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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 11:56 am
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Cool, no worries. I'll be around all day and checking in periodically. My take on this problem is that there is a problem either in the relay switching or in the components specific to only the drive function. The clean function working normally pretty much rules out everything else. If I'm mistaken in this assumption please advise.

BTW I realize my post is not on-topic - but I had not other way to contact. I can start a new thread, and let you know its title hoping you will participate. :-) Then if you would like I can delete my posts (if possible) from this mod thread. Again thank you.


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 12:45 pm
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new thread started here viewtopic.php?f=13&t=100763


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 1:04 pm
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Ok. Back home looking at schematic.

You said the red light is on. I assume you mean the channel indicator light and not the pilot light. That would mean that at least the switch is working. If the amp is actually switching between drive and clean (which it sounds like it is from your description) it would seem that the relays are working.

So, if clean sounds normal, but drive is minimal volume the problem would appear to be with something that is specific to the drive channel. My suggestion would be to check the coax cable that runs between wj10 (hot)/wj11 and wj12 (hot)/wj13 (shield) for continuity and good solder joints. This coax provides the signal path between the output of V2A (via the 0.047 mfd coupling cap, C2) and the input to the master volume.

See the single black coax that runs over the power supply caps and cement resistors from top to bottom of the PCB.

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Last edited by bluesky636 on Sat Mar 12, 2016 1:08 pm, edited 1 time in total.

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 1:06 pm
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teslasbrother wrote:
new thread started here viewtopic.php?f=13&t=100763


Sorry. Because of issues with certain other people in this forum, I only monitor and respond to posts in my amp mod/build threads.

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 1:54 pm
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Sorry to hear that.
I have temp jumpered pins 4 and 8 and then pins 9 and 13 on K2 and have drive sound now. Although it is not as loud as it should be. It could be cross coupling in the relay contacts if the relay is bad. (shunting the signal)

I will check the coax.

red led not lamp I could have been more specific I suppose yes drive led


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 1:57 pm
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coax center conductor from point WJ12 to WJ10 is a dead short.


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 3:54 pm
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teslasbrother wrote:
Sorry to hear that.
I have temp jumpered pins 4 and 8 and then pins 9 and 13 on K2 and have drive sound now. Although it is not as loud as it should be. It could be cross coupling in the relay contacts if the relay is bad. (shunting the signal)

I will check the coax.

red led not lamp I could have been more specific I suppose yes drive led


Could be the problem. In your original post you said "the problem is it has very faint output when drive is selected and the master and drive pots are maxed". How is this any different than what you have now with the relays shorted?

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 3:55 pm
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teslasbrother wrote:
coax center conductor from point WJ12 to WJ10 is a dead short.


Shield also?

All connections soldered solid to the PCB?

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sat Mar 12, 2016 4:12 pm
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shield is a dead short and I'll reflow the solder connections.


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 4:42 am
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There is more than one relay involved in channel switching. Check to see if you are getting voltage at the relays first. If no voltage at relays, check the +/- 16 volt power supplies.

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 5:11 am
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shimmilou wrote:
There is more than one relay involved in channel switching. Check to see if you are getting voltage at the relays first. If no voltage at relays, check the +/- 16 volt power supplies.


From very first post:

teslasbrother wrote:
The + - 16v is good.


Doesn't say where measured, however.

Other posts seem to imply that the channels are switching, but that the drive channel is weak. Clean channel is normal.

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 6:05 am
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I measured the + - 16v at TP 45 and 46. I also measured TP 42 and 43 to verify +- 48v. I measured +- 16.8v and +-48v. Then I moved on to TP30, 31, 32 and 33. All OK . So the relays are being provided the switching voltage, and should be switching. I do hear some click. However I feel the problem is in the contacts of the relays. Could very well be a coil malfunctioning too.

I also as a matter of course, measured the Power Supply nodes because I found slight electrolyte leakage on the 47uf and 22uf capacitors. These voltages are very close to spec. TPs 37 thru 40. Of course it is an unregulated supply and wall voltages differ in different locations. The tube filaments are all lit with appx 6.45 vac.

I checked for drive pot signal at R8 and found like 0-2 volts variance.

Quote:
How is this any different than what you have now with the relays shorted?
originally with the drive switch in and the drive and master pots maxed it was very faint. With the relay contacts jumped as described it, the pots are adjusting volume level, and I can raise the volume until it is comparable to say 3 or 4 on the clean volume pot. I have never heard a properly functioning drive mode so I don't know exactly how loud it will get, but I'm assuming since it is a 40w amp it will get pretty loud like the clean mode.

I don't usually like throwing parts at problems, but if these relays have reliability issues then it might be a good move to replace both of them.


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 8:01 am
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Yes, the amp should be quite loud in drive mode with drive and master maxed.

You've checked all of the things one should normally look at in troubleshooting an amp, so replacing the relays at this point is the logical thing to do. I hesitated to recommend doing so right off the bat because other threads I recall about bad switching relays talked about the relays randomly switching back and forth between clean and drive on their own with no user input. Go for it.

Keeping two threads going on the same subject is kind of counter productive and usually frowned upon in most forums. You should pick one thread and stick with it.

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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 8:33 am
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Well I wasn't sure you wanted me to post this in your Mod thread. I can delete the other one.
Thanks for looking it over for me. I appreciate your time. I will have to wait on the parts now and will let you know
how this pans out. :-)


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Post subject: Re: Modifications To The Fender Blues Deluxe Reissue Amp
Posted: Sun Mar 13, 2016 8:42 am
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BTW, If this were my amp, I would definitely be tempted to use V2-B and wire it up in cathode follower config. like the bassman. I have to go back and see if you posted any sound bites or if there are some out there. Seems like a huge waste to me to not use it.


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