Hi,
I built an amp with TDA2050 (running with 18 v) for a stick bass two strings, and I'm looking for a preamp, maybe with valve at low voltage and a very simple schematic..
I specify I'm not a musician, it's just for fun !!
Than's for advices..
Phil.
I built an amp with TDA2050 (running with 18 v) for a stick bass two strings, and I'm looking for a preamp, maybe with valve at low voltage and a very simple schematic..
I specify I'm not a musician, it's just for fun !!
Than's for advices..
Phil.
An externally hosted image should be here but it was not working when we last tested it.
Stereo Tone Control 3 Way Audio Preamplifier Kit Bass Mid Treble Analog | eBay
I bought 2 of these, 1 for my stereo rig and the other I will use for my bass.
Have not tried them yet. I have the stereo one almost done, just need to wire the power wires in, will do that today while the blizzard rolls in 🙂
Tone is at 60hz, 1khz and 8khz so should be sweet for a bass.
I bought 2 of these, 1 for my stereo rig and the other I will use for my bass.
Have not tried them yet. I have the stereo one almost done, just need to wire the power wires in, will do that today while the blizzard rolls in 🙂
Tone is at 60hz, 1khz and 8khz so should be sweet for a bass.
Thank's, but I forgot to mention that 18 volts is DC..
And I would not make another power supply, but what kind of valve tube is operable with only 18 volts DC ?
Or what transistor as a "tube sounding" for preamp ?
Phil.
My diy bass :
Do not laugh !! Ugly, but it's work (for me)..
And I would not make another power supply, but what kind of valve tube is operable with only 18 volts DC ?
Or what transistor as a "tube sounding" for preamp ?
Phil.
My diy bass :
An externally hosted image should be here but it was not working when we last tested it.
Do not laugh !! Ugly, but it's work (for me)..
The Alembic F2-B schematic, which is based on the Fender bassman, has become somewhat of a favorite for a relatively simple yet very effective DIY bass project. Google will provide loads of schematics. It utilizes the famous 12AX7 (ECC83), has a classic fender type 3-band tone control, and sounds good. If the gain is too much, you can lose the cathode bypass caps. And the bright-switch is offcourse optional (I don't like it).
Oops, I missed the low voltage part. IME tubes like high voltages. But jazbo8's suggested link to Merlin's paper is an excellent read.
Hi,
Thank's all..
ECC82 is easy to found, and schematic are very simple.
I study Merlin Blencowe article, and see what I can build.
Just last question, I discover J201 fet transistor, what difference at "listening" with ECC82 ?
Thank's.
Phil.
Thank's all..
ECC82 is easy to found, and schematic are very simple.
I study Merlin Blencowe article, and see what I can build.
Just last question, I discover J201 fet transistor, what difference at "listening" with ECC82 ?
Thank's.
Phil.
That's impossible to answer. Tubes are more non-linear than fets, distort in a different way and have usually higher (plate/drain) impedances to name but a few differences. How this translates to an audible signature is completely dependent on the surrounding components and design topology.
If you don't want to buy a transformer with a high voltage secondary you might just take a small one with the same secondary voltage as the one that you are already using and connect it secondary-to-secondary with your existing one (given that the existing one is beefy enough). Such that the new one is acting as a step-up transformer. I have done this once for a DIY bass preamp (which is mainly solid state with a valve front-end) as well .
The other thing is using voltage multiplier circuit.
IMO I wouldn't use a valve at 18 volts.
Regards
Charles
The other thing is using voltage multiplier circuit.
IMO I wouldn't use a valve at 18 volts.
Regards
Charles
Hi Charles,
Thank's for the trick, I did not know this !
After reflection I wonder if a valve with 18 v was a good way for me ?
I have two bass guitar, one is active 4 strings, it's work well with my diy amp.
The other, diy 2 strings use a driver as mic :
On line input of hifi amp, it's work. But that the gain will be sufficient with a valve powered by 18 volts...
1 : build another box for valve with new power supply and bypass for active bass
2 : use a transistor in the same box with same power supply
In actual box amp, I can not add a new transformer !
It will be full with a simple ECC82..
Phil.
Thank's for the trick, I did not know this !
After reflection I wonder if a valve with 18 v was a good way for me ?
I have two bass guitar, one is active 4 strings, it's work well with my diy amp.
The other, diy 2 strings use a driver as mic :
An externally hosted image should be here but it was not working when we last tested it.
On line input of hifi amp, it's work. But that the gain will be sufficient with a valve powered by 18 volts...
1 : build another box for valve with new power supply and bypass for active bass
2 : use a transistor in the same box with same power supply
In actual box amp, I can not add a new transformer !
It will be full with a simple ECC82..
Phil.
The Real McTube II
low voltage, may add more distortion then you like but he explains that.
12 volts
low voltage, may add more distortion then you like but he explains that.
12 volts
No, the MacTube does not run off 12V, it uses back-to-back "wall-wart" transformers to get HV as mentioned above. If you really want to use very low voltage with tubes, use the type that was designed for such application - the space charge tubes. 😉
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