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LNDverb question

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Offline flemmingsa

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LNDverb question
« am: 11.09.2015 22:57 »
Hi

I am building the LNDverb standalone version. I have made a test build using a stompbox chassis, so Grounding is not the best yet and a fair bit of noise is present. This Will be resolved later.

However, I have this problem:
When the reverb is connected to an amp i get a Loud and clear spring reverb boing when tapping the tank. When connecting a guitar i Can only get a very faint reverb effect if i turn mix and dwell All the way up.

The LNDverb is powered with a vpump and, for now, an atx psu is providing 12vdc.
I am using a Belton reverb tank i had lying around.

Andy idea what could cause this?

Flemming
DK

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Offline LöD

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Re: LNDverb question
« Antwort #1 am: 12.09.2015 08:32 »
Looks like you don't get signal to the pan and bypass... Maybe a short connection somewhere that bleeds your signal to ground. Check the jacks and if there is any wire touching ground where it is not supposed to do so.
Good luck
LöD
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Offline flemmingsa

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Re: LNDverb question
« Antwort #2 am: 12.09.2015 09:05 »
Thanks for the reply. I will check.

I have full dry guitar signal. It is just the effect that is very faint.

Flemming
Dk

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Offline sev

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Re: LNDverb question
« Antwort #3 am: 12.09.2015 09:53 »
Hi,
Witch exact type of reverb tank is used? Maybe it has differing impedance.
Greets
Stefan
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Offline flemmingsa

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Re: LNDverb question
« Antwort #4 am: 12.09.2015 10:15 »
Hi

The tank is: Belton BS2EB2C1B

Flemming
DK

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Offline Volka

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Re: LNDverb question
« Antwort #5 am: 12.09.2015 11:01 »
Hi Flemming,

you have the wrong reverb tank. Look at the input impedance: afaik you need a 2AB2C1B-type.

Volka

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Offline flemmingsa

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Re: LNDverb question
« Antwort #6 am: 12.09.2015 11:36 »
Oh, that makes sense... Didn't think of that...

Unfortunately, i think i fried some components in the process. So i guess i'll order the correct tank and start troubleshooting components.

Thanks.

Flemming
Dk

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Offline flemmingsa

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Re: LNDverb question
« Antwort #7 am: 13.09.2015 23:37 »
Is it likely that a tank with the wrong impedance could have damaged some components?

Flemming
DK

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Offline Athlord

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Re: LNDverb question
« Antwort #8 am: 14.09.2015 06:23 »
Hi,
if there are damaged components,
there is an other problem, but it´s not the Reverbtank.
Please post good Pictures of your Build.
regards
Jürgen
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Offline flemmingsa

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Re: LNDverb question
« Antwort #9 am: 2.01.2016 01:15 »
Hi

Getting back to this project after a long break...

I mounted everything in a chassis and started troubleshooting.
Vpump is working, but no reverb.
Voltages at LNDs are 0.3vdc, 13vdc and 0.3vdc. So here is a problem.
R14 gets very hot and has a reading of 32.7vdc

Any suggestions?

Flemming
DK

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Offline flemmingsa

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Re: LNDverb question
« Antwort #10 am: 13.01.2016 16:04 »
Anyone?

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Offline current

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Re: LNDverb question
« Antwort #11 am: 13.01.2016 16:47 »
As there is no schematic available of the LNDVerb kit, all one could do is guess. It seems that you have a short or a very low resistance ground somewhere, so R14 is dropping all of your B+ voltage. Did you make sure that no part of the circuit is touching the chassis?

Good luck,

-Thorsten

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Offline flemmingsa

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Re: LNDverb question
« Antwort #12 am: 2.02.2016 23:03 »
Tested today and R14 actually smoked!! So I guess I should try replacing that.
The question is why??
Vpump is feeding the correct voltage.

Flemming
DK

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Offline Dirk

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Re: LNDverb question
« Antwort #13 am: 3.02.2016 12:33 »
You have a short somewhere. Maybe the the IRF740 ?

Best regards, Dirk
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Offline flemmingsa

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Re: LNDverb question
« Antwort #14 am: 3.02.2016 23:52 »
Hi

- IRF740 is physically isolated from the chassis but i measure continuity between it's plate and the chassis.
- Replaced R14 and it doesn't smoke anymore. It is still hot however. Is it supposed to be hot? 200 vdc on one side and 31 vdc on the other side.
- 12 vdc on middle LND
- When guitar and amp is connected I get no sound, unless I hit the strings very hard and a faint bad sound comes through.
- When tapping the hitting the reverb tank against the table I get a faint reverb sound. Pots have no effect.

Flemming