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Crack / Re: Left Channel Spontaneously Dead
« Last post by Voxelr on Yesterday at 08:32:40 PM »Actually, I guess replacement RCA 6080's are cheaper than I thought. I might just eat the cost on one to have something to A/B test with here.
Recent Posts
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Crack / Re: Left Channel Spontaneously Dead
« Last post by Voxelr on Yesterday at 07:37:07 PM »Dang, ok, a tube problem would make sense considering it seems like one of the few parts to likely age out. I don't have any replacements off-hand, but I was considering rolling a new tube or two before this issue. So, I'm not that opposed to just buying a new one anyway. Is there a great way of diagnosing a tube problem at home, or does it just boil down to try a new one and see if it works? It would be nice to gain some confidence on a bad tube before making the financial investment, but if not, then it is what it is.
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Crack / Re: Left Channel Spontaneously Dead
« Last post by Paul Birkeland on Yesterday at 03:46:27 PM »That's pretty informative. Half of the 6080 isn't conducting, or being allowed to conduct potentially. Do you have a different 6080 to try just to rule that out? The +80V of bias on that half of the 6080 should result in enormous current draw, but perhaps there's something amiss with the 6080 that isn't allowing it to work.
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Crack / Re: Left Channel Spontaneously Dead
« Last post by Voxelr on Yesterday at 09:40:18 AM »Ok, here's what I was able to gather
1 87.5
2 197.5
3 0
4 197.5
5 82.5
6 0
7 110.6
8 0
9 1.47
10 0
Small board
OA 83.8
IA 197.5
B-A/B 0
IB 197.5
OB 82.5
Big board
OA 1.45
OB 112.2
G 0
B+ 197.5
1 87.5
2 197.5
3 0
4 197.5
5 82.5
6 0
7 110.6
8 0
9 1.47
10 0
Small board
OA 83.8
IA 197.5
B-A/B 0
IB 197.5
OB 82.5
Big board
OA 1.45
OB 112.2
G 0
B+ 197.5
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Crack / Re: Left Channel Spontaneously Dead
« Last post by Voxelr on Yesterday at 09:09:46 AM »Thanks for getting back with me, Paul. I ran the checks before and only noticed issues with the two aforementioned terminals. Let me double check my results and post the full readings. I'll follow up shortly
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Eros Phono / Re: Original Eros resistance check tolerances
« Last post by Paul Birkeland on Yesterday at 08:36:05 AM »There are caps and other components back in the EQ circuit that can cause those values to measure differently depending on the meter used, so really it's just important to make sure the terminals that are supposed to be 0 ohms are very close to zero, and nothing else shows up as zero that shouldn't be.
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Crack / Re: Left Channel Spontaneously Dead
« Last post by Paul Birkeland on Yesterday at 08:32:05 AM »You will need to perform the voltage check provided in the build manual in order for us to provide any information on what might be going on.
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Crack / Re: Low noise + wrong voltages
« Last post by Paul Birkeland on Yesterday at 08:30:40 AM »The 1.5V at both A3 and A8 in conjunction with the high voltage at OB on the small board would have me looking for pins touching on the bottom of that C4S board that shouldn't be, and also double checking that a 12AU7 is installed in the 9 pin socket. The solder joints on the bottom of that PC board make it look like half of the components were replaced at a certain point, is that possibly related to what's going on?
Could you post some more photos of the build? (including the top side of the PC board)
Could you post some more photos of the build? (including the top side of the PC board)
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Crack / Left Channel Spontaneously Dead
« Last post by Voxelr on May 26, 2024, 09:46:23 PM »Hello! I have had an issue with my Crack + Speedball and would super appreciate some help, if possible. My knowledge and experience with DIY electronics is beginner, at best, so bear with me.
I had bought the Crack + Speedball kits a few years back, and was able to put them together and enjoy a working kit for a couple years, but I turned the amp on one day to discover that the left channel had gone out. Up until then, everything worked perfectly fine.
I've finally gotten around to pulling it back out and trying to get it to work again and could use some pointers.
A couple things to note:
Otherwise, I have been unable to observe anything else wrong. Any help here would be appreciated! Thank you
I had bought the Crack + Speedball kits a few years back, and was able to put them together and enjoy a working kit for a couple years, but I turned the amp on one day to discover that the left channel had gone out. Up until then, everything worked perfectly fine.
I've finally gotten around to pulling it back out and trying to get it to work again and could use some pointers.
A couple things to note:
- The two LED's on the Speedball's big board towards the bottom right (picture attached) no longer light up.
- I tried running the voltage tests in the docs. Of note, terminals 9 and OA both seemed to measure ~1.4V. Everything else appeared to fall within expected values
Otherwise, I have been unable to observe anything else wrong. Any help here would be appreciated! Thank you
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Crack / Re: Low noise + wrong voltages
« Last post by vermeil on May 26, 2024, 10:28:25 AM »We went over the soldered spots again and the voltages have not changed