Fisher 440t power switch

[Drrickoxman]

Help! I'm giving this vintage audio addiction another try. I picked up a Fisher 440t at an estate sale and it worked with tons of static and a hard to turn volume power switch. Cleaned and deoxit and resoldered spliced power cord. She looks great, but now no power on. I heard the volume pot/power switch on these like to go out so I checked continuity through switch, seems fine ,also checked power through aux outlets and power switch also seems fine and lastly checked for DC voltage coming out of transformer, got some , the unit powered on before I fixed it, lol . Any thoughts on what I did to this beauty?? Btw she has the most beautiful wood case with a lattice wood? vent instead of metal

 

[Binkman]

Welcome to A.K. !
Probably a fuse. service manual reads (F1) 1.5A slow blow. On the back panel? Pull and test.
service manual (good one) https://www.hifiengine.com/manual_library/fisher/440-t.shtml
Since it was working probably not healthy inside as aged (1965). You really should build a dim bulb tester.

 

[Drrickoxman]

Welcome to A.K. !
Probably a fuse. service manual reads (F1) 1.5A slow blow. On the back panel? Pull and test.
service manual (good one) https://www.hifiengine.com/manual_library/fisher/440-t.shtml
Since it was working probably not healthy inside as aged (1965). You really should build a dim bulb tester.
View attachment 1498295

Thanks for the reply! Checked the fuses and they both seem ok . What do I use the dim bulb tester for? After what I did to the unit, I think myself??

 

[fred soop]

Try cleaning the inside of the fuse holder. That is easily overlooked when cleaning pots and switches but still is a spring loaded mechanical contact that could cause trouble. You can also temporarily bypass the fuse or switch with a jumper wire. Might be safer to use an ohmmeter at the line cord and check resistance when jumpering rather than doing it when connected to power.

 

[Drrickoxman]

Awesome will do thanks !!