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Solo 610 issue

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Solo 610 issue

Postby Peter Uhr » Fri Aug 09, 2019 7:33 am

Anyone who has a tip to fix a solo 610. Gain extremely low and not resolved by tube swap.
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Re: Solo 610 issue

Postby Martin Walker » Fri Aug 09, 2019 10:39 am

Hi Peter Uhr, and welcome to the SOS Forums! 8-)

Unfortunately, the vast majority of electrical faults cannot be diagnosed or cured using 'tips' - you need to do some proper and systematic fault-finding, preferably with a circuit diagram to hand. Simply replacing tubes/valves might just work in the odd case, but not as a rule.

If you don't have any electronic knowledge then it's really far safer to approach a repair engineer, as the 610 has mains and high DC voltages inside that could potentially kill.

What might help though is if you provide more detail on exactly what happened:

1. Was this low gain something that happened suddenly?

2. Were there any burning smells when it happened?

3. Are there any signs of burn marks inside the unit, on the circuit board, or in the vicinity of particular components?

Any more information like this might at least help us narrow down possible causes so you have a better idea of what's happened before you approach a repair engineer.

The Solo 610 is a very popular mic preamp, so there are bound to be other owners here on the SOS Forums that might just shed some light on your problem.


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Re: Solo 610 issue

Postby Hugh Robjohns » Fri Aug 09, 2019 10:54 am

I second all of Martin's comments!

However, if you haven't already, I'd first check that the mic/line output level switch at the back hasn't been knocked into the mic position by accident. If it has that would certainly produce the 'low gain' symptom you describe.

If that's good, check all the other switches and rotary controls, just in case they've become dirty and are interfering with the signal path.

Obviously, low gain could be due to a failed valve, and I assume you've swapped both out to test that notion. But if the gain has suddenly gone low for no obvious reason it's probably more likely to be a power supply failure and, given the very high anode (plate) voltages involved, that's not something to try and fix unless you have the appropriate training and experience in fault-finding valve equipment.

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Re: Solo 610 issue

Postby Peter Uhr » Sat Aug 10, 2019 7:48 am

Thanks for feedback. Bought the solo second hand. No burn marks inside. Switshes oki. Maybe power supply issue. Will let a PRO take a look...
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Joined: Fri Mar 22, 2019 8:41 am


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