Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Pepe125 on December 10, 2020, 12:37:39 pm

Title: 100W Bass Amp
Post by: Pepe125 on December 10, 2020, 12:37:39 pm

Hi I want to build a 100w bass amplifier but I have not seen any 100w only 50w plexi as I can do to mount a 100w.
Thank you all.

Title: Re: 100W Bass Amp
Post by: sluckey on December 10, 2020, 12:42:48 pm

Look in the schematics library. There are several Fender and Marshall 100W bass amps choices.

Title: Re: 100W Bass Amp
Post by: Latole on December 10, 2020, 02:26:39 pm

One of many :

https://el34world.com/charts/Schematics/files/Marshall/Marshall_100w.pdf

Title: Re: 100W Bass Amp
Post by: 2deaf on December 10, 2020, 09:16:38 pm

I don't think that a cathode follower biased way off center is a very good idea in a bass amp.  I always tried to minimize distortion in my bass preamps and finally just eliminated them altogether.  I wound up going straight into a rack mounted compressor/limiter to a pair of Crown DC300A's and 4 JBL K140's.  It moves some air.

Title: Re: 100W Bass Amp
Post by: AmberB on December 11, 2020, 02:11:23 am

I was always quite happy with my Fender Bassman 100.  It was a mid 1970s master volume silverface amp head.  It was clean until you really pushed it.  I think Marshall made several 100 watt bass heads, but I never got the chance to use one.  From looking at the schematic, I got the impression that the Marshall preamp limited the low frequency response a bit more than the Fender preamp.
Also, Ampeg made a couple of really good 100 watt bass amp heads.

Title: Re: 100W Bass Amp
Post by: AHeck on December 11, 2020, 09:17:06 pm

I use an Ampeg V4 that I tricked out to be a bit closer to a V4B.  Sounds unreal into a Portaflex clone I built.  There are schematics for such. The other bass amp I've built is an AA165 with two extra 6L6s in parallel.  Sounds great.