This is the Red Knob "The Twin" that I'm currently reconditioning.
.
- The_Twin1.jpg (258.67 KiB) Viewed 785 times
- The_Twin2.jpg (248.91 KiB) Viewed 785 times
- The_Twin3.jpg (318.79 KiB) Viewed 785 times
Fender "The Twin" PCB issues
-
laurie
- Posts: 2390
- Joined: Fri Aug 17, 2018 2:07 am
- Location: Canada
- SBZ: Multi Platinum
- Bossarea: Multi Platinum
Fender "The Twin" PCB issues
Early Fender PCB amps *always* have heat related issues. Always.
This is the Red Knob "The Twin" that I'm currently reconditioning.
. . .
This is the Red Knob "The Twin" that I'm currently reconditioning.
. . .
-
laurie
- Posts: 2390
- Joined: Fri Aug 17, 2018 2:07 am
- Location: Canada
- SBZ: Multi Platinum
- Bossarea: Multi Platinum
Re: Fender "The Twin" PCB issues
- The_Twin4.jpg (298.88 KiB) Viewed 784 times
- The_Twin5.jpg (353.46 KiB) Viewed 784 times
- The_Twin6.jpg (173.54 KiB) Viewed 784 times
-
laurie
- Posts: 2390
- Joined: Fri Aug 17, 2018 2:07 am
- Location: Canada
- SBZ: Multi Platinum
- Bossarea: Multi Platinum
Re: Fender "The Twin" PCB issues
The original 10W board mounted resistor arrangement could never (ever) have been OK. There is simply too much heat for that arrangement. The replacement resistors are specifically for high power dissipation and they mount to a heatsink. This is the correct engineering for this circuit.
.
.
- 25W.png (78.69 KiB) Viewed 783 times
-
Pepe
- Posts: 2425
- Joined: Thu Aug 16, 2018 2:19 pm
- Location: Germany
- SBZ: Multi Platinum
- Bossarea: Double Platinum
- Contact:
Re: Fender "The Twin" PCB issues
What an awful design! 
Good luck with the rest of the story!
Good luck with the rest of the story!