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Fender 300PS Bass Amp

#21
bikehorn said:
yeah, i'm pretty bent on building it. i think i will use a Celestion G18Q-400 if i can't find an L187F. i found some plans for a JBL W bin from 1976 or so, but it's got a ported speaker chamber and seems very vague about the length of the ports. also found plans for the 70's EV Eliminator...but it wegish more and it uses a 15" speaker as opposed to an 18". not that ihave any problem with 15s, i love them but i just want to be able to say "you want a real 18 inches?". also found a place selling a book published by Fane speakers with plans for various speakers including a W bin, but that's about it. i think i will buld the Fender. i only wish i could also fnd plans for the 301, or hell maybe even the 361.
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I have that book by Fane and it's got some good plans in it for several folded horn bass bins as well as ported reflex cabinets. It also has measured response curves for most of the cabinets, although these are all when loaded with the appropriate Fane drivers. Also some good basic data about cabinet construction, a chart to simply determine the tuning of a bass reflex cabinet with port length and area and basic data on speaker impedance.
 
#23
mroekalea said:
Hi, I have an option to buy one.

Question: Is it possible to run a 4 ohm cabinet on the 300PS?

Thanks in advance!
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Hi, saw the add too on "basgitaarforum" :p.

So you're going for it on the bidding? I'll back off then as I don't really need another amp.

You can run it at 4 ohms without danger (if it's in good shape), but it will lose some output and the sound won't be at it's very best.

With tube amps it's better to have an impendance that's too low than one that's too high. For example, the safety circuit in an ampeg V4 makes the impedance trop to 0 if there's no cab connected, since an impedance of 0 is less likely to damage anything than an infinite impedance.
 
#25
Bikehorn great review for a forgotten amp.

The progression in tube bass sound is a long story and the 300ps figures briefly but brightly.

Have owned and sold 2x 135 Bassman heads. Still would buy one back.

So what are the new tube beasts like? Thinking MarkBass 300.
 
#27
So I have a question that I hope someone who knows better than me can answer. I bought a 300ps in the fall of 2013, had an amp guru check it over, clean it up, etc. He said everything was original and there were no problems. I got it back and plugged it in, and the issue I had was a sagging, distorted bottom end that cleaned up when i turned down the lows. Only problem is that it's a bass, and the lows are the whole point of it. I plugged it into both a 4x10 and a 1x15 @ 8 ohms, where it is specified. Same problem. It seemed better with an active bass versus a passive bass, but I just can't have the distortion. Any help would be greatly appreciated.
 
#28
Well, if everything's original maybe I'd recommend changing those 40+ year old filter caps.. With an oscilloscope a tech worthy of the name should be able to track down the part of amp circuit where the distortion happens. Is it in the preamp, driver (which is a 6V6 class A into a interstage transformer) or the power amp tubes ?
But basically, changing 40 year old electrolytic caps is a good start.
 
#29
I had one for a short time and gigged it several times. It was a great amp. Got it for $99, they wanted the old junker out of their store. (laugh on them ) It was perfect. I flipped it because I really didn't need a 300 watt tuber to lug or maintain. I could bury the band with it. It would have been a dream come true back in my younger gigging with a loud band days. I sold it to some guy in England for a nice profit.
 

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