• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join freeLog in
    Want zero display ads or expanded classifieds tools? Compare plans.

Non-Ampeg Tube Amps

I have been using Aguilar all tube gear since the late 1990s. I use the DB659/DB680/DB728 and the DB359 with either the GS212 or GS112 cabinets. Gear sounding tube gear. Love it!

20161103_040954[1].jpeg
 
I got 2 MESA 400+ bass amps bought new in the 90's ... got two because had one at a big show, turned it on to do sound check and it started smoking so turned off, called Mesa, got all new tubes -- you could do that in those days - had to take out 2 tubes at a time - turn on - if worked, good to go, if not, turn off, replace next 2 -- turn on, etc -- I guess they are wired in "series" and there are 12 power tubes -- learned a lesson about tube amps - still got em in my basement but haven't played for 13 years -- using GK MB800 -- whodathought?
 
  • Like
Reactions: Sartori
I build my own tube amps:

1. A Sunn 100S influenced 100W amp, based on the Weber 6S100 but with real Dynaco transformers. 2 KT88's in the power section , 100W
2. The Weber AB200, bought as a kit from Weber, slightly modified through the years for stability. 6 6550's in the power section, a EL34 as driver for the phase inverter transformer (similar to Fender 300PS, 400PS). 300W
3. A Hiwatt DR201 clone built from scratch. 4 KT88's or 6 EL34's can be used in the power section. 200W

All amps have individual bias adjustment accessible from the back panel + built in LCD Volt meter to see the idle current for each tube + plate voltage.

View attachment 981284 View attachment 981285

You've been having some fun, brother. :) I used to enjoy building amps from kits but have gotten away from it. Anyone who can clone an amp from scratch impresses me!
 
Seeing a couple of threads on here lately that are a back and forth about class d phasing out tube amps and so on....
I don't feel like getting into that can of worms but it got me thinking how I wanted to start a thread on here for discussing tube bass amps, particularly makes other than Ampeg because I think there is more than enough threads on here dedicated to SVTs V4Bs B-15s B-25s PF-50s etc... Its almost like people act like Ampeg is the end all be all tube bass amps (not saying they're not good but definitely not my cup of tea) and Im looking create a space where we can focus on the all tube monsters of the past and those of us foolish enough to use them.

So here are the rules:
1) No Ampegs, their are already hundreds of threads discussion Ampegs on here already, not saying they're bad but they already have the most exposure on this forum so lets avoid them

2) Any amp mentioned on here must atlas have a tube power section (So a musician HD-130 with a SS pre and tube power and other hybrids will be accepted)

3) Post pics, share your experiences

GREAT IDEA FOR A THREAD!


I don't own a tube amp, but there's a 90w Tuber that I get to play through now and again – I'll post a pic when I can.
 
The tube amps I use for bass are Dynacords these days. They are very wide frequency-wise, and designed as PA or general purpose amps. The G-2000 has bass boosts on both channels. I jump the "low noise" inputs together to get more control over clean output.

Peavey%20%20Dyna_zpskp2ob7wc.jpg


<subscribed>

I've read about the legendary Dynacord amplifiers, but this is the first time I've gotten a good look, thank you. :) Weren't these used as the basis for West amps?
 
  • Like
Reactions: Roxbororob
Man, I'm not gonna knock bass guitar tube amps and I'm not gonna knock nor promote solid state amps but I am going to say that most high quality solid state bass guitar amps are full frequency range of 20 hz to 20,000 hz.

How about tube amps? Especially, the old ancient bass tube amps from the 70s and older. Most of these amp have very simple and crude amp designs.

Yeah, they pull off excellent over-drive sounds but how is their fidelity level? (I used to have a Mesa 400+ and it put out the most "nasal, honky, dominate midrange sound" and I hated it!)

As long as a solid state amp is not over-driven, it puts out clean, clear, high fidelity bass sounds and all the sizzle a slapper could ever want. If we want to put some "dirt" on the sound, there are a multitude of effects pedals and some with preamp tubes. And, there are also SS amps with tubes in the preamp section for over-drive through the gain knob.

