bitomaxsp
Member
Hi AK members.
I own 1030 for about a year. Bought it for 130EUR and enjoyed so far. I knew it was in original state and untouched inside. Only lamps were changed. My dirty hands started itching and I decided to check main PSU voltages. They were quite off, more than 10%. I decided I'd do the recap and also replace PSU board and filter board with new ones. Seems like fun project to play
What I discovered along the way, heh... Schematic was not precise for PSU. Main AMP has quite different static either. Filter board (in the protection side) absolutely different except FM muting and filters itself.
I have experience doing stuff in Kicad, so I decided to contribute to open source a bit.
If anyone interested in having new PSU pcb you can use it for free (https://github.com/bitomaxsp/aa-1030-psu). All you need to do is to check it matches you schematic, modify if needed, make berbers and order.
I ordered rev.A and it works in my receiver very well. (in the repo there is rev.B which is more friendly for mounting. Made it after spent some time with rev.A at hand).
I also made new PCB for filter P.C. board, but not ready to make it open source. I'll put schematic here, as I noticed people incorrectly replace WZ-033 for diodes there NOTE: Mind the PCB number in the Title!
I made schematic from PCB and then double, triple checked it. Now new PCB work in my receiver. (will post repo link soon). PDF is attached to the post.
I also made transistor matcher, to match diff amp transistors. I replaced 2SA640 with KSA992. My 640were just fine , but I checked how they matched, and they were off ~2mV, I matched mine to sub mV.
For transistor matcher I also made PCB, but this time myself. Will open source it soon too.
I used this video:
and this fantastic article: https://dragonflyalley.com/synth/images/TransistorMatching/ianFritz-transmat0011_144.pdf
I also made 200W dummy load (with fault detection circuits) to test output power. Just bunch of 8)hm res on the big heatsink. Nothing special.
Anyway, this project is still going.
I own 1030 for about a year. Bought it for 130EUR and enjoyed so far. I knew it was in original state and untouched inside. Only lamps were changed. My dirty hands started itching and I decided to check main PSU voltages. They were quite off, more than 10%. I decided I'd do the recap and also replace PSU board and filter board with new ones. Seems like fun project to play
What I discovered along the way, heh... Schematic was not precise for PSU. Main AMP has quite different static either. Filter board (in the protection side) absolutely different except FM muting and filters itself.
I have experience doing stuff in Kicad, so I decided to contribute to open source a bit.
If anyone interested in having new PSU pcb you can use it for free (https://github.com/bitomaxsp/aa-1030-psu). All you need to do is to check it matches you schematic, modify if needed, make berbers and order.
I ordered rev.A and it works in my receiver very well. (in the repo there is rev.B which is more friendly for mounting. Made it after spent some time with rev.A at hand).
I also made new PCB for filter P.C. board, but not ready to make it open source. I'll put schematic here, as I noticed people incorrectly replace WZ-033 for diodes there
NOTE: Mind the PCB number in the Title!I made schematic from PCB and then double, triple checked it. Now new PCB work in my receiver. (will post repo link soon). PDF is attached to the post.
I also made transistor matcher, to match diff amp transistors. I replaced 2SA640 with KSA992. My 640were just fine , but I checked how they matched, and they were off ~2mV, I matched mine to sub mV.
For transistor matcher I also made PCB, but this time myself. Will open source it soon too.
I used this video:
I also made 200W dummy load (with fault detection circuits) to test output power. Just bunch of 8)hm res on the big heatsink. Nothing special.
Anyway, this project is still going.