FIXED-Volume only on 0D channel but nothing on clean channel

[jcsifu]

I apologize because I wrote the idea out incorrectly in my previous post.

Jumper from V1b to the LTPI. (I stated V2 incorrectly in the previous description).

The schematic and layout drawings should be correct and show the V1b to LTPI jumper.

With respect, 10thtx

Ok, gotcha. I was looking at the diagram, so it would have been fine anyways. Thanks for the follow up.

[jcsifu]

I just got through playing on the jumped clean channel and it is beautiful. So you were right bro, my failure is in my switching.

I observed the following:
I had left the footswitch on OD and the sound was there but was nasty and sputtered. Then I switched the footswitch to Clean and it was very awesome sounding.

The footswitch functions worked as far as I can tell. Because when I switched channels the OD was taken out, I would say that proves it is normal. When I switched PAB in, there was the usual increase in volume so that proves normal as well.

Here's a thought;
What if I were to take the switches out of the equation, hardwired to require the footswitch? I always use the footswitch anyway. I could make a switch "plug" to insert in the pedal jack if I ever need that function.
This would free up 2 switch locations for NF switch for V1b and for a snubber selector for V2.
I think that would be a good option for me, do you know anyone who's tried that and commented? I searched the forum but I didn't find any post on this.

[10thTx]

I don't build Dumble clones (or any other type of clones). I do build D-inspired amps so I am obviously not a purist when it comes to cloning.

IF you don't need the switches, I wouldn't hesitate to change them into something that I would use.

Having said that ................... IF you want to fix your switching problem:
Look at reply #24 on this thread on relay switching to see if this gives you some insight into how to fix your switching problem.

http://el34world.com/Forum/index.php?topic=14348.0

Glad you verified the clean is working fine.

With respect, 10thtx

[jcsifu]

Still working through this. I read that thread you linked, thanks. I'm going to spend some time looking at switch configs and try to see why mine is behaving differently.

I think I still might just bypass the switches and see if that fixes it. This would at least let me know nothing from the low plate conversion is suspect although I have checked every connection I believe. I have a gig coming up that I wanted to use this 2x12 combo for.

I'll post back when I get it figured out.

[jcsifu]

I am lost here as I have checked everything as prescribed and I have bypassed the jacks to see what that would do, yet there is still no clean channel unless I jumper it like earlier. The PAB works from footswitch and when I press channel change on footswitch it either goes quiet(clean supposed to be) or OD(working fine).

Could it be that my relay is malfunctioning?

[amplifiednation]

It doesn't sound like your OD relay is wired right.

[jcsifu]

It doesn't sound like your OD relay is wired right.

I know, right? It has not been changed from when it was working though. I have tested continuity on all relay involved connections as well.

I'm not sure if this would help figure this out, but when I jumped the clean channel to the master volume and had the footswitch on OD, it would give a splatty sound to the notes. Once switched to clean (still being jumped, for clarification here) I only heard a great clean tone.

I cannot understand why this is true...my amp is possessed!

[amplifiednation]

What relay boards did you use? Does the amp have a clean master or just a volume control? Post a couple pics of the OD relay. If you are using the drawings on this site as reference, they aren't really that accurate with most of the boards available having 6 contacts

[jcsifu]

I should state that I did not assemble this amp, just did a little re-work and snubber caps and a now removed V1b nfb cap switch. This was assembled by Ceriatone.

Would there be any way that a relay could fail and produce this result?

[jcsifu]

Here are basic pics of the relay board

[10thTx]

Would there be any way that a relay could fail and produce this result?

You can check the relay with a voltmeter to see IF it is switching or not.
Easy to do. Just check for continuity.

IF the relay is working OK, then I think you still have it wired incorrectly.

PLEASE keep in mind this "new" problem with clean not working may have nothing to do with the minor wiring changes you made. Could be a coincidence. Stuff like that happens sometimes. You can change a flat tire on a car and then have the water pump on the engine go out.

with respect, 10thtx

[jcsifu]

You can check the relay with a voltmeter to see IF it is switching or not.
Easy to do. Just check for continuity.


with respect, 10thtx

I'm not experienced with relays, how would I do this?

[jcsifu]

IF the relay is working OK, then I think you still have it wired incorrectly.

PLEASE keep in mind this "new" problem with clean not working may have nothing to do with the minor wiring changes you made. Could be a coincidence. Stuff like that happens sometimes. You can change a flat tire on a car and then have the water pump on the engine go out.

with respect, 10thtx

True...I did not consider that. It would be a hell of a coincidence as this guy has been put through paces for many gigs now, but as few options as it seems there are, I suppose that's possible. It just seems like something would have surfaced earlier if it was a wrong wiring issue. Once I know how to check the relay I'll do it and post.

[amplifiednation]

You can check the relay with a voltmeter to see IF it is switching or not.
Easy to do. Just check for continuity.


with respect, 10thtx

I'm not experienced with relays, how would I do this?

Post a pic of the relay...we will be able to sell if it's wired right

Ha...edit...I see you did, I will look

[amplifiednation]

I think you are missing a jumper from the Clean out to the normally closed eyelet on the other pole of the switch. This would break the connection for the clean channel when the relay wasn't engaged, although it would still connect with OD when engaged

Use the diagram on the bottom...