Sunn Beta Lead Restoration

[loudthud]

I ordered the switch and it fits. Read about it here:

Power Switch for Beta Lead or Beta Bass

[oldmanmason]

Hello, new to the forum and was curious if you still happen to have that beta manual on hand?

[gbono]

try here Sunn Beta Lead (looking for schematics)

[oldmanmason]

Thanks gbono! That was easy i appreciate the help

[LowBassDub]

Thanks gbono! That was easy i appreciate the help

beta directory | The Unofficial Sunn Musical Equipment Web Site

[oldmanmason]

beta directory | The Unofficial Sunn Musical Equipment Web Site

Thank you guys for all the help!

[Lester Paulsen]

Hello, new to the forum;

I have two Sunn Beta Lead combos for playing in stereo. One of them has this problem - the volume cuts out with a “pop” noise when I am not playing notes on guitar - after picking notes or strumming, the volume/sound returns, but then cuts out again.
I am guessing that it’s a bad capacitor somewhere - has anyone experienced or repaired a similar problem?

[loudthud]

I ordered the switch and it fits. Read about it here:

Power Switch for Beta Lead or Beta Bass

The link above is broken, here's the new link: https://forum.sunnstillshines.online...21997#msg21997

[Enzo]

Hello, new to the forum;

I have two Sunn Beta Lead combos for playing in stereo. One of them has this problem - the volume cuts out with a “pop” noise when I am not playing notes on guitar - after picking notes or strumming, the volume/sound returns, but then cuts out again.
I am guessing that it’s a bad capacitor somewhere - has anyone experienced or repaired a similar problem?

Hi
First, please start a new thread for your amp. It gets confusing when we have more than one of an amp being repaired in a thread.

Bad cap wouldn't be my first thought, but is certainly possible, I would be whacking on the boards with a chopstick, I would be comparing DC voltages in the circuit to those on the schematic.

[The Dude]

Have you tried cleaning the loop "accessory"jacks? You could just have an intermittent switching jack.

[Lester Paulsen]

Hi
First, please start a new thread for your amp. It gets confusing when we have more than one of an amp being repaired in a thread.

Bad cap wouldn't be my first thought, but is certainly possible, I would be whacking on the boards with a chopstick, I would be comparing DC voltages in the circuit to those on the schematic.

I’m sorry for not starting a new thread; I should know better - I don’t understand what you mean by “whacking on the boards with a chopstick” - I can compare the voltages; I have an electrical engineer to help me - he was a chip designer by profession. Thanks for the reply.

[Lester Paulsen]

Have you tried cleaning the loop "accessory"jacks? You could just have an intermittent switching jack.

I’ll give that a try. Thanks, Dude.

[Enzo]

If there is a faulty solder connection or a crack in the copper traces, pushing and [robing each part physically may help expose that. Since we are working on it live, we cannot use something like a metal screwdriver, so many of us use a common wooden chopstick, like from a Chinese restaurant. It is insulated and sturdy. SO by whacking on it, I simple mean push and probe about the circuit with the stick. It exposes something or it does not.

And I want you to check DC voltages through teh circuit. If teh base is biased way off, it may take a lot of signal to overcome that, and so it reacts unusually.

[Lester Paulsen]

If there is a faulty solder connection or a crack in the copper traces, pushing and [robing each part physically may help expose that. Since we are working on it live, we cannot use something like a metal screwdriver, so many of us use a common wooden chopstick, like from a Chinese restaurant. It is insulated and sturdy. SO by whacking on it, I simple mean push and probe about the circuit with the stick. It exposes something or it does not.

And I want you to check DC voltages through teh circuit. If teh base is biased way off, it may take a lot of signal to overcome that, and so it reacts unusually.

Thanks, Enzo. I think I understand. I’ll get with my friend the EE and fill him in on your suggestions. Stay tuned…