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by mlp-mx6
Mon Sep 26, 2016 7:25 pm
Forum: Dumble Discussion
Topic: Debugging help, please - 6V6 ODS 102 (not a new amp)
Replies: 21
Views: 4710

Re: Debugging help, please - 6V6 ODS 102 (not a new amp)

Jelle,

Thanks. Yeah, that's what I think I may be down to. I'll try to use my scope to locate the failure.

Regards,
Michael
by mlp-mx6
Mon Sep 26, 2016 12:20 pm
Forum: Dumble Discussion
Topic: Debugging help, please - 6V6 ODS 102 (not a new amp)
Replies: 21
Views: 4710

Re: Debugging help, please - 6V6 ODS 102 (not a new amp)

I'll keep you posted as I continue (sporadically) to research this. Thanks, folks.
by mlp-mx6
Sun Sep 25, 2016 2:29 am
Forum: Dumble Discussion
Topic: Debugging help, please - 6V6 ODS 102 (not a new amp)
Replies: 21
Views: 4710

Re: Debugging help, please - 6V6 ODS 102 (not a new amp)

I should've said - I've replaced each preamp tube individually, and the power tubes as a pair. It doesn't seem to be the tubes.

Here's pics. It's crowded in there, I know.
by mlp-mx6
Sat Sep 24, 2016 11:34 pm
Forum: Dumble Discussion
Topic: Debugging help, please - 6V6 ODS 102 (not a new amp)
Replies: 21
Views: 4710

Debugging help, please - 6V6 ODS 102 (not a new amp)

This is an amp that has been working fine for several years. It's a 102-circuit with 6V6s and a built-in D'lator. Suddenly it has developed a strange crackling/popping sound that I cannot trace. Audio file is the clean channel, up pretty loud. There's nothing obvious in looking at the amp - no burnt...
by mlp-mx6
Thu Sep 15, 2016 7:14 pm
Forum: Dumble Discussion
Topic: Has anyone tried the Roland Blues Cube with the Robben Ford?
Replies: 31
Views: 5458

Re: Has anyone tried the Roland Blues Cube with the Robben Ford?

Just to hear it directly from the source: Robben discusses his setup, and why he has gone to a pedalboard. Spoiler: He got tired of the Dumbleator requirement to use other effects.

https://soundcloud.com/guitar-player-ma ... obben-ford
by mlp-mx6
Sun Sep 11, 2016 6:47 pm
Forum: Dumble Discussion
Topic: Has anyone tried the Roland Blues Cube with the Robben Ford?
Replies: 31
Views: 5458

Re: Has anyone tried the Roland Blues Cube with the Robben Ford?

You are comparing a studio-recorded tone to a live tone of unknown quality. Not a fair comparison at all. That studio track was probably from before the Tele for one thing. Well, those Music City Roots recordings are professionally done. We already knew that one tone from from the 80's/90's and the...
by mlp-mx6
Fri Sep 09, 2016 11:42 pm
Forum: Dumble Discussion
Topic: Has anyone tried the Roland Blues Cube with the Robben Ford?
Replies: 31
Views: 5458

Re: Has anyone tried the Roland Blues Cube with the Robben Ford?

A bit of all of the above. How about this: 1. 80s vintage tone, amp's OD, Dumbleator, full rack https://www.youtube.com/watch?v=5D-ebXc76W4 2. This year's tone, pedalboard-based sound: https://www.youtube.com/watch?v=EIhDx5XKRXg G. I've wondered for years about long-term high-end hearing loss havin...
by mlp-mx6
Wed Sep 07, 2016 1:30 pm
Forum: Dumble Discussion
Topic: Has anyone tried the Roland Blues Cube with the Robben Ford?
Replies: 31
Views: 5458

Re: Has anyone tried the Roland Blues Cube with the Robben Ford?

I think everyone makes a valid point here. The interesting thing is, the last few times I have seen RF playing through his 102, it doesn't sound like RF playing through his 102. I am not making this up... "The golden tone era" seems to be long gone, and I would suspect by RF's choice. Gil I'm curio...
by mlp-mx6
Sat Aug 06, 2016 9:12 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: Please help me diagnose this Deluxe Reverb

The board is a bit warped, but that 47ohm resistor is still solid. This *is* a Silverface. Pot codes show 1968. The tube chart says AB763, but it also says 5U4 rectifier, and it had the nasty ceramic caps on the power tubes (I just clipped those), and it has the chocolate caps in the preamp - clearl...
by mlp-mx6
Sat Aug 06, 2016 9:08 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: M

Pots are tight. Input jacks are good too. I did extend that wire, but there was already a solder nut on the PT screw, so I ran the wire there. Good to go. Thanks again. Take this wire , extend it , crimp a ring on it and bolt it down to one of the PT mounting bolts and make sure that bolt is tight ,...
by mlp-mx6
Sat Aug 06, 2016 12:32 am
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: Please help me diagnose this Deluxe Reverb

OK, I may be about to declare victory. Taking you folks' advice, I started by checking ground connections. It looked like one of the brass plate grounds was supposed to have been soldered to the chassis also, but this did not look secure to me. So I fired up my big iron and re-flowed it. Now it work...
by mlp-mx6
Fri Aug 05, 2016 3:50 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: Please help me diagnose this Deluxe Reverb

Firestorm wrote:The fact that the B+ goes UP (and fluctuates) implies that the power supply is losing its load intermittently..
I had the same thought. Some intermittent connection is removing the load. I'll check those things as soon as I can. Thank you.
by mlp-mx6
Thu Aug 04, 2016 7:59 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: M

Stevem wrote:Is the bias voltage on pin 5 of each output tube stable when the amp is acting up?
Good question. I'll check it tomorrow. (band has a gig tonight)

Thanks!
by mlp-mx6
Thu Aug 04, 2016 12:30 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: D

Did the amp do this before the new filters got installed? Yes. New filters made no diff. Where any new / different tubes installed when this issue kicked in? Do both channels do that? No new tubes. Yes on both channels, which indicates to me that it's a power supply problem. That's why I did the fi...
by mlp-mx6
Thu Aug 04, 2016 12:24 pm
Forum: Fender Discussion
Topic: Please help me diagnose this Deluxe Reverb
Replies: 13
Views: 2805

Re: Please help me diagnose this Deluxe Reverb

First thought is its an issue with the tremolo section. Does it make a difference if you have the tremolo switched on or off? Or with a change in the controls (speed,intensity)? Trem makes no diff. You might try pulling the tremolo tube out and see if that makes any difference. If you're not sure w...