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Posted Tue Feb 13, 2018 8:19 AM
Posted Fri Feb 23, 2018 1:51 PM
Power supply delivered and I fitted it last night. Game working again - adjusted the pot to 5.02v.
The power supply is a different revision - the components look different and there is a 4th connector on the board (the original had 3) and I'm getting a different explosion sound - not sure if that is the reason. The board is also the amplifier. The sound of the explosions aren't as good which is a bit of a pity - but other sounds are just as before. Test mode reports all OK on the game board.
Thinking of getting the old board repaired now as a spare. Would be a shame to trash it. If I get that done it would be interesting to see if the sound improves with it.
I was getting flicker on the display (was getting it before the power supply failed - the brightness was adjusting up and down momentarily. It seemed to settle down as the game "warmed up") - have twiddled the brightness and contrast pots on the display board and that seems to have resolved it - will look out for that - hoping that it is sorted.
Edited by davyK, Fri Feb 23, 2018 1:56 PM.
Posted Sat Mar 3, 2018 4:12 PM
Edited by davyK, Sat Mar 3, 2018 4:12 PM.
Posted Mon Mar 5, 2018 5:02 AM
Sounds like TNT Rocks!
Posted Mon Mar 5, 2018 5:00 PM
Edited by davyK, Mon Mar 5, 2018 5:01 PM.
Posted Mon Mar 5, 2018 6:06 PM
They're sure doing right by trying to make it right. That's a plus on the report card. If I were them I would do a little bit of measuring, testing, and burn-in. Paying attention to things like if the CRT can maintain the image size over time, and if the voltages are rock solid as are the oscillators. And will the console/cab work in more extreme environments like a garage in summer or a cold basement in winter. Things like that.
It's just a thought. It's what I do when I build an emulation rig for someone. Even though it's all ordered-on-demand consumer parts, I do some checks and tests and purchase higher-quality parts. Understand that by default I have to make sure the hardware is 100%. Emulators can be finicky and tricky and even buggy, so I don't want hardware entering into the equation, hence the extra effort.
Regarding your sound, I don't know the specifics about the power supplies used or what it sounded like before, and now. If it was mine, and I was having a fit over sound quality changes I might plug in the original Pokey and make a scope measurement, then do the same with the new chip. And again with the old vs new power supply.
These electronics are 40 years old. They're going to age and do it at different rates depending on many factors. There's different models and revisions, too. All in all there's factors coming into play now, that were of no consequence when these things rolled off the assembly line. It's the nature of the hobby!
But again, looks like they're trying to make it right. And that's all one can ask for.
If brightness and contrast varied (in a random way) as the machine warmed up, it could be as simple as dirty adjustment pots. With a few degrees swing in temperature, the materials expand and contract. This can cause highly localized spot-wear on the substrate where the wiper contact moves. Like burning in a spot. Moving it, working it, cleaning, and lube, can fix this if it's not pitted across the whole band. Though that one minuscule spot will always be a problem if it's burned/corroded through, finding a fresh contact point next to it shouldn't be an issue. New resist material (carbon) can be deposited, but that's a specialty repair for rare parts.
Posted Tue Mar 6, 2018 2:18 AM
Posted Thu Mar 22, 2018 1:52 PM
Posted Tue May 15, 2018 12:52 PM
Replacement power supply on its way back to me. They had to wait for another Dx so they could test it.
Posted Tue May 15, 2018 5:03 PM
Posted Fri May 18, 2018 11:36 AM
I know! Don't mind too much since the game works OK with the replacement they sent me back in March. They had to wait on another Dx coming in to test it with. They tested it for 5 days!
Will be interesting to see if it improves the sound I'm currently getting.
Edited by davyK, Fri May 18, 2018 11:37 AM.
Posted Mon May 21, 2018 1:10 PM
Board arrived today. Just swapped it into the cabinet and that gorgeous deep bass sound of the explosions and the ship thrust is back!!!!
I'm delighted. It really does make a difference.
Big thanks to Todd at TNT.
Edited by davyK, Mon May 21, 2018 1:10 PM.
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