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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Mon Nov 05, 2012 11:35 pm
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shimmilou wrote:
If the channel switching and reverb work fine without the foot switch, the foot switch, or cable is suspect. The mute section of the amp works the same with or without the foot switch.


+1

With the footswitch plugged in, the amp's top panel controls are disengaged.

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Tue Nov 06, 2012 7:13 am
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Concur.

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 8:44 pm
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Well, I tried various footswitches and cables. All Fender brand. I notice that the amp control panel, channel indicator led, isn't powering all the way down when in clean mode. Then, (like when one of the caps charges properly it turns on or completely off) with some delay to it. In other words it functions properly but with a lag.
Still No SOUND when drive channel is selected.
Looks like its in the footswitch section of the amp. From jack to the Relays. Could it be R48 or R50. Cant solve this puppy for the life of me!!!!
Amp functions fine without footswitch!


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 9:30 pm
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R48 and R50 are in the loop (Power Amp In), and not even in the circuit unless jack is used, nothing to do with channel switching or reverb. Studying schematics......

Not to overlook anything, even the obvious, are the "Drive" and "Master" pots turned up? How about your +/- 16 volt supplies, and the previous TP readings, do all check out, when switching with foot switch?

Edit:
Forgot about the foot switch jack. Solder joints, or the jack itself? Did you change the jack? If the sleeve connection part of the jack is loose or broken (or connected to the chassis somehow), it could operate as you've described. :idea:

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Last edited by shimmilou on Wed Nov 07, 2012 9:42 pm, edited 1 time in total.

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 9:41 pm
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Yep took care of the obvious brain fart type stuff. Volumes, working cables, footswitch subs, etc..

The 16volt supplies are good with +16v and -16V.
The fact that the led doesn't discharge or charge properly makes me think caps. I must admit, with those relays and opamps to control them, I am a bit confused on the topology of how this baby switches. I am a point to point Ol school amp guy. Blended with and gratuitous helping of NEWBNESS. I've only built 10 amps to date. Circuit board amps aren't comfy for me ....... yet. So strange that the channels, when switched, yield a muted gain channel. What else is involved here?????
I have checked the TP'S and they seem pretty solid or within 20% nominal. I think it lies between TP33 ands TP34. Just trying not to chase ghosts. I've gotten a lot closer with everybody's help. Thanks.


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 9:44 pm
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Foot switch jack and connections check out? Again, if the amp works properly without the foot switch......the problem has to be in the foot switch, cable or jack (almost certainly).

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 9:48 pm
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I don't have that type of enclosed jack. Can I just use a shorting style TS jack and flying lead it?


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 9:52 pm
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Yes. Just be sure that the jack is isolated from the chassis using isolation washers, or an insulated jack.

These are input jacks, but same concept.
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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 10:43 pm
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Here's a really stupid thought: What sort of cable are you using to connect the footswitch to the amp? The specified cable is speaker cable, not instrument cable. I've not tried it in my BDRI, but if an instrument cable were used, could the capacitance of the cable be mucking up the switching circuit somehow?

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Wed Nov 07, 2012 11:29 pm
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Good thought bluesky636! It's certainly possible that it could affect the switching circuit.

I know that some amps can be affected if using an instrument cable instead of a speaker cable for the foot switch. I cut the foot switch cable (speaker wire) of my HRDlx in half and used for something else awhile back, and have been using an instrument cable (short, 3 feet) for the foot switch ever since. As far as I can tell, the switching works equally well, but the BDRI is a little different as it has reverb switching also.

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Thu Nov 08, 2012 11:35 am
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Here's where Im at.
With Footswitch plugged in. Clean channel no reverb(all functions off) I get clean channel dry without verb as expected. If i select gain channel I get no volume on channel except a quiet whisper when master vol is at max!
Here's the weird part..... If I select reverb on first and have the channel switch on the control panel of the amp pushed in (overdrive channel manually selected) I can change channels on the footswitch from clean to drive no problem. If I bypass reverb via footswitch it takes a second for the reverb to mute(slight Delay). And it reverts back to no channel selection option.

If the channel select on the amp is in the clean position (out) it reverts back to not being able to select the drive channel.

I am still getting funky voltages at some of the TP's. HUH???????????


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Thu Nov 08, 2012 11:37 am
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Sorry, the footswitch cable is the stock TS style cable they provide and tried others of the same type. It's speaker style.


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Thu Nov 08, 2012 11:45 am
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goldstache wrote:
Sorry, the footswitch cable is the stock TS style cable they provide and tried others of the same type. It's speaker style.


Ok. I'm as baffled as you are.

It might help us if you could list the current state of operations of the amp. for example:

1. All functions operate normally without the footswitch plugged in.
2. With the foot switch plugged in, channel change operates normally.
3. With the footswitch plugged in, there is no reverb when the clean channel is selected.
4. Etc.

I'm not saying that is how things are currently operating (I'm kinda lost, that's why I am asking), I'm just providing examples of what the list should look like. Once we have that list and an updated list of the voltage readings, maybe we can draw some connections between the two.

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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Thu Nov 08, 2012 12:25 pm
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here are operating conditions:
1- without footswitch amp functions properly
2- with footswitch in, reverb on/off functions properly
3- with footswitch in, reverb off, the channel function will only select clean chan. Dirty chan. is silent except for slight whisper at max master vol setting.

4-with footswitch plugged in, reverb selected on, amp will then change channels from clean to dirty but only if channel selection button on amp control panel is depressed and in dirty channel position.

I will post voltages next time I can.
Thank you all for sharing my burden!!!!


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Post subject: Re: Blues Deluxe Reissue channel switching/reverb issue
Posted: Thu Nov 08, 2012 3:28 pm
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goldstache wrote:
here are operating conditions:
1- without footswitch amp functions properly
2- with footswitch in, reverb on/off functions properly
3- with footswitch in, reverb off, the channel function will only select clean chan. Dirty chan. is silent except for slight whisper at max master vol setting.
4-with footswitch plugged in, reverb selected on, amp will then change channels from clean to dirty but only if channel selection button on amp control panel is depressed and in dirty channel position.

I will post voltages next time I can.
Thank you all for sharing my burden!!!!


Ok. You previously said that you "tried various footswitches and cables. All Fender brand." Did you actually try a second BDRI footswitch? You need to do that. "Various" footswitches don't count. If everything works with the second BDRI switch, then you know the problem is in the existing footswitch and you can quit troubleshooting the amp. If the second footswitch behaves like the original, then the problem is definitely in the amp. Please confirm.

Now, if we assume the problem is in the amp, it seems from condition 3 and 4 that the problem involves both the drive channel and the reverb (Yes, you already knew that, please bear with me.). So the question is, what circuitry in the amp is common to both channel selection, particularly drive channel selection, and reverb?

Condition 4 gives us an important clue, I think. You said that you can select the drive channel and reverb ONLY if the amp channel switch is set to drive. However, if you look at the schematic, when you plug into the footswitch jack on the amp, the circuit for the amp channel selector should be completely disconnected. When I plug my footswitch into my BDRI and activate the channel select from the footswitch, pressing the amp channel select button does absolutely nothing. However, if I select the clean channel using the footswitch, pressing the amp channel select switch will cause the amp channel select led to illuminate momentarily and then go out. The channel does not change from the clean channel selected by the footswitch. What does your amp do under those same conditions?

Based on all of this, I am thinking that the problem you are having is somewhere in the footswitch input circuit in the amp.

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Of course, I could be totally wrong. :lol: :lol: :lol:

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