No problem ! Thanks for the reply. 🙂Sorry for late answer.
Which is I don´t know. I have them in stock but never got around to "play" with them.
@Koifarm has a lot of experience though 😉
That doesn't surprise me if you were using a 12V power supply.@b_force
I tried, initially, to use a 7806 for the heaters but that thing got really, really hot. Then I had the idea of placing an external power transistor to help the regulator, but never got the balance between the two right. The problem is that, if I use a 12V power supply, I will have 6V drop across the 7806 and both valves are pulling 700mA or so. Finally, I gave up and used a buck, which runs cool. 😎
That is (12-6)*0.7=4.2W of power dissipation.
With a buck converter that is more around 630mW or so.
Around 80-90% and these days 500kHz - 1Mhz is also not special anymore.
So very easy to get rid of the noise as well 🙂
So very easy to get rid of the noise as well 🙂
They tend to be microphonic.6cw4 , a nuvistor, is used in hifi. Som other ones will also work well.
With 6n16b as voltage stage and fase shifter, 6n30p parallell in PP you can make a 10watt ampHi,
I have been doing some guitar amps with submiature valves.
But are there subminiature valves that can be used in HI-FI
https://www.diyaudio.com/community/threads/small-tube-amp-based-on-6n6p.197840/page-2
I only think they will get pretty toasty?6n30p parallell in PP you can make a 10watt amp
That's the reason why I went to like a 6AK6/EL91/EL95.
They are still tiny, and also only use 150/200mA heater current
The 6N30P has a filament current of 700mA.😱With 6n16b as voltage stage and fase shifter, 6n30p parallell in PP you can make a 10watt amp
https://www.diyaudio.com/community/threads/small-tube-amp-based-on-6n6p.197840/page-2
The one I am using, the 6P30B-R has more power and consumes less, but even that way it heats a lot. It's good for the winter. 😎
@b_force
By the way, after what you said regarding the 6021, I had a look to the curves and said holly crap, I really messed up.
Went to ebay again and the seller exchanged that one for a 6AK6. UUUuufff (he didn't have EL91/95).
I will try it, as you suggested, as a replacement for the 6P30B-R which consumes more than 400mA of current.
By the way, after what you said regarding the 6021, I had a look to the curves and said holly crap, I really messed up.
Went to ebay again and the seller exchanged that one for a 6AK6. UUUuufff (he didn't have EL91/95).
I will try it, as you suggested, as a replacement for the 6P30B-R which consumes more than 400mA of current.
In the UK, ECL80 are also easier to get I think?
Mullard even made some amplifiers with it.
It's basically a EL91 with a little triode.
The triode is not the most linear of all tubes, but fun to play with.
Also not subminiature anymore 😇
Mullard even made some amplifiers with it.
It's basically a EL91 with a little triode.
The triode is not the most linear of all tubes, but fun to play with.
Also not subminiature anymore 😇
This is not a datasheet but a nice summary of the specs of some subminiature tubes.
http://www.tubeclinic.com/RuSubMinTubes-Table.pdf
http://www.tubeclinic.com/RuSubMinTubes-Table.pdf
Although not very efficient in sense of heating/filament current, you can always cascode two triodes to get a lof more gain of course 🙂
My take on subminiature tube preamp. Differential, high gain, high current, low distortion. I'm also planning to use SMPS for the heaters one of these days, I already have the converters.
Attachments
No, I haven't measured each stage separately. It's the complete preamp input to output. Otoh, it can be connected as a SE but it will do the conversion to balanced anyway.
No volume control, no input selector in any of my preamps. 🙂 My entire music library is digital and I use the digital volume control.If you call this a preamp where is the volume control ? Thanks
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