elbinster wrote:Ok, after bragging to my friends about how awesome tube amps were, one asked me to build him a head for a bass cabinet he has, and I'm starting my research into what I'll need to do........
My guess is that finding iron for a 300W bass amp is going to be the most annoying part.
dhuebert wrote:My Hammertone BFA makes 156 watts RMS into 5 ohms and uses Hammond transformers and 4 KT88s. The KT88s are a little small for this application and I would go for KT90s or KT100s if I built another of these.
Don
ChrisAlbertson wrote:You can build a 100W amp and then if more power is required build more amps. Each amp powers it's own set of speaker in the cab
dhuebert wrote:I was looking at the schematics and there is a change to the preamplifier: I replaced the input resistor and cap with a 10 meg resistor. This was done to make it compatible with piezo pick-ups on acoustic bases, it works nicely.
elbinster wrote:ChrisAlbertson wrote:You can build a 100W amp and then if more power is required build more amps. Each amp powers it's own set of speaker in the cab
This seems like a nice and sane idea to me. I saw that Hammond makes the 1650W (280W), which, at $282 +28lb of shipping is where I started to say 'this is ridiculous'....
ChrisAlbertson wrote:BTW the best place to buy Hammond parts is STF Electronics. For example they have the 1650W for $227 and free shipping.
Hotsauce wrote:Why do you need that much power?
Can't you use a lower power amp and mic the cab to the PA system?
John C.
elbinster wrote:I've found a few schematics, and think a sextet of 6550 or kt88 would be more than enough (though not very likely to hit 300W)
EWBrown wrote:The Karlson design speaker cabs are very efficient at lower frequencies, and if anything, they seem to extend the speaker's lower freq response.
/ed B
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