Hi everyone,
I'm from Poland and it's my first post here so I ask for lenience as I am a beginner with tubes 😉
So, I decided to build my first low-power valve guitar amp. In the past I built some amps but I haven't used tubes inside them since now. I have one Russian 6P6S tube (it's electrically identical with 6V6) and it will be a base for a power amp.
As a preamp I would build this, if possible. I mean if it's possible to match the power amp on 6P6S (it's a must, so if I have to change my idea I'd rather change the preamp). I would be very grateful if someone here could help me with a schematic for this 🙂
Or, if someone has a different idea, especially better than mine I would appreciate it 😛
EDIT: Sorry I haven't mentioned it: it will be for a BASS guitar...
Greetings
I'm from Poland and it's my first post here so I ask for lenience as I am a beginner with tubes 😉
So, I decided to build my first low-power valve guitar amp. In the past I built some amps but I haven't used tubes inside them since now. I have one Russian 6P6S tube (it's electrically identical with 6V6) and it will be a base for a power amp.
As a preamp I would build this, if possible. I mean if it's possible to match the power amp on 6P6S (it's a must, so if I have to change my idea I'd rather change the preamp). I would be very grateful if someone here could help me with a schematic for this 🙂
Or, if someone has a different idea, especially better than mine I would appreciate it 😛
EDIT: Sorry I haven't mentioned it: it will be for a BASS guitar...
Greetings
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hi, sorry, but we have technical problems with your post
we are working on it
moderation
seems ok now
sorry for the delay
we are working on it
moderation
seems ok now
sorry for the delay
Tinitus plays bass, is 5 Watts enough for bedroom practice?
Your preamp does not have a feedback loop. I think SE (one output tube) with no feedback isn't a great idea for a bass amp.
Your preamp does not have a feedback loop. I think SE (one output tube) with no feedback isn't a great idea for a bass amp.
I play bass too, and 5 watts is MORE than enough for bedroom levels. One of my own amps runs an option to drop the output to 2 watts (using a 6N1P) and that's often quite loud enough...
It's a clean channel based on Fender schematic. I would like modify it to fit a bass combo. With some help of course because I'm young enough to live 😛
5W of valve power is sufficient, even more - 5W valve amp (but dedicated for guitar - I'm better guitarist than bassist) mixed with a 300-Watts cabinet is the configuration of mine for a rehearsals of our band - and it's cool, I can hear myself pretty good.
Also: the amp will be powering in the combo two 8" speakers, each has only 10 Watts, so "stronger" amp won't work for me.
5W of valve power is sufficient, even more - 5W valve amp (but dedicated for guitar - I'm better guitarist than bassist) mixed with a 300-Watts cabinet is the configuration of mine for a rehearsals of our band - and it's cool, I can hear myself pretty good.
Also: the amp will be powering in the combo two 8" speakers, each has only 10 Watts, so "stronger" amp won't work for me.
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For guitar?
For bass?
I don't follow you, it makes no sense. Anyway for clean, tight bass a single ended topology wouldn't work. So, tube preamp+SS amp or push pull.
With 300-Watts cabinet it was only a example of what a tiny amp can make.
It has sense 'cause the big cabinet (300W) is only a GUITAR cabinet, for me, for playing the guitar in my band with another head of 5-Watt power which I've already bought.
This bass combo (on this 2 speakers) will work only in home (with no use of full power) to learning because (as I said before) I'm not a bassist. Maybe in the future I'll plug something bigger but it's a far far far away now...
So using the 6P6S will be a bad idea?
It has sense 'cause the big cabinet (300W) is only a GUITAR cabinet, for me, for playing the guitar in my band with another head of 5-Watt power which I've already bought.
This bass combo (on this 2 speakers) will work only in home (with no use of full power) to learning because (as I said before) I'm not a bassist. Maybe in the future I'll plug something bigger but it's a far far far away now...
So using the 6P6S will be a bad idea?
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Bad idea is building an amp without knowing what you're doing. Read something about bass amps and bass cabinets first. Google's search engine works well.
c'mon......
what transformers do you have ,or what are in your possibilities?
I´ve done this one and I have no complains.
and it´s very simple.😎
Attachments
That one looks like a perfectly reasonable design and easy to get right, for a first project. Plus the parts are easy and cheap to source.
Single ended topologies will work fine for the posters stated use. It is just for a practice amp and for fun. So have fun.
Single ended topologies will work fine for the posters stated use. It is just for a practice amp and for fun. So have fun.
the only one impractical thing it's that you will have a little trouble with the gains ,but you said that you are going to make a tone control? if that's true you shouldn't have any problem.
Best regards
sincerely yours: Adrián.
Best regards
sincerely yours: Adrián.
Since this is a guitar amplifier thread I'm going to move it to the instruments & amplifier forum where it belongs.. That said welcome to diyAudio!I would think a 1.5K resistor on the input cathode and that a mid control is not too much value on a low power amp. But if you got the pot anyway, why not.
You've not really connected B+ to the center tap on this transformer have you? In this configuration an 8 ohm load is only reflecting 1/4 of the total primary impedance to the 6V6.. (Also only 1/4 of the primary inductance)
I have no clue if this transformer has a 20K primary as would be implied by the 5K + 5K shown in your schematic (unlikely) more likely it is a 10K primary in which case the impedance reflected to the plate of the 6V6 will be about 2.5K which is a bit low for good performance. A proper gapped 5K SE output transformer would probably provide better performance.
There is a second triode available for use with your current tube line up, should not be too hard to get the additional required gain across two stages.
its a 10k push pull transformer using only a half of it ,just in case of not having a 5k SE opt.
the other half of the 6sn7 can be used for more gain, or in case of the need of another SE module if you dont want to miss use it (a 6sn7) you can also put in the same circuit a 12au7 or a 6n1p or a 6j5 leaving all without changes.
the other half of the 6sn7 can be used for more gain, or in case of the need of another SE module if you dont want to miss use it (a 6sn7) you can also put in the same circuit a 12au7 or a 6n1p or a 6j5 leaving all without changes.
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One half of a 10K primary is not 5K but 2.5K as the impedance ratio scales as the square root of the turns ratio which is 1/2 so the impedance is 1/4 or 2.5K.. IMO you can expect better performance with a real 5K SE transformer as I previously noted.
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