected to a 5.5v wall supply and injected an 800HZ signal in it. I used a signal tracer around the board and found a few resistors that were flaky.. replaced then and now its good. I also changed C1 which is a bumblebee Cap and known to always be bad. Sent you a DM on fb
@@rciancia thx how'd you get +/- out of a wall supply?
@@GTA351C _ used a USB cable in a hard wired USB port. A clean 5.5v - enough for the unit to run.