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Recommend a lightweight bass amp for a retiree

The KB-12 and KB-15 some of us have recommended weigh less than that.

Hell the KB-12 only weighs 2 pounds more than the A25 Kickback combo I have and that amp is a 25 watt amp with an 8" speaker.

If weight is of primary importance I would steer someone towards RevSound. Excellent products and the pricing is great, plus you get to customize the tolex, handles and other features. Not cheap but often the same as the higher end established brands and significantly cheaper than some of the other brands people seem to love here.

His RS12T (with a tweeter) clocks in at 25 pounds.

Analogeezer
I recommend Revsound all the time but with a head we're over a grand.
 
Well, after 50+ years of playing, I might know a thing or two, too!
Don't take offense. Often times people not familiar with MarkBass filters misuse them.
Once made aware, their opinion usually changes.
I just gave them the same test I give all bass amps, by setting everything to noon. Now, yes, I know some amps have a sweet spot that require some tweaking but I use this setting to try to even the field for the sound spectrum. I thought the MarkBass amps I played were good ... but cheaper amps (Rumble, GK) sounded pretty much the same for half the cost.
 
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I'll second the GK MB112-ii (make sure it is the ii) actually 28 pounds. $180 is a GREAT price! I stalked all the used sites last fall for the 112MBP powered cab to go with mine. Now I've got 200W + another 200W when needed! It is a great rig! I played the single combo at several small gigs, and it kicks out a lot of power. When I play with a loud drummer, I set one on either side of his drum platform, and there's bass all over the place!
Well the listing price was $220 but I emailed the guy and he said strangely "could you do better than $180?" so I took that to mean he would sell it to me for $180. It has been listed for five weeks so maybe he wants the cash. However this is the 15-inch version, not the 12-incher, and I am pretty certain it is not the MB115-ii because it has a chrome control panel and back plate not the darker ones in the newer version.
 
on the weight thing..... Have you considered making/having a little dollly made for transportation? Why pick it up when you can roll it..... Buskers have some interesting setups as they need to break down fast sometimes. Might be a worthwhile rabbit hole to explore. I was helping my brother figure it out for a guitarist.... it's a very interesting rabbit hole. lots of MacGyver engineering going on
I have a nice dolly. In fact I used to have an old G-K full rig for it. The two cabs together weighed more than 150 pounds. The problem is I live on the second floor and now I don't have a place to keep it, unless in my car. I did manage to lug my 62-pound Ampeg BA-115 up those steps but it was a nightmare that I really want to avoid.
 
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I've also come across a SWR Working Pro 200-watt unit with a 15-inch speaker and a tweeter (I think). It has the power I need ... but it violates my so-called weight limit as it clocks in at 68 pounds, six pounds heavier than my BA-115. It comes with casters, too, which is a nice touch. However, like the Ampeg unit, it only has a top clasp and I really wish it had side clasps.

But the price? It would be about $175 delivered to my door. So there's that. I've read reviews here and they seem a little mixed.
 
To my ears, Rumbles don't sound like Ampegs.

Ampeg doesn't seem to be one of the early adapters of lightweight gear. Your choices are not going to be broad. So, if you want to stay with the Ampeg sound, I'd look at:

- the SVT-210AV, 200 watt head with 2x10 for 36lbs.
- The Rocket RB-115 combo, 200 watts with 1x15 at 34lbs.

To get the full 200 watts out of the SVT-210AV, you need an additional cab for 4ohms. I think this also applies to the Rocket as well. I'd figure adding another 26lbs or so to those above to get the full wattage.

If you want a Ampeg 500 watt amp, I think the lightest you can get is the PF-500 with a PF115HE cab at 56lbs.
Same for the Ampeg RB-115. Otherwise, it has only 100 watts, same as the stock RB-112, which costs about $399. Both of them have an XLR out, so you can send to the PA for extra help, if needed.
 
The RB-115 has 200 watts. The RB-112 has 100 watts.
The RB-115 has 200 watts only if you attach an 8Ω cab. That’s why I bought an RB-112: I was not going to add a cab, and the price difference was considerable. Otherwise, features are similar. And it’s pinky-lift light.

Here’s an excerpt from the user manual (I fixed the typo):

BF6BABA1-D274-4FD5-8615-BE14F90BCF79.jpeg

The RB-112 has a single 4Ω speaker; the RB-115 has a single 8Ω speaker (add another to get 4Ω and 200 watts).
 
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Oh my word, I didn't know that. But I understand the marketing. Years ago I had a Peavey combo (more than 90- pounds) and it was billed as a 300-watt amp but actually that was with an external speaker, which I never bought. Otherwise with the stock speaker it was 160 watts.

that is so good to know as that was probably my #2 choice.
Does the Rumble offer 200 watts without adding a speaker?
Well I looked at the manual and it doesn't. It offers 140 watts with the stock 8-ohm speaker but 200 IF I add another 8-ohm speaker so to draw a full 200 watts. Hmmmm (sound of me thinking)

Actually the new version of my BA-115 offers 150 watts with the 8-ohm onboard speaker, so actually that would offer a little more power than either the Rumble 200 or the RB-115 if I didn't add another speaker.
 
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Here is a pretty useful comparison of some available lightweight combos. She tests them out with a drummer going medium hard. You can hear how well they keep up (or not) with the drum kit in a room. The video also shows the control levels, although that doesn't mean much, depending on the kind of taper the pot has.

This kind of video gave me the confidence to go with the Rumble 100 for what I need it to do. My favorite sound on the video though, is the Hartke.

Note that the specs she gives are not quite accurate...like 500 watts for the Hartke. That's a peak power rating, you want to look at the RMS rating, which is 250 watts.

You may not want any of these, but maybe a bigger brother amp. Anyway, I found it useful.

Use headphones.

 
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I just gave them the same test I give all bass amps, by setting everything to noon. Now, yes, I know some amps have a sweet spot that require some tweaking but I use this setting to try to even the field for the sound spectrum. I thought the MarkBass amps I played were good ... but cheaper amps (Rumble, GK) sounded pretty much the same for half the cost.
..and that was your problem. The VLE and VPF filters should be completely counter clockwise if you're looking for a relatively flat signal. Noon is an aggressive setting for both filters.
 
Well the listing price was $220 but I emailed the guy and he said strangely "could you do better than $180?" so I took that to mean he would sell it to me for $180. It has been listed for five weeks so maybe he wants the cash. However this is the 15-inch version, not the 12-incher, and I am pretty certain it is not the MB115-ii because it has a chrome control panel and back plate not the darker ones in the newer version.

I don't know about the 115s, but V1 of the 112 is 34 pounds vs 28 pounds for the MB112-II. The 115ii is 35. Pounds.
 
..and that was your problem. The VLE and VPF filters should be completely counter clockwise if you're looking for a relatively flat signal. Noon is an aggressive setting for both filters.
You may be right but as I said I set all the controls on all of the amps the same way. Besides, I can't afford a MarkBass so any discussion is meaningless for me.