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Thunder 1A no sound

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Post by andyp on Sat Jun 27, 2020 2:57 pm

Hello All
Have just picked up a Thunder 1A left handed model. There doesn't appear to be any sound unless I tap the pickups with the amp volume on full. It seems that the guitar volume control works as does the coil tap switch & the pickup selector. 
I did know it wasn't working properly as I got it cheap as a project. Wondering if anyone has any advice/words of wisdom?

Thanks
Andy
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Post by Sgt. Vimes on Sat Jun 27, 2020 3:34 pm

Try getting contact cleaner in the selector switch and inside the pots, check the jack socket for corrosion. 
Have a look for obvious short circuits inside the cavity and make sure nothing is touching the circuit board when the plate closes
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Post by andyp on Sat Jun 27, 2020 3:55 pm

Thanks. I have given a quick spray with contact cleaner with no change, & the Jack socket appears corrosion free. I'll have another go tomorrow
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Post by Barry on Sat Jun 27, 2020 4:51 pm

You should still be getting a response from the passive pickups regardless, but just for the hell of it, have you checked the batteries, especially for corrosion?

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Post by andyp on Sat Jun 27, 2020 4:56 pm

I did put fresh batteries in. Does it need batteries all the time? The equaliser switch doesn't switch,  and crackles when I move it.
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Post by Barry on Sat Jun 27, 2020 11:32 pm

Nope. The pups are passive and will work like a normal guitar. The batteries are for the boost circuit (AKA the Thunder!). I wanted you to check for corrosion there too.

Corrosion does sound like that is the problem from what you're describing.
As Sgt Vimes has directed contact cleaner is your first line of attack. You'll likely need to use it several times, making sure you're squirting it in the right places and working from inside the control cavity. Work the pots and switches liberally and let dry.

Next step would be checking all the solder joints to make sure they're solid. If anything looks suspicious you can re melt it.

If that fails then you'll need to check the main circuit wiring with a mult-imeter for continuity.
Component replacement would be a final operation.

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Post by andyp on Sun Jun 28, 2020 1:17 pm

Well I spent the day spraying contact cleaner, & now all of a sudden the guitar has come to life!! It's not perfect, but it's looking like i might've had a bargain. Thanks.
 Now need to get a new nut & a set of switches. Any suggestions please?
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Post by Sgt. Vimes on Sun Jun 28, 2020 1:48 pm

https://uk.farnell.com/multicomp/1md3t6b11m1qe/switch-dpdt/dp/9473670?gclid=Cj0KCQjw0Mb3BRCaARIsAPSNGpUrsVXTqKXM2jmyr_OYbaWWlJyUlefDCggFhjmYj1sw83JpeL8APaYaAls_EALw_wcB&gross_price=true&mckv=sk894kdvA_dc
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Post by Sgt. Vimes on Sun Jun 28, 2020 1:51 pm

Not sure what circuit you have, but this is the active on/off for the active gain models, I suspect its the same for the active eq too

https://cpc.farnell.com/multicomp/1m41t6b11m1qe/switch-4pdt/dp/SW02871?CMP=i-ddd7-00001003
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Post by andyp on Sun Jun 28, 2020 2:33 pm

Thanks Sgt. Vines. The broken eq switch on my guitar only has 6 prongs on the bottom so dont know if it's the wrong one. Do you know if the same company supply the switch for the phase? Only so I dont have to pay £5 post for one switch!
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Post by Sgt. Vimes on Sun Jun 28, 2020 2:55 pm

The first link is for the phase switch
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Post by andyp on Sun Jun 28, 2020 3:03 pm

Sorry didn't see that link. That one is on/off/on, is that right?
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Post by Barry on Sun Jun 28, 2020 5:26 pm

andyp wrote:Well I spent the day spraying contact cleaner, & now all of a sudden the guitar has come to life!! It's not perfect, but it's looking like i might've had a bargain. Thanks.
 Now need to get a new nut & a set of switches. Any suggestions please?
Yesss! Twisted Evil

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Post by Sgt. Vimes on Sun Jun 28, 2020 5:28 pm

andyp wrote:Sorry didn't see that link. That one is on/off/on, is that right?
On/off/on that's right Smile
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Post by andyp on Mon Jun 29, 2020 1:54 am

Ok thanks. I only checked because the existing, not original, switch is on/on. 
Is the coil switch on/on then?
Sorry for all the questions.
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Post by Purge on Tue Jun 30, 2020 2:16 pm

All the switches are on/on The four pole switch is for the original early 80s version with the active gain control, then later more common ones use a 3 pole on/on switch for the active on/off. . I have 3 if you want them, just pm me your address and I'll send them.
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Post by Westbone on Tue Jun 30, 2020 4:14 pm

Sgt. Vimes wrote:
andyp wrote:Sorry didn't see that link. That one is on/off/on, is that right?
On/off/on that's right Smile

Wrong vime again! It's on/on. It's a 2 position switch not 3.... Evil or Very Mad
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Post by andyp on Tue Jun 30, 2020 5:24 pm

Thanks for the offer Purge, but Westbone is sorting me out for switches.
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Post by Sgt. Vimes on Tue Jun 30, 2020 5:52 pm

Westbone wrote:
Sgt. Vimes wrote:
On/off/on that's right Smile

Wrong vime again! It's on/on. It's a 2 position switch not 3.... Evil or Very Mad

Of course it is, don't know what I was thinking. 

Here's the link I should have posted
https://uk.rs-online.com/mobile/p/toggle-switches/0394419/
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Post by Westbone on Thu Jul 02, 2020 5:32 pm

Thinking! that's a good idea.... Cool
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