Hey folks, it's been a while since I've been here. Thought I would start a thread showing what I'm up to with this thing. I already have a couple questions.
An online friend sold me this wreck for pretty cheap. Gonna build up a 1x12 combo cab for it once I get the circuit straightened out and mate it up with an EV SRO 12" 8 ohm speaker. First order of business was to break it down to pieces and get the chassis itself cleaned up. Here's what it looked like when I started:
Pretty bad eh?? That tag board was ROUGH. Looks like the thing has definitely seen some water. While I had it apart I checked the capacitance of every cap and all were within spec except for the dual caps which are rated 25/25 and each read 38 or real close. Given that they were consistent I don't suspect a problem with them(or should I?).
Luckily another online friend sent me a stash of tag boards and one of them was an exact match. It cam already loaded with resistors, a photo-resistor, and a pair of 25/25 duals, which also had the same readings as the duals from the original board.
Also, it was missing the two 60uf filter caps and had a 20uf cap mounted outside the doghouse on a terminal rail. I got rid of it and bought a couple of proper caps to go back on there:
Here's how it came out after doing some rust removal and putting it back together. After a few days the rust started coming back in force(visible on the top edge in this pic) so I had to disassemble it again and do another round of rust removal. This time I used phosphoric acid, a baking soda wash, and final rinse.
Here's a pic before the final rust removal:
Anyway, so I got it back together today for the second time and did a quick power up and after about a minute or so (no tubes) it blew the fuse. I tried another fuse and pop, instantly. I unplugged it and didn't have any time to go further into it before heading to work.
Looking for any good resource material on testing the OT and/or PT. Also I will be going through it to make sure I didn't miswire anything, but I feel pretty confident that it is wired correctly.
I have a little experience but am no pro. I've built a couple amps from scratch and had good luck with minimal problems, and I've been able to sort out a couple of repairs on other Fender amps but it has been a while. I need to get my head back into this hobby.
Please comment, share useful resources/advice, or just chime in with whatever. I'll update as I go along. Thanks
An online friend sold me this wreck for pretty cheap. Gonna build up a 1x12 combo cab for it once I get the circuit straightened out and mate it up with an EV SRO 12" 8 ohm speaker. First order of business was to break it down to pieces and get the chassis itself cleaned up. Here's what it looked like when I started:
Pretty bad eh?? That tag board was ROUGH. Looks like the thing has definitely seen some water. While I had it apart I checked the capacitance of every cap and all were within spec except for the dual caps which are rated 25/25 and each read 38 or real close. Given that they were consistent I don't suspect a problem with them(or should I?).
Luckily another online friend sent me a stash of tag boards and one of them was an exact match. It cam already loaded with resistors, a photo-resistor, and a pair of 25/25 duals, which also had the same readings as the duals from the original board.
Also, it was missing the two 60uf filter caps and had a 20uf cap mounted outside the doghouse on a terminal rail. I got rid of it and bought a couple of proper caps to go back on there:
Here's how it came out after doing some rust removal and putting it back together. After a few days the rust started coming back in force(visible on the top edge in this pic) so I had to disassemble it again and do another round of rust removal. This time I used phosphoric acid, a baking soda wash, and final rinse.
Here's a pic before the final rust removal:
Anyway, so I got it back together today for the second time and did a quick power up and after about a minute or so (no tubes) it blew the fuse. I tried another fuse and pop, instantly. I unplugged it and didn't have any time to go further into it before heading to work.
Looking for any good resource material on testing the OT and/or PT. Also I will be going through it to make sure I didn't miswire anything, but I feel pretty confident that it is wired correctly.
I have a little experience but am no pro. I've built a couple amps from scratch and had good luck with minimal problems, and I've been able to sort out a couple of repairs on other Fender amps but it has been a while. I need to get my head back into this hobby.
Please comment, share useful resources/advice, or just chime in with whatever. I'll update as I go along. Thanks
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