Motorola SK28M?

[century tek]

Look at post 19.

Try it out! It won't hurt anything to try.

 

[icenine]

I used my Bose Accoustimass sub-woofer for about a year with my 3 channel motorola amp...sounded great.
I ran the wires from the output tranny for the bass channel into the left speaker terminal on the AM-3 sub-woofer.
I did not use the cubes on the left and right 6BM8 channels...I used some Mission speakers and some Minimus 7s...sounded pretty good.

that sub kicks ass with my motorola amp...it provides a really nice low-end floor.

 

[activa]

Thanks, I tried the Bose system and thought the cubes sounded really harsh, and they were obviously not very sensitive, I had the amp up to 8 or 9 just for a good volume. I have a couple Min 7s I'm doing the xovers for, and I'll see what they sound like.

I may just go back to the original plan, though, of using the original speakers in open baffles. The console sounded pretty good as it was.

 

[roberttx]

What can I do with this Moto 3 channel amp if I pull it?

A little OT, but I've sometimes thought that it might be fun to make one of these into a car stereo, with a high efficiency sub in place of the bass woofer, just as a way of mocking young people.

 

[icenine]

Thanks, I tried the Bose system and thought the cubes sounded really harsh, and they were obviously not very sensitive, I had the amp up to 8 or 9 just for a good volume. I have a couple Min 7s I'm doing the xovers for, and I'll see what they sound like.

I may just go back to the original plan, though, of using the original speakers in open baffles. The console sounded pretty good as it was.

the cubes are harsh....I am assuming you are running the high/mids from the actual left and right tube channels and not through the bose sub...

try the minimus 7s

my sub is the AM3 one

 

[activa]

Icenine, I appreciate your input. I'm new to the tube/console thing, but I'm enjoying it. So far I've recapped the unit (all electrolytics, plus the non-polarized xover caps. I didn't change anything else yet. Should I do the orange drop caps? Should I get the tubes checked? Is there anything else I should do to it?

 

[smccrary]

I have an SK24M 3-channel that I have been using for close to a year. It came with the preamp and all I did was replace tubes (I don't have a tester), wire in a power switch and replace the speaker leads from the trannies.

I use some vintage full-range, single driver Realistics for L&R and wired a modern $3 Panasonic passive 10" that I picked up at Goodwill to the bass channel.

Preamp volume goes to 10. I generally get the best sound around 5 or 6 and I have never turned it up past 8. It has never given me any distortion at any level.

I plan to replace the Realistics with something two-way and to find a vintage 10"+ with enclosure to replace the Panasonic.

Good luck. I have done nothing to it cosmetically. It sits naked and glowing in my listening room.

 

[activa]

Ah, I'm going a bit overboard putting it into a nice enclosure... I used a hole saw to make walnut knobs, a piece of scrap maple veneer paneling for the front, and I'm going to use some scrap walnut for the sides. I have a friend across the street who repairs tube music amps, he's got a checker, I'll have to show it to him. I'll post pics when I'm done.

I have a pair of Energy Connoisseur C-6s I was thinking of tearing up (I got them for $50) and messing with open baffles. I will also probably try the same with the original speakers.

 

[activa]

Near completion

So I replaced a pair of 12AX7s and the amp sounds MUCH better... the other tubes were in spec, but should I just replace them anyway?

Here are some pics of the almost done amp:

 

[Wigwam Jones]

Very pretty! I can't say if you'll get a better sound from replacing the output and rectifier tubes. Some people like to do that on a routine basis to see what other tubes sound like, known as 'tube rolling' for those into the sport.

Did you recap?

 

[activa]

I recapped the power caps and the other electrolytics, but nothing else. It doesn't hum any more. I'm still not clear what other caps I should replace.

 

[activa]

I replaced the four power supply filter caps, and the two non polarized crossover caps. Are there any others that should be routinely replaced?