Bassman 300 Pro, Ohms...

[flatwound62p]

Have you tried a less efficient cab? I run a similar Super Bassman into a single Fender Neo 1x15 cab, I can run the master volume at a reasonable level and get the amp cooking nicely before it gets massively loud. Pretty sure I wouldn’t be able to do that if I ran through a fridge. It would knock my head off my shoulders

 

[rufus.K]

If you want breakup, get a Rusty Box from Tronographic and be done with it.

Have you tried a less efficient cab? I run a similar Super Bassman into a single Fender Neo 1x15 cab, I can run the master volume at a reasonable level and get the amp cooking nicely before it gets massively loud. Pretty sure I wouldn’t be able to do that if I ran through a fridge. It would knock my head off my shoulders

This also makes sense to me

 

[Count Bassie]

THATS funny!

Have you tried a less efficient cab? I run a similar Super Bassman into a single Fender Neo 1x15 cab, I can run the master volume at a reasonable level and get the amp cooking nicely before it gets massively loud. Pretty sure I wouldn’t be able to do that if I ran through a fridge. It would knock my head off my shoulders

If you want breakup, get a Rusty Box from Tronographic and be done with it.


This also makes sense to me

These are interesting ideas.

 

[JohnnyChatter]

That’s a great head! I’ve owned several and the super bassman also which I don’t like as much. So first that amp does not have a strong tolerance for mix impedance. Next tube amps don’t change wattage with how many ohms they are running. It’s 300 watts at all three taps. And that amp is a loud clean machine. If you crank the master all the way up and use the gain as the volume it will really thump at you. The distortion on that amp is useable and actually really good but you just have to barely mix it in…. If you crank it it turns into a box of bees. Which some people love but that nice crisp overdriven sound you can get my just feathering it in. Shoot…. I have had 6 throughout my life and sold the last one 2 years ago and now I’m kinda wanting one again. Must resist!

 

[Freight Train]

I got one more...
This thing is set up with a modification for KT-120s. It's designed for KT-88s or 6550s. Any advantage to returning to 6550s? It wouldn't require any reversal of the mod.
I'm getting the idea that this amp is just going to do its clean thing, whatever power tubes are in it.
I'll go read the Tube Wizard next!

No matter what power tubes you use, in order for the power tubes to distort in a 300 Pro, you're going to be melting faces on any but theater stages and bigger. Once I figured out that the sound I was chasing was power tubes on the edge of, and sometimes into, power tube breakup, I realized low powered tube amps would be my answer since I could get there at reasonable volumes, and any large, and most medium stages will have FOH support and monitors. Depending on size of stage, I have a Bassman 100T with the 410 Neo cab, which is switchable for 25 or 100 watts, and a 50 watt Ampeg PF-50T that I can pair with one or two PF-115HE cabs depending how hard I want the amp to work. I've gigged with the Fender rig for 11 years and the Ampeg for over 5 and I've learned to "play" both those rigs to get right at the sweet spot where the power tubes start singing with all those harmonics, and that good rich self-compressing is happening. If you're wanting to play a 300 watt tube amp like that, you better be outside or at least on a very large stage. BTW my band plays dive bars to festival stages and I've never been underpowered. I carry a 250 watt micro head in my gig bag just in case, but it's never seen the light of day.

 

[primusfan1989]

I wouldn't run that amp with an incorrect impedance, if we were talking about an 60s-70s Bassman Id say go for it, the transformers were pretty robust and will handle the mismatch. I would not have the same expectation on any piece of fender equipment post 1980s.

 

[jastacey]

I had that p several years ago, did the preamp tube rolling in it, and found the inverter tube, that was stock, was the best choice, and found the second tube, which was for the overdrive circuit, sounded pretty good with a Sylvania 5751, the crunch was somewhat differant, the best tone was with the overdrive channel blended into the clean, along with the EQ channel engaged and set to the acoustics of the room & cabinet, the p does get kinda warm, so a little clamp-on 4-6" fan helps with that, setting the bias was pretty easy, it has a little cover, over the test ports, the only other thing about that amp, the tubes are fused in 3 pairs, and the fuses are different, never blew output fuses, and really never did tune rolling on the output tubes, as the stock ones performed well, for me .,. I currently have the Super Bassman 300, and the tone is very differant than the Bassman 300 Pro.