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Ampeg PF350/500 Part VI

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#841
seamonkey said:
Look around
Class-d amps/modules list PSRR's of 60db to 85db or better.
Click to expand...

Too simple, as usual.

As an exercise, I will ask you to tell me why this is the case, and also whether or not these conditions hold when the amp is overdriven. How about highly overdriven to the point of overwhelming any power management the amp has?

Hint: Most class D amps are a full bridge. What happens when the bridge unbalances?
 
#842
okcrum said:
Hint: Most class D amps are a full bridge. What happens when the bridge unbalances?
Click to expand...

That may be the case with the ICEpower modules but the PF series is not bridged.

Edit:
The reason the total capacitance in the SMPS filter is lower is it needs to filter out a much higher frequency than the typical 120hz in a full-wave rectified linear PSU.
 
#843
Just e-mailed my local music store about possibly upgrading from my 3 month old PF-350 to the PF-500. They don't carry them in stock as far as I know so they would have to order one. What do you guys think would be a fair amount of extra cash I'd have to pay to make things square up? I should have just ordered the 500 to begin with but I wasn't even sure what cab I was going to be using at the time.
 
#846
jaxstarke said:
Just e-mailed my local music store about possibly upgrading from my 3 month old PF-350 to the PF-500. They don't carry them in stock as far as I know so they would have to order one. What do you guys think would be a fair amount of extra cash I'd have to pay to make things square up? I should have just ordered the 500 to begin with but I wasn't even sure what cab I was going to be using at the time.
Click to expand...

Are you going to run that with an 8 ohm cabinet? If so you're probably not going to get a huge increase in volume by going to the 500 over the 350. The extra tonal options on the 500 will help though.
 
#847
4 Ohm, 500 w cab. The PF 500 would work perfectly with it but like I said, I wasn't sure at the time what cab I would be getting so I opted for the PF 350. Sounds good and whatnot it's just I'd like to have a few more tonal options and features that the 350 doesn't have.
So anyway, what should I be looking at spending after trade in, an extra $100, $150, $125, $200?
 
#848
Yeah, I'm not thinking a big diff from the 350 to 500...but, the 800 should be noticeable for the headroom factor. You're probably gonna have to shell out $200 to go to the $500 (how much are they gonna give you on the 350?).

So...if you're gonna plunk down cash, my take would be to get the big daddy. I have the 500 and it has mostly been loud enough (I did kinda run out of headroom on my last gig using my Genz 212 neox). So that is why I say that.

I guess though if you are just using one cab you aren't gonna see a huge difference...maybe trade that single 4 ohm for two 8 ohm cabs? Or go for a 4 ohm with more speakers?

Good luck either way!
 
#849
Haven't heard back from the store yet. At this point it probably looks like I won't. I have no idea what they would give me for trade-in. Just wish I had gone with the PF-500 to begin with. Oh well, life goes on. Still enjoy the heck out of the PF-350. Wish I had tried Ampeg YEARS ago instead of buying everything that wasn't.
 
#851
jaxstarke said:
Haven't heard back from the store yet. At this point it probably looks like I won't. I have no idea what they would give more for trade-in. Just wish I had gone with the PF-500 to begin with. Oh well, life goes on. Still enjoy the heck out of the PF-350. Wish I had tried Ampeg YEARS ago instead of buying everything that wasn't.
Click to expand...
If I had a dollar for every time I heard that...

:D

I love my PF350 and feel no need to upgrade, quite honestly, and if I were, I'd REALLY upgrade and go PF800 or 7 Pro.
 
#852
I'm dumb. Having been a tube amp user all my life and only having little ss amps for practice leads me to this dumb question.:

The limiter circuit. It I have it engaged and its flickering on quite a lot and I flick it off I notice I like the sound better. Gritty and, well, unlimited. The note blooms immediately after attack instead of being whacked down by the limiter or so I perceive.

Am I in imminent danger of frying the head? If so, why even have the option to turn it off?

I only notice this when in a loud situation through a single 8ohm cab. With two cabs it's not a problem because its plenty loud. As I said, I have never owned a head with a limiter and the manual isn't very helpful and I'm not an engineer.
 
#853
jaxstarke said:
Just e-mailed my local music store about possibly upgrading from my 3 month old PF-350 to the PF-500. They don't carry them in stock as far as I know so they would have to order one. What do you guys think would be a fair amount of extra cash I'd have to pay to make things square up? I should have just ordered the 500 to begin with but I wasn't even sure what cab I was going to be using at the time.
Click to expand...

I love my PF-500, but if the 800 had been available when I bought the 500, I would have gone with it.

I don't need extreme volume, but it is good to have the extra headroom.

If you have the cash, get PF-800.
 
#854
P Town said:
I love my PF-500, but if the 800 had been available when I bought the 500, I would have gone with it.

I don't need extreme volume, but it is good to have the extra headroom.

If you have the cash, get PF-800.
Click to expand...

+1. I bring my PF-500 into power amp distortion all the time. It's not significantly more power with the PF-800 but you can keep it cleaner and save your speakers from square waves. The PF-500 seems to hit distortion very easily. Buy the extra power..

Also- I would recommend these amps for 8ohm only. Anytime I've had cut outs, the load was 4 ohms. Coincidence? I think not.
 
#856
Can't decide anymore whether the 4 or 7 Pro is my favorite hybrid Ampeg. 7 Pro's great and it used to be my clear favorite, but I've used that 4 Pro on a couple gigs recently, and even on low volume gigs like I do, it just hits like a hammer.
 
#857
My PF500 is going back into the shop again. I took it to audition for a second group, and as soon as I flipped the power switch on, it went poof --- into fault mode to stay. They were able to plug my bass straight into their board and just ran me back through monitors, but it sucked not having my rig and my sound, even though they were totally cool with it and understanding. This is the third time I've had this happen with the PF, and I don't run it any different than any other amp. We'll see what the warranty shop says this time. I don't doubt Ampeg will cover it and fix it - but I'd like to find out what is causing this to happen for the third time.
 
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