Recent Posts

1

Crack / Re: Left Channel Spontaneously Dead

« Last post by Voxelr on Today at 08:54:41 AM »

Yea, seems a bit odd to me too as the unit just lived on my desk when the issue surfaced. Anyways, I'll order another 6080 to see if that solves my problem. I'll let you know how it goes. Thanks for the help Paul, I genuinely appreciate it.

2

Crack / Re: Left Channel Spontaneously Dead

« Last post by Paul Birkeland on Today at 04:51:11 AM »

I think it's a good idea just to rule that out.  There are some pieces inside a 6080 that can come dislodged and prevent one half from operating from a very hard jarring, but I've also dropped 6080s on the floor and continued to use them with no issues.  This kind of issue isn't what I would expect from a tube that's exhausted, it's more like some kind of internal damage.

3

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.

4

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.

5

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.

6

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

7

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

8

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.

9

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.

10

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)