The Rivera-Era Concert Project Part 5 : Some of the Tricky BIts
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- čas přidán 3. 04. 2021
- Spaghetti, yes, but SMART spaghetti. Ready for the owner to test.
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This series has been incredible
Wow looking nice ! :-) Awesome stuff here
can’t wait to hear it!
This is a complex amp wired messy from stock . I played out of a new one in 85 at a guitar center in orange county on my lunch hour . I was a killer amp that sang . Years later I bought a used one with the Lee Jackson mod and it did not sound nearly as good as the stock amp . I have a Lee Jackson early Metaltronix modded Marshall that really sounds great . Dan Torres was going to help me fix it but he got sick and I was never allowed to communicate with him afterwards. There is a lot of missing info in this series before and after schematic changes with explanation of component values would be pretty much necessary to understand fully what you are talking about fully
I replayed it a few times, but I'm still not sure of what you said: did you re-route all the grounding for the opto-couplers so that they were completely isolated from any audio signals? If so, do they now all share a common ground node?
I put a CTS Dpdt 500k pot in my nephews SG. It’s a nice pot!
I don’t find my Concert to be noisy any longer once I recapped the whole thing, the Mallorys were leaking and very noisy. I saw you changed out those large resistors and redesigned the filtering of the amp, I’m interested to see more about that. Did you to change the amp to a blackface adjustable bias circuit?
Did you leave V-5A in the circuit?
Hi Lyle- I picked up a pristine 67 about 5 years ago & right away replaced the power cord, death cap, , the non-"tone" caps, the dead trem roach, and the important resistors. Then we moved to a place where I can't really fire up an amp w/out pissing off neighbors. So my Super has sat for 4 years in it's road case. I'm a castrated headphone IR player, sick of the modellers and would like to be able to run my Super w/ no speakers direct to interface. I think you probably already know where I'm going with this...the damn 2 ohm output is incompatible w/ every reactive load box on the market & I don't want to risk damage by running into a 4 ohm load like some cowboys do. So I bought a ClassicTone OT to tap at 8 ohms but have been hesitant to swap it out. Are there any concerns you can thing of with doing so? I realize people who are into vintage amps are obsessed w/ the tone caps and "iron" being all stock, so I don't want to devalue it if I ever wanted to sell for some crazy reason. Is it just a remove/replace operation that's easily reversible?
So long as you are very careful and don't care about non-original solder joints it is easy to swap OTs on a SR. You could always put the original back.
Just make sure that you connect the 2 ohm tap on the new OT to the NFB resistor in the amp even if the 8 ohm tap is used for the load. So you'd want an OT with 2, 4, 8 secondary taps.
Hi, in the bias circuit, what’s the value of the electrolytic caps you put there?
100uf 100v are typical
So much for Paul Rivera being an Amp Guru?
Isn't fair to say that. We don't know what the constraints at Fender were at that time. Maybe he wanted to do really great things but they said "no, find a way to use these parts we already have - oh, and the amp can't cost us more than $200 to make."
@@PsionicAudio Fair
@@PsionicAudio Nailed it
The stuff under his own name doesn't seem to suffer from the same problems. I'm hoping that holds true personally over time, because I bought a Stage IV a while back. So far, so good, and I really like it. Heavy as a boat anchor though, but it does come with caster sockets. (But not casters 🤔)
He didn't design it apparently he was Director of Marketing at that time.