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It's just a cabinet, would there be a fuse in that?Nate Dort wrote: Fri Sep 05, 2025 6:28 am I'd be very surprised if it's just a resistor that went bad. Most likely, one of the output transistors is fried and took out the resistor. If it's not even powering on, I suspect the fuse blew as well.
Yup. 47Ω, 1 Watt, Metal Film resistor. And its burnt up. You can see two other healthy looking ones on the board with the yellow, orange, and brown stripes.GuyLaCroix wrote: Fri Sep 05, 2025 12:37 pm https://photos.app.goo.gl/kGGNugyMLeVfX99JA
Is this a helpful photo?
Sorry, I thought we were talking about a combo amp. That's the crossover network we're looking at. Is there a tweeter in this thing?GuyLaCroix wrote: Fri Sep 05, 2025 12:36 pmIt's just a cabinet, would there be a fuse in that?Nate Dort wrote: Fri Sep 05, 2025 6:28 am I'd be very surprised if it's just a resistor that went bad. Most likely, one of the output transistors is fried and took out the resistor. If it's not even powering on, I suspect the fuse blew as well.
Bless you.Dr Tony Balls wrote: Mon Sep 01, 2025 7:09 amIts EHX, there arent reliable schematics and there are variations, but in general the Mig 50 is a plexi type amp. Both of these schematics come up and are very close to each other, certainly enough for repair:Mickey242 wrote: Sun Aug 31, 2025 8:47 pm Really want to fix my Sovtek MIg-50 but cant find a reliable schematic.
https://schematicheaven.net/newamps/sovtek_mig50.pdf
https://el34world.com/Forum/index.php?a ... 2110;image
This is not to be confused with a Mig-50H, however, which is cascaded front end 2203/2204 style circuit.
Tweed Bassman, not SF/BF, but the disambiguation is key.
There seems to be 60Hz-ish hum coming out of all outputs. Tony Gave me two great schematics. I"m going to be good . Thanks.TylerDeadPine wrote: Sun Aug 31, 2025 10:21 pmIt’s generally a bassman, what’s wrong with it? I have one, have had to fix it without schematicMickey242 wrote: Sun Aug 31, 2025 8:47 pm Really want to fix my Sovtek MIg-50 but cant find a reliable schematic.
It does have a tweeter. I looked at the speakers and they seemed fine, I guess I gotta get into the front of it and take another look.Nate Dort wrote: Fri Sep 05, 2025 2:08 pmSorry, I thought we were talking about a combo amp. That's the crossover network we're looking at. Is there a tweeter in this thing?GuyLaCroix wrote: Fri Sep 05, 2025 12:36 pmIt's just a cabinet, would there be a fuse in that?Nate Dort wrote: Fri Sep 05, 2025 6:28 am I'd be very surprised if it's just a resistor that went bad. Most likely, one of the output transistors is fried and took out the resistor. If it's not even powering on, I suspect the fuse blew as well.
Curious why it failed in the first place. Did it desolder itself?
Have you checked the resistance of the speakers? I bet one or more of them is blown.
You could just disconnect the tweeter and bypass the crossover entirely if you wanted.
If it still has the plastic jacks I would start with replacing all of those cause they WILL break anyway - have fun. Love that amp.Mickey242 wrote: Fri Sep 05, 2025 9:02 pmThere seems to be 60Hz-ish hum coming out of all outputs. Tony Gave me two great schematics. I"m going to be good . Thanks.TylerDeadPine wrote: Sun Aug 31, 2025 10:21 pmIt’s generally a bassman, what’s wrong with it? I have one, have had to fix it without schematicMickey242 wrote: Sun Aug 31, 2025 8:47 pm Really want to fix my Sovtek MIg-50 but cant find a reliable schematic.
Same thing with the plastic toggle switches.TylerDeadPine wrote: Sat Sep 06, 2025 12:48 pmIf it still has the plastic jacks I would start with replacing all of those cause they WILL break anyway - have fun. Love that amp.Mickey242 wrote: Fri Sep 05, 2025 9:02 pmThere seems to be 60Hz-ish hum coming out of all outputs. Tony Gave me two great schematics. I"m going to be good . Thanks.TylerDeadPine wrote: Sun Aug 31, 2025 10:21 pm
It’s generally a bassman, what’s wrong with it? I have one, have had to fix it without schematic