Recent content by rdtsc

Interesting, B-string. The tonal versatility, built-in 5-string tuner, small size, and very light weight are the primary reasons the RH750 is so appealing IMO. I'd used a 300W GK class AB head for a long time, and it had enough power for most gigs but not all. I figured the RH750 would give a...

Thanks askaleftybass, I totally agree. If I wasn't working 5 part-time jobs (one of which is a start-up company taking up full-time hours for zero pay) then I'd totally have enough money to buy that gorgeous new RH750. But I'm on a shoestring budget, so have little choice but to fix what I have...

Well I didn't trust the PB800 enough to take it to yesterday's show, but I did bring it to practice today. Good thing I didn't take it before... as it worked great for 2 hours, then "crackled" and "popped" a few more times, then began exhibiting the exact same "limit" behavior. My guess at...

Ok so I went to one of the last remaining local RadioShacks for a 2k 10W or some 1k 10W resistors to get this thing tested quickly. Of course they didn't have anything like that. But I'd like to use my rig for tomorrow's gig if at all possible, so I picked what they did have, 8 pieces of 1k 1W...

As far as I can tell, no other components have been altered or removed in any way. So I'm not thinking it was modified for any particular reason, other than noise reduction. Since the +12 Float is used on the power amp board, perhaps grounding it's ground there made more sense from a noise...

Thanks for the helpful responses everyone. Was able to borrow a friend's head for the week, so no longer freaking out. I'd looked at 800W+ class D amp modules on eBay, just to see what was out there quickly. Could only find one mono unit that would accept more than +/-85V, but shipping is...

Oh boy... FretLessSince68 over on Invalid Link Removed says: Now there isn't much out there to corroborate or expand on this, but I can't find any PB800's for sale or "parts" anywhere. The LoudTech schematics are also for the 600W amp, and this one has some significant changes/additions. So...

Thanks B-string, PM sent. Have practice this Weds and Thurs, and a big show Sat... would really like to get my amp working. Contemplating buying new caps for the PSU anyways, but somehow I bet it won't help the limit issue. Was intrigued about the 3v on the MUTE line, so simulated it in...

If both rails are physically limited by the rectifier to about +/-86v open-load and muted, but the negative rail increases slowly to -101 when operating, that is ~15 more volts coming from somewhere. Perhaps it is feeding through from another voltage source? (But why not when it is "muted?")...

From practice this week, it was evident the "limit" issue was getting worse. Towards the end, the amp started cutting out mid-tune. This morning, the amp was powered on for an initial test. Definitely worse. No longer able to play after it starts working. There is some "crackle" from the...

Oops rodl2005, you're right, it is a 4-Ohm cab. My mistake. :) JimmyM, I doubt the effects loop jacks have anything to do with it, due to the following. B-string, thanks so much for the link! Very helpful. Looking over the schematics, nothing is "piped through" any switches inside jacks, so...

Hello, information about this amp head is very hard to come by; I'd greatly appreciate any help you could give. I recently traded in my very reliable 300W (GK, class AB?) head for a nice, used PB800 (class "D" of some sort) because I needed just a little bit more headroom. Had two practices and...

Little late, but better than never, right? This is the Bartolini MK1 preamp. It's also used in some Ibanez basses. What you replaced with a diode, was not a diode. It should be labeled "22" and "16V" and is a 22uF, 16v surface-mount polarized capacitor. The stripe indicates the "+" end. As you...

It's too short to shield properly. Having such noise issues already, I'm not going to chance it. The Bartolini MK1's are not a full, dual-bar humbucker. The pickups are only magnetic on their top right and bottom left. Opposite polarities, so each MK1 is essentially like the two staggered...

My 2010 SR505 hisses a little with treble boost, but that's gonna happen with any EQ. It also has pretty awful 60Hz hum. A great way to tell if it's 60Hz hum or hiss, is to try this: hold the bass up in front of you, its back flat to the floor. Does the hum go away? If so, it's either one of...