07-01-2018, 12:10 PM
(06-30-2018, 06:05 PM)slider313 Wrote: It's not a good idea having a power supply cap mounted right above the power tube. The heat given off by that tube will cause a problem. It also looks like that may be the original bias cap next to the 140 ohm bias resistor? If it is, it should be replaced. As for the reverb tone/decay, check the spec of the resistors in the reverb circuit and try a couple of different 6U10 tubes.
Its not right above the power tube- there are about a hundred amps with worse filter cap locations... i dont know why you think this is so bad- maybe repeating what someone else said? all electrolytics are new.
I was asking about noise and a potential lead dress problem or grounding problem- as well as reverb.... so you're telling me I should change the 6u10 to get less treble in the decay of the reverb??? I should just go buy a few 6u10's and try em and see if that helps?!? what kind of terrible advice is that? i'm sorry but I'm by no means an expert at this stuff, but you're posts are just pointless
so I had a few things going on- If you have noise in your reverberocket check out all those crazy lead wires- it has terrible lead dress and design but it can really stay pretty low noise as long as those leads are in the right place. I also had a ground loop. The amp is super quiet now and is definitely getting to where it needs to be.
I studied the schematic and I decided to try increasing the .022uf capacitor that goes to ground right after the .47uf cap (both right in front of the reverb tank on the schematic) I increased the .022uf to ,047uf and this does take some of the highs out of the reverb decay to make it not so ridiculously piercing. (i have an eminence red white and blues which is more like an older fender jensen style speaker rather than the piece of garbage that comes in a standard reverberocket- the OG speaker probably tames enough highs and upper mids to not make the trebley reverb a problem with most people.
so there's one option- something else I tried was adding another cap in parallel with the .002uf cap that comes off the echo potentiometer. I added a .003uf in parallel and it seems like it decreased the super long decay of the reverb. But it may also be cutting highs a bit... not really a bad thing either.
Anyone have any good recommendations for just taming the overall shrillness of this amp? I never put the treble knob over 40% of the way up- and I mostly crank the bass all the way with my strat or turn them both way down to try to get the mids up.
I still feel like the decay of the reverb is super intense and its super bright and ringy. I'm by no means smart enough to look at a schematic and do more than oh i think adding capacitance or lowering resistance here will decrease treble...
So if anyone has any ideas- like real ideas- id really appreciate it- even if they're guesses (just as long as they're beyond go buy a bunch of tubes and see if something changes)
Also- i've read pages and pages of terrible, terrible, terrible reviews of these CE brand and other Cap Cans. Do yourself a favor and replace cap cans with regular big boy electrolytics whenever you can. Putting them in the vicinity above a pair of tubes in a well ventilated cabinet is not a big deal. Have you ever seen a vox ac30? whoever is spreading the fear of heat in ampeg reverberockets has no idea what theyre talking about