So, what is my point? Yeah! What is the fidelity range of these old ancient bass guitar tube amps that are supposed to be the "holy grail" of bass sound?
 
Last edited:
Here's a vintage Bassman 70 I just got through fixing. I bought it off eBay for a great price in "as-is / untested / tubeless" condition.
A blown resistor on one of the power tube sockets was immediately apparent but there were no other obvious issues.
In addition to that repair I wound up also replacing all the electrolytic caps, both power tube sockets, added an adjustment trimmer to the bias circuit leaving the balance pot in place. And since it came without tubes a new set was installed along with replacement shields for the preamp tubes since they were also M.I.A.
It was fun bringing this thing back from the dead. It sounds fantastic. And though I'm an "Ampeg guy", I think I'll be keeping it around for a while.

8Y0DLUF.jpg

zXvLUEh.jpg

N4paWtq.jpg

2IwzdXS.jpg
 
Man, I'm not gonna knock bass guitar tube amps and I'm not gonna knock nor promote solid state amps but I am going to say that most high quality solid state bass guitar amps are full frequency range of 20 hz to 20,000 hz.

How about tube amps? Especially, the old ancient bass tube amps from the 70s and older. Most of these amp have very simple and crude amp designs.

Yeah, they pull off excellent over-drive sounds but how is their fidelity level? (I used to have a Mesa 400+ and it put out the most "nasal, honky, dominate midrange sound" and I hated it!)

As long as a solid state amp is not over-driven, it puts out clean, clear, high fidelity bass sounds and all the sizzle a slapper could ever want. If we want to put some "dirt" on the sound, there are a multitude of effects pedals and some with preamp tubes. And, there are also SS amps with tubes in the preamp section for over-drive through the gain knob.

So, what is my point? Yeah! What is the fidelity range of these old ancient bass guitar tube amps that are supposed to be the "holy grail" of bass sound?

I used to think this way too, until I got my Ashdown CTM-15 and heard power tube distortion. I've had (and have!) a litany of boutique pedals (analog and digital) that claim to nail tube sounds. After playing through my Ashdown (and now my SVT), I realize they don't come close to getting the weight, warmth, and musicality of actual power tubes being pushed (or even clean). There are times when you just need some glass and iron!
 
Man, I'm not gonna knock bass guitar tube amps and I'm not gonna knock nor promote solid state amps but I am going to say that most high quality solid state bass guitar amps are full frequency range of 20 hz to 20,000 hz.

How about tube amps? Especially, the old ancient bass tube amps from the 70s and older. Most of these amp have very simple and crude amp designs.

Yeah, they pull off excellent over-drive sounds but how is their fidelity level? (I used to have a Mesa 400+ and it put out the most "nasal, honky, dominate midrange sound" and I hated it!)

As long as a solid state amp is not over-driven, it puts out clean, clear, high fidelity bass sounds and all the sizzle a slapper could ever want. If we want to put some "dirt" on the sound, there are a multitude of effects pedals and some with preamp tubes. And, there are also SS amps with tubes in the preamp section for over-drive through the gain knob.

So, what is my point? Yeah! What is the fidelity range of these old ancient bass guitar tube amps that are supposed to be the "holy grail" of bass sound?

The frequency response of the typical bass tube power amp is probably better than you think. For example, Sunn amplifiers used the Dynaco MkIII power amp in the 100S and 200S in the late 60's. That's normally used in hi-fi audio applications. How the designer voiced the preamp is a different matter. I prefer loud n clean myself and don't ever overdrive the preamp tubes.
 
  • Like
Reactions: Sartori
The tube amps I use for bass are Dynacords these days. They are very wide frequency-wise, and designed as PA or general purpose amps. The G-2000 has bass boosts on both channels. I jump the "low noise" inputs together to get more control over clean output.

<subscribed>

Nice!
Mine is a bit older...
 

Attachments

  • IMG_0944.JPG
    IMG_0944.JPG
    976.2 KB · Views: 90
  • IMG_0945.JPG
    IMG_0945.JPG
    552.9 KB · Views: 70
  • roxbororobrig.jpg
    roxbororobrig.jpg
    418.1 KB · Views: 82