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91
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by cosmic erosion on February 05, 2018, 01:58:32 pm »
Only when notes are being played. Ordered all new tubes and caps. Just waiting on them to arrive and when they're installed, go through everything that's been suggested on this site and the gear page.
92
Bands Using SUNN / Blues Magoos - full Sunn backline
« Last post by GrannyGremlin on February 05, 2018, 01:48:13 pm »
https://www.youtube.com/watch?v=XGQxUQfbEz4

I dunno how long they used it, just this show or what, but there it is.
93
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by GrannyGremlin on February 05, 2018, 11:03:16 am »
Is the weird noise all the time (e.g. when you're not playing) or only when you strum a note?

94
DIY / Re: Sunn Concert Lead 7 Pin Footswitch SUCCESS!!!mostely
« Last post by letsneck on February 03, 2018, 04:09:08 pm »
I have a couple of questions for you on this amazing find on Amazon. I know that it's asking a super lot of you, but would you be willing to email me some gut shots of the wiring inside the footswitch enclosure and at the plug, or draw a quick sketch of the wiring and plug pin assignments? I have a friend that has been looking to footswitch for years. I'd love to surprise her on her birthday with a brand new custom (built with love by me of course) footswitch.
95
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by cosmic erosion on February 02, 2018, 01:39:07 pm »
Greg, i appreciate the well thought out answer. I haven't tested the head off the cab. Such an obvious thing yet i didn't think of that!
96
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by Soundmasterg on February 02, 2018, 12:12:00 pm »
Does the amp/cabinet combination make the noise if the amp head is NOT on the cabinet or only when it is on the top of the speaker cabinet? It could be a vibration induced noise. I repaired one years ago that would make a strange noise like that but only when it was on top of the cabinet and vibrating. It was a loose/bad solder joint in the PCB on that amp for a cap. It seems really strange to me that the tech is saying the problem is with one of the taps...OT's very rarely fail like that. I could see thinking it if the amp was in a barn exposed to moisture and rats or something but I think it is more likely something got knocked loose in the fall such as a solder joint or perhaps a part that looks ok on the outside is bad now and you can't find it because it isn't obvious.

Greg
97
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by Isaac on February 02, 2018, 09:56:33 am »
1.) Not knowing what is causing the problem, I have no opinion on whether or not it will cascade over to the 16 ohm winding.

2.) I have a 200S with a switch to cut out the feedback. I agree, the sound is worse.
98
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by cosmic erosion on February 01, 2018, 12:13:27 pm »
Thanks for the replies guys. Much appreciated. So my thoughts:

1.) I know the 8 ohm cab can only run at 8, or if rewired, the ohms Isaac said. My question is, if I respeaker it all to 16 ohm speakers and make the cab 16 ohms and run out of the 16 ohm tap on the head, will this noise continue to be a problem and cascade over into the 16 ohm tap down the line? A hard what if, but i'm trying to understand the problem that's making the sound and how to fix it. Obviously, respeakering the cab or buying a new cab would be my easiest solution (if that is the solution).

2.) This problem just started within the last 3 weeks or so. I've ran this head and cab combo for a little over 4 years together (I've had the cab with said speakers now almost 10 years, used it with a studio pa, coliseum pa, sceptre, 2 v4s, a beta bass, and 2 traynor yba1s) with no issues. The sound was also worse with the negative feedback wire disconnected (it originally was) and just reconnected the last time my tech had it.
99
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by Isaac on February 01, 2018, 10:29:03 am »
No, you can't rewire an 8 ohm 4x12" for 16 ohms. 2, 8 and 32 are your only choices.

You could try using the 16 ohm jack. Tube amps are very forgiving that way.
100
Q & A / Re: '69 sunn solarus issues (warning: long post)
« Last post by _peter on February 01, 2018, 07:55:51 am »
Hi,

if the problem depends on the cab but the cab itself is fine, I would suggest to disconnect the negative feedback wire for testing purposes.

It is coming from the output transformers secondary and sends a part of the output signal back into the preamp.

If the weird sound disappears, it might be an oscillation that only occurs when the amp is paired with the complex impedance response of your cab.

So that may help to isolate the bug.

Best,
Peter
